react/src/browser/dom/DOMPropertyOperations.js

/**
 * Copyright 2013 Facebook, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * @providesModule DOMPropertyOperations
 * @typechecks static-only
 */

"use strict";

var DOMProperty = require('DOMProperty');

var escapeTextForBrowser = require('escapeTextForBrowser');
var memoizeStringOnly = require('memoizeStringOnly');

function shouldIgnoreValue(name, value) {
  return value == null ||
    DOMProperty.hasBooleanValue[name] && !value ||
    DOMProperty.hasPositiveNumericValue[name] && (isNaN(value) || value < 1);
}

var processAttributeNameAndPrefix = memoizeStringOnly(function(name) {
  return escapeTextForBrowser(name) + '="';
});

if (__DEV__) {
  var reactProps = {
    children: true,
    dangerouslySetInnerHTML: true,
    key: true,
    ref: true
  };
  var warnedProperties = {};

  var warnUnknownProperty = function(name) {
    if (reactProps[name] || warnedProperties[name]) {
      return;
    }

    warnedProperties[name] = true;
    var lowerCasedName = name.toLowerCase();

    // data-* attributes should be lowercase; suggest the lowercase version
    var standardName = DOMProperty.isCustomAttribute(lowerCasedName) ?
      lowerCasedName : DOMProperty.getPossibleStandardName[lowerCasedName];

    // For now, only warn when we have a suggested correction. This prevents
    // logging too much when using transferPropsTo.
    if (standardName != null) {
      console.warn(
        'Unknown DOM property ' + name + '. Did you mean ' + standardName + '?'
      );
    }

  };
}

/**
 * Operations for dealing with DOM properties.
 */
var DOMPropertyOperations = {

  /**
   * Creates markup for the ID property.
   *
   * @param {string} id Unescaped ID.
   * @return {string} Markup string.
   */
  createMarkupForID: function(id) {
    return processAttributeNameAndPrefix(DOMProperty.ID_ATTRIBUTE_NAME) +
      escapeTextForBrowser(id) + '"';
  },

  /**
   * Creates markup for a property.
   *
   * @param {string} name
   * @param {*} value
   * @return {?string} Markup string, or null if the property was invalid.
   */
  createMarkupForProperty: function(name, value) {
    if (DOMProperty.isStandardName[name]) {
      if (shouldIgnoreValue(name, value)) {
        return '';
      }
      var attributeName = DOMProperty.getAttributeName[name];
      if (DOMProperty.hasBooleanValue[name]) {
        return escapeTextForBrowser(attributeName);
      }
      return processAttributeNameAndPrefix(attributeName) +
        escapeTextForBrowser(value) + '"';
    } else if (DOMProperty.isCustomAttribute(name)) {
      if (value == null) {
        return '';
      }
      return processAttributeNameAndPrefix(name) +
        escapeTextForBrowser(value) + '"';
    } else if (__DEV__) {
      warnUnknownProperty(name);
    }
    return null;
  },

  /**
   * Sets the value for a property on a node.
   *
   * @param {DOMElement} node
   * @param {string} name
   * @param {*} value
   */
  setValueForProperty: function(node, name, value) {
    if (DOMProperty.isStandardName[name]) {
      var mutationMethod = DOMProperty.getMutationMethod[name];
      if (mutationMethod) {
        mutationMethod(node, value);
      } else if (shouldIgnoreValue(name, value)) {
        this.deleteValueForProperty(node, name);
      } else if (DOMProperty.mustUseAttribute[name]) {
        node.setAttribute(DOMProperty.getAttributeName[name], '' + value);
      } else {
        var propName = DOMProperty.getPropertyName[name];
        if (!DOMProperty.hasSideEffects[name] || node[propName] !== value) {
          node[propName] = value;
        }
      }
    } else if (DOMProperty.isCustomAttribute(name)) {
      if (value == null) {
        node.removeAttribute(DOMProperty.getAttributeName[name]);
      } else {
        node.setAttribute(name, '' + value);
      }
    } else if (__DEV__) {
      warnUnknownProperty(name);
    }
  },

  /**
   * Deletes the value for a property on a node.
   *
   * @param {DOMElement} node
   * @param {string} name
   */
  deleteValueForProperty: function(node, name) {
    if (DOMProperty.isStandardName[name]) {
      var mutationMethod = DOMProperty.getMutationMethod[name];
      if (mutationMethod) {
        mutationMethod(node, undefined);
      } else if (DOMProperty.mustUseAttribute[name]) {
        node.removeAttribute(DOMProperty.getAttributeName[name]);
      } else {
        var propName = DOMProperty.getPropertyName[name];
        var defaultValue = DOMProperty.getDefaultValueForProperty(
          node.nodeName,
          name
        );
        if (!DOMProperty.hasSideEffects[name] ||
            node[propName] !== defaultValue) {
          node[propName] = defaultValue;
        }
      }
    } else if (DOMProperty.isCustomAttribute(name)) {
      node.removeAttribute(name);
    } else if (__DEV__) {
      warnUnknownProperty(name);
    }
  }

};

module.exports = DOMPropertyOperations;