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<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>ListViewDataSource · React Native</title><meta name="viewport" content="width=device-width"/><meta name="generator" content="Docusaurus"/><meta name="description" content="Provides efficient data processing and access to the `ListView` component. A `ListViewDataSource` is created with functions for extracting data from the input blob, and comparing elements (with default implementations for convenience). The input blob can be as flat as an array of strings, or an object with rows nested inside section objects."/><meta name="docsearch:version" content="0.63"/><meta name="docsearch:language" content="en"/><meta property="og:title" content="ListViewDataSource · React Native"/><meta property="og:type" content="website"/><meta property="og:url" content="https://reactnative.dev/"/><meta property="og:description" content="Provides efficient data processing and access to the `ListView` component. A `ListViewDataSource` is created with functions for extracting data from the input blob, and comparing elements (with default implementations for convenience). The input blob can be as flat as an array of strings, or an object with rows nested inside section objects."/><meta property="og:image" content="https://reactnative.dev/img/logo-og.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://reactnative.dev/img/logo-og.png"/><link rel="shortcut icon" href="/img/favicon.ico"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/solarized-dark.min.css"/><link rel="alternate" type="application/atom+xml" href="https://reactnative.dev/blog/atom.xml" title="React Native Blog ATOM Feed"/><link rel="alternate" type="application/rss+xml" href="https://reactnative.dev/blog/feed.xml" title="React Native Blog RSS Feed"/><script>
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</script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/prism.css"/><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head><body class="sideNavVisible separateOnPageNav"><div class="fixedHeaderContainer"><div class="headerWrapper wrapper"><header><a href="/"><img class="logo" src="/img/header_logo.svg" alt="React Native"/><h2 class="headerTitleWithLogo">React Native</h2></a><a href="/versions"><h3>0.63</h3></a><div class="navigationWrapper navigationSlider"><nav class="slidingNav"><ul class="nav-site nav-site-internal"><li class=""><a href="/docs/getting-started" target="_self">Docs</a></li><li class=""><a href="/docs/components-and-apis" target="_self">Components</a></li><li class=""><a href="/docs/accessibilityinfo" target="_self">API</a></li><li class=""><a href="/help" target="_self">Community</a></li><li class=""><a href="/blog/" target="_self">Blog</a></li><li class="navSearchWrapper reactNavSearchWrapper"><input type="text" id="search_input_react" placeholder="Search" title="Search"/></li><li class=""><a href="https://github.com/facebook/react-native" target="_self">GitHub</a></li></ul></nav></div></header></div></div><div class="navPusher"><div class="docMainWrapper wrapper"><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/facebook/react-native-website/blob/master/docs/listviewdatasource.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">ListViewDataSource</h1></header><article><div><span><p>Provides efficient data processing and access to the <code>ListView</code> component. A <code>ListViewDataSource</code> is created with functions for extracting data from the input blob, and comparing elements (with default implementations for convenience). The input blob can be as flat as an array of strings, or an object with rows nested inside section objects.</p>
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<p>To update the data in the datasource, use <code>cloneWithRows</code> (or <code>cloneWithRowsAndSections</code> if you care about sections). The data in the data source is immutable, so you can't modify it directly. The clone methods take in the new data and compute a diff for each row so ListView knows whether to re-render it or not.</p>
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<p>In this example, a component receives data in chunks, handled by <code>_onDataArrived</code>, which concats the new data onto the old data and updates the data source. We use <code>concat</code> to create a new array - mutating <code>this._data</code>, e.g. with <code>this._data.push(newRowData)</code>, would be an error. <code>_rowHasChanged</code> understands the shape of the row data and knows how to efficiently compare it.</p>
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<pre><code class="hljs css language-jsx"><span class="token function-variable function">getInitialState</span><span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">var</span> ds <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ListView<span class="token punctuation">.</span>DataSource</span><span class="token punctuation">(</span><span class="token punctuation">{</span>rowHasChanged<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>_rowHasChanged<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">return</span> <span class="token punctuation">{</span>ds<span class="token punctuation">}</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span class="token punctuation">,</span>
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<span class="token function">_onDataArrived</span><span class="token punctuation">(</span><span class="token parameter">newData</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>_data <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>_data<span class="token punctuation">.</span><span class="token function">concat</span><span class="token punctuation">(</span>newData<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">setState</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
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ds<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>ds<span class="token punctuation">.</span><span class="token function">cloneWithRows</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>_data<span class="token punctuation">)</span>
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<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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</code></pre>
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<h3><a class="anchor" aria-hidden="true" id="methods"></a><a href="#methods" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Methods</h3>
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<ul>
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<li><a href="listviewdatasource.md#constructor"><code>constructor</code></a></li>
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<li><a href="listviewdatasource.md#clonewithrows"><code>cloneWithRows</code></a></li>
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<li><a href="listviewdatasource.md#clonewithrowsandsections"><code>cloneWithRowsAndSections</code></a></li>
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<li><a href="listviewdatasource.md#getrowcount"><code>getRowCount</code></a></li>
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<li><a href="listviewdatasource.md#getrowandsectioncount"><code>getRowAndSectionCount</code></a></li>
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<li><a href="listviewdatasource.md#rowshouldupdate"><code>rowShouldUpdate</code></a></li>
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<li><a href="listviewdatasource.md#getrowdata"><code>getRowData</code></a></li>
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<li><a href="listviewdatasource.md#getrowidforflatindex"><code>getRowIDForFlatIndex</code></a></li>
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<li><a href="listviewdatasource.md#getsectionidforflatindex"><code>getSectionIDForFlatIndex</code></a></li>
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<li><a href="listviewdatasource.md#getsectionlengths"><code>getSectionLengths</code></a></li>
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<li><a href="listviewdatasource.md#sectionheadershouldupdate"><code>sectionHeaderShouldUpdate</code></a></li>
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<li><a href="listviewdatasource.md#getsectionheaderdata"><code>getSectionHeaderData</code></a></li>
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</ul>
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<hr>
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<h1><a class="anchor" aria-hidden="true" id="reference"></a><a href="#reference" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Reference</h1>
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<h2><a class="anchor" aria-hidden="true" id="methods-1"></a><a href="#methods-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Methods</h2>
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<h3><a class="anchor" aria-hidden="true" id="constructor"></a><a href="#constructor" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>constructor()</code></h3>
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<pre><code class="hljs css language-jsx"><span class="token function">constructor</span><span class="token punctuation">(</span>params<span class="token punctuation">)</span><span class="token punctuation">;</span>
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</code></pre>
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<p>You can provide custom extraction and <code>hasChanged</code> functions for section headers and rows. If absent, data will be extracted with the <code>defaultGetRowData</code> and <code>defaultGetSectionHeaderData</code> functions.</p>
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<p>The default extractor expects data of one of the following forms:</p>
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<pre><code class="hljs"> { sectionID_1: { rowID_1: <rowData1>, ... }, ... }
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</code></pre>
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<p>or</p>
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<pre><code class="hljs"> { sectionID_1: [ <rowData1>, <rowData2>, ... ], ... }
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</code></pre>
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<p>or</p>
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<pre><code class="hljs"> [ [ <rowData1>, <rowData2>, ... ], ... ]
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</code></pre>
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<p>The constructor takes in a params argument that can contain any of the following:</p>
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<ul>
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<li>getRowData(dataBlob, sectionID, rowID);</li>
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<li>getSectionHeaderData(dataBlob, sectionID);</li>
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<li>rowHasChanged(prevRowData, nextRowData);</li>
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<li>sectionHeaderHasChanged(prevSectionData, nextSectionData);</li>
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</ul>
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<hr>
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<h3><a class="anchor" aria-hidden="true" id="clonewithrows"></a><a href="#clonewithrows" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>cloneWithRows()</code></h3>
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<pre><code class="hljs css language-jsx"><span class="token function">cloneWithRows</span><span class="token punctuation">(</span>dataBlob<span class="token punctuation">,</span> rowIdentities<span class="token punctuation">)</span><span class="token punctuation">;</span>
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</code></pre>
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<p>Clones this <code>ListViewDataSource</code> with the specified <code>dataBlob</code> and <code>rowIdentities</code>. The <code>dataBlob</code> an arbitrary blob of data. At construction an extractor to get the interesting information was defined (or the default was used).</p>
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<p>The <code>rowIdentities</code> is a 2D array of identifiers for rows. ie. [['a1', 'a2'], ['b1', 'b2', 'b3'], ...]. If not provided, it's assumed that the keys of the section data are the row identities.</p>
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<p>Note: This function does NOT clone the data in this data source. It only passes the functions defined at construction to a new data source with the data specified. If you wish to maintain the existing data you must handle merging of old and new data separately and then pass that into this function as the <code>dataBlob</code>.</p>
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<hr>
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<h3><a class="anchor" aria-hidden="true" id="clonewithrowsandsections"></a><a href="#clonewithrowsandsections" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>cloneWithRowsAndSections()</code></h3>
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<pre><code class="hljs css language-jsx"><span class="token function">cloneWithRowsAndSections</span><span class="token punctuation">(</span>
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dataBlob<span class="token punctuation">,</span>
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sectionIdentities<span class="token punctuation">,</span>
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rowIdentities
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<span class="token punctuation">)</span><span class="token punctuation">;</span>
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</code></pre>
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<p>This performs the same function as the <code>cloneWithRows</code> function but here you also specify what your <code>sectionIdentities</code> are. If you don't care about sections you should safely be able to use <code>cloneWithRows</code>.</p>
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<p><code>sectionIdentities</code> is an array of identifiers for sections. ie. ['s1', 's2', ...]. The identifiers should correspond to the keys or array indexes of the data you wish to include. If not provided, it's assumed that the keys of dataBlob are the section identities.</p>
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<p>Note: this returns a new object!</p>
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<pre><code class="hljs">const dataSource = ds.cloneWithRowsAndSections({
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addresses: [<span class="hljs-string">'row 1'</span>, <span class="hljs-string">'row 2'</span>],
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phone_numbers: [<span class="hljs-string">'data 1'</span>, <span class="hljs-string">'data 2'</span>],
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}, [<span class="hljs-string">'phone_numbers'</span>]);
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</code></pre>
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<hr>
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<h3><a class="anchor" aria-hidden="true" id="getrowcount"></a><a href="#getrowcount" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>getRowCount()</code></h3>
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<pre><code class="hljs css language-jsx"><span class="token function">getRowCount</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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</code></pre>
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<p>Returns the total number of rows in the data source.</p>
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<p>If you are specifying the rowIdentities or sectionIdentities, then <code>getRowCount</code> will return the number of rows in the filtered data source.</p>
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<hr>
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<h3><a class="anchor" aria-hidden="true" id="getrowandsectioncount"></a><a href="#getrowandsectioncount" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>getRowAndSectionCount()</code></h3>
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<pre><code class="hljs css language-jsx"><span class="token function">getRowAndSectionCount</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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</code></pre>
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<p>Returns the total number of rows in the data source (see <code>getRowCount</code> for how this is calculated) plus the number of sections in the data.</p>
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<p>If you are specifying the rowIdentities or sectionIdentities, then <code>getRowAndSectionCount</code> will return the number of rows & sections in the filtered data source.</p>
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<hr>
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<h3><a class="anchor" aria-hidden="true" id="rowshouldupdate"></a><a href="#rowshouldupdate" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>rowShouldUpdate()</code></h3>
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<pre><code class="hljs css language-jsx"><span class="token function">rowShouldUpdate</span><span class="token punctuation">(</span>sectionIndex<span class="token punctuation">,</span> rowIndex<span class="token punctuation">)</span><span class="token punctuation">;</span>
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</code></pre>
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<p>Returns if the row is dirtied and needs to be rerendered</p>
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<hr>
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|
<h3><a class="anchor" aria-hidden="true" id="getrowdata"></a><a href="#getrowdata" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>getRowData()</code></h3>
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<pre><code class="hljs css language-jsx"><span class="token function">getRowData</span><span class="token punctuation">(</span>sectionIndex<span class="token punctuation">,</span> rowIndex<span class="token punctuation">)</span><span class="token punctuation">;</span>
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</code></pre>
|
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<p>Gets the data required to render the row.</p>
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<hr>
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<h3><a class="anchor" aria-hidden="true" id="getrowidforflatindex"></a><a href="#getrowidforflatindex" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>getRowIDForFlatIndex()</code></h3>
|
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<pre><code class="hljs css language-jsx"><span class="token function">getRowIDForFlatIndex</span><span class="token punctuation">(</span>index<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
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</code></pre>
|
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<p>Gets the rowID at index provided if the dataSource arrays were flattened, or null of out of range indexes.</p>
|
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<hr>
|
|
<h3><a class="anchor" aria-hidden="true" id="getsectionidforflatindex"></a><a href="#getsectionidforflatindex" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>getSectionIDForFlatIndex()</code></h3>
|
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<pre><code class="hljs css language-jsx"><span class="token function">getSectionIDForFlatIndex</span><span class="token punctuation">(</span>index<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
</code></pre>
|
|
<p>Gets the sectionID at index provided if the dataSource arrays were flattened, or null for out of range indexes.</p>
|
|
<hr>
|
|
<h3><a class="anchor" aria-hidden="true" id="getsectionlengths"></a><a href="#getsectionlengths" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>getSectionLengths()</code></h3>
|
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<pre><code class="hljs css language-jsx"><span class="token function">getSectionLengths</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
</code></pre>
|
|
<p>Returns an array containing the number of rows in each section</p>
|
|
<hr>
|
|
<h3><a class="anchor" aria-hidden="true" id="sectionheadershouldupdate"></a><a href="#sectionheadershouldupdate" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>sectionHeaderShouldUpdate()</code></h3>
|
|
<pre><code class="hljs css language-jsx"><span class="token function">sectionHeaderShouldUpdate</span><span class="token punctuation">(</span>sectionIndex<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
</code></pre>
|
|
<p>Returns if the section header is dirtied and needs to be rerendered</p>
|
|
<hr>
|
|
<h3><a class="anchor" aria-hidden="true" id="getsectionheaderdata"></a><a href="#getsectionheaderdata" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>getSectionHeaderData()</code></h3>
|
|
<pre><code class="hljs css language-jsx"><span class="token function">getSectionHeaderData</span><span class="token punctuation">(</span>sectionIndex<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
</code></pre>
|
|
<p>Gets the data required to render the section header</p>
|
|
</span></div></article></div><div class="docs-prevnext"></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#methods-1">Methods</a><ul class="toc-headings"><li><a href="#constructor"><code>constructor()</code></a></li><li><a href="#clonewithrows"><code>cloneWithRows()</code></a></li><li><a href="#clonewithrowsandsections"><code>cloneWithRowsAndSections()</code></a></li><li><a href="#getrowcount"><code>getRowCount()</code></a></li><li><a href="#getrowandsectioncount"><code>getRowAndSectionCount()</code></a></li><li><a href="#rowshouldupdate"><code>rowShouldUpdate()</code></a></li><li><a href="#getrowdata"><code>getRowData()</code></a></li><li><a href="#getrowidforflatindex"><code>getRowIDForFlatIndex()</code></a></li><li><a href="#getsectionidforflatindex"><code>getSectionIDForFlatIndex()</code></a></li><li><a href="#getsectionlengths"><code>getSectionLengths()</code></a></li><li><a href="#sectionheadershouldupdate"><code>sectionHeaderShouldUpdate()</code></a></li><li><a href="#getsectionheaderdata"><code>getSectionHeaderData()</code></a></li></ul></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><div><h5>Docs</h5><a href="/docs/getting-started">Getting Started</a><a href="/docs/tutorial">Tutorial</a><a href="/docs/components-and-apis">Components and APIs</a><a href="/docs/more-resources">More Resources</a></div><div><h5>Community</h5><a href="/help">The React Native Community</a><a href="/showcase">Who's using React Native?</a><a href="https://stackoverflow.com/questions/tagged/react-native" target="_blank">Ask Questions on Stack Overflow</a><a href="https://github.com/facebook/react-native/blob/master/CONTRIBUTING.md">Contributor Guide</a><a href="https://dev.to/t/reactnative" target="_blank">DEV Community</a></div><div><h5>More Resources</h5><a href="/blog">Blog</a><a href="https://twitter.com/reactnative" target="_blank">Twitter</a><a href="https://github.com/facebook/react-native" target="_blank">GitHub</a><a href="https://reactjs.org" target="_blank">React</a></div></section><a href="https://code.facebook.com/projects/" target="_blank" class="fbOpenSource"><img src="/img/oss_logo.png" alt="Facebook Open Source" width="170" height="45"/></a><section class="copyright">Copyright © 2020 Facebook Inc.</section></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>window.fbAsyncInit = function() {FB.init({appId:'1677033832619985',xfbml:true,version:'v2.7'});};(function(d, s, id){var js, fjs = d.getElementsByTagName(s)[0];if (d.getElementById(id)) {return;}js = d.createElement(s); js.id = id;js.src = '//connect.facebook.net/en_US/sdk.js';fjs.parentNode.insertBefore(js, fjs);}(document, 'script','facebook-jssdk'));
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