DOMPropertyOperations.js

/**
 * Copyright 2013-2015, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * @providesModule DOMPropertyOperations
 * @typechecks static-only
 */

'use strict';

var DOMProperty = require('DOMProperty');

var quoteAttributeValueForBrowser = require('quoteAttributeValueForBrowser');
var warning = require('warning');

// Simplified subset
var VALID_ATTRIBUTE_NAME_REGEX = /^[a-zA-Z_][a-zA-Z_\.\-\d]*$/;
var illegalAttributeNameCache = {};
var validatedAttributeNameCache = {};

function isAttributeNameSafe(attributeName) {
  if (validatedAttributeNameCache.hasOwnProperty(attributeName)) {
    return true;
  }
  if (illegalAttributeNameCache.hasOwnProperty(attributeName)) {
    return false;
  }
  if (VALID_ATTRIBUTE_NAME_REGEX.test(attributeName)) {
    validatedAttributeNameCache[attributeName] = true;
    return true;
  }
  illegalAttributeNameCache[attributeName] = true;
  warning(
    false,
    'Invalid attribute name: `%s`',
    attributeName
  );
  return false;
}

function shouldIgnoreValue(propertyInfo, value) {
  return value == null ||
    (propertyInfo.hasBooleanValue && !value) ||
    (propertyInfo.hasNumericValue && isNaN(value)) ||
    (propertyInfo.hasPositiveNumericValue && (value < 1)) ||
    (propertyInfo.hasOverloadedBooleanValue && value === false);
}

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

  var warnUnknownProperty = function(name) {
    if (reactProps.hasOwnProperty(name) && reactProps[name] ||
        warnedProperties.hasOwnProperty(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.hasOwnProperty(lowerCasedName) ?
        DOMProperty.getPossibleStandardName[lowerCasedName] :
        null
    );

    // For now, only warn when we have a suggested correction. This prevents
    // logging too much when using transferPropsTo.
    warning(
      standardName == null,
      'Unknown DOM property %s. Did you mean %s?',
      name,
      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 DOMProperty.ID_ATTRIBUTE_NAME + '=' +
      quoteAttributeValueForBrowser(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) {
    var propertyInfo = DOMProperty.properties.hasOwnProperty(name) ?
        DOMProperty.properties[name] : null;
    if (propertyInfo) {
      if (shouldIgnoreValue(propertyInfo, value)) {
        return '';
      }
      var attributeName = propertyInfo.attributeName;
      if (propertyInfo.hasBooleanValue ||
          (propertyInfo.hasOverloadedBooleanValue && value === true)) {
        return attributeName + '=""';
      }
      return attributeName + '=' + quoteAttributeValueForBrowser(value);
    } else if (DOMProperty.isCustomAttribute(name)) {
      if (value == null) {
        return '';
      }
      return name + '=' + quoteAttributeValueForBrowser(value);
    } else if (__DEV__) {
      warnUnknownProperty(name);
    }
    return null;
  },

  /**
   * Creates markup for a custom property.
   *
   * @param {string} name
   * @param {*} value
   * @return {string} Markup string, or empty string if the property was invalid.
   */
  createMarkupForCustomAttribute: function(name, value) {
    if (!isAttributeNameSafe(name) || value == null) {
      return '';
    }
    return name + '=' + quoteAttributeValueForBrowser(value);
  },

  /**
   * Sets the value for a property on a node.
   *
   * @param {DOMElement} node
   * @param {string} name
   * @param {*} value
   */
  setValueForProperty: function(node, name, value) {
    var propertyInfo = DOMProperty.properties.hasOwnProperty(name) ?
        DOMProperty.properties[name] : null;
    if (propertyInfo) {
      var mutationMethod = propertyInfo.mutationMethod;
      if (mutationMethod) {
        mutationMethod(node, value);
      } else if (shouldIgnoreValue(propertyInfo, value)) {
        this.deleteValueForProperty(node, name);
      } else if (propertyInfo.mustUseAttribute) {
        var attributeName = propertyInfo.attributeName;
        var namespace = propertyInfo.attributeNamespace;
        // `setAttribute` with objects becomes only `[object]` in IE8/9,
        // ('' + value) makes it output the correct toString()-value.
        if (namespace) {
          node.setAttributeNS(namespace, attributeName, '' + value);
        } else {
          node.setAttribute(attributeName, '' + value);
        }
      } else {
        var propName = propertyInfo.propertyName;
        // Must explicitly cast values for HAS_SIDE_EFFECTS-properties to the
        // property type before comparing; only `value` does and is string.
        if (!propertyInfo.hasSideEffects ||
            ('' + node[propName]) !== ('' + value)) {
          // Contrary to `setAttribute`, object properties are properly
          // `toString`ed by IE8/9.
          node[propName] = value;
        }
      }
    } else if (DOMProperty.isCustomAttribute(name)) {
      DOMPropertyOperations.setValueForAttribute(node, name, value);
    } else if (__DEV__) {
      warnUnknownProperty(name);
    }
  },

  setValueForAttribute: function(node, name, value) {
    if (!isAttributeNameSafe(name)) {
      return;
    }
    if (value == null) {
      node.removeAttribute(name);
    } else {
      node.setAttribute(name, '' + value);
    }
  },

  /**
   * Deletes the value for a property on a node.
   *
   * @param {DOMElement} node
   * @param {string} name
   */
  deleteValueForProperty: function(node, name) {
    var propertyInfo = DOMProperty.properties.hasOwnProperty(name) ?
        DOMProperty.properties[name] : null;
    if (propertyInfo) {
      var mutationMethod = propertyInfo.mutationMethod;
      if (mutationMethod) {
        mutationMethod(node, undefined);
      } else if (propertyInfo.mustUseAttribute) {
        node.removeAttribute(propertyInfo.attributeName);
      } else {
        var propName = propertyInfo.propertyName;
        var defaultValue = DOMProperty.getDefaultValueForProperty(
          node.nodeName,
          propName
        );
        if (!propertyInfo.hasSideEffects ||
            ('' + node[propName]) !== defaultValue) {
          node[propName] = defaultValue;
        }
      }
    } else if (DOMProperty.isCustomAttribute(name)) {
      node.removeAttribute(name);
    } else if (__DEV__) {
      warnUnknownProperty(name);
    }
  },

};

module.exports = DOMPropertyOperations;