/
DOMChildrenOperations.js
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/
DOMChildrenOperations.js
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/**
* 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 DOMChildrenOperations
* @typechecks static-only
*/
'use strict';
var Danger = require('Danger');
var ReactMultiChildUpdateTypes = require('ReactMultiChildUpdateTypes');
var setInnerHTML = require('setInnerHTML');
var setTextContent = require('setTextContent');
var invariant = require('invariant');
/**
* Inserts `childNode` as a child of `parentNode` at the `index`.
*
* @param {DOMElement} parentNode Parent node in which to insert.
* @param {DOMElement} childNode Child node to insert.
* @param {number} index Index at which to insert the child.
* @internal
*/
function insertChildAt(parentNode, childNode, index) {
// By exploiting arrays returning `undefined` for an undefined index, we can
// rely exclusively on `insertBefore(node, null)` instead of also using
// `appendChild(node)`. However, using `undefined` is not allowed by all
// browsers so we must replace it with `null`.
// fix render order error in safari
// IE8 will throw error when index out of list size.
var beforeChild = index >= parentNode.childNodes.length ?
null :
parentNode.childNodes.item(index);
parentNode.insertBefore(
childNode,
beforeChild
);
}
/**
* Operations for updating with DOM children.
*/
var DOMChildrenOperations = {
dangerouslyReplaceNodeWithMarkup: Danger.dangerouslyReplaceNodeWithMarkup,
updateTextContent: setTextContent,
/**
* Updates a component's children by processing a series of updates. The
* update configurations are each expected to have a `parentNode` property.
*
* @param {array<object>} updates List of update configurations.
* @param {array<string>} markupList List of markup strings.
* @internal
*/
processUpdates: function(updates, markupList) {
var update;
// Mapping from parent IDs to initial child orderings.
var initialChildren = null;
// List of children that will be moved or removed.
var updatedChildren = null;
for (var i = 0; i < updates.length; i++) {
update = updates[i];
if (update.type === ReactMultiChildUpdateTypes.MOVE_EXISTING ||
update.type === ReactMultiChildUpdateTypes.REMOVE_NODE) {
var updatedIndex = update.fromIndex;
var updatedChild = update.parentNode.childNodes[updatedIndex];
var parentID = update.parentID;
invariant(
updatedChild,
'processUpdates(): Unable to find child %s of element. This ' +
'probably means the DOM was unexpectedly mutated (e.g., by the ' +
'browser), usually due to forgetting a <tbody> when using tables, ' +
'nesting tags like <form>, <p>, or <a>, or using non-SVG elements ' +
'in an <svg> parent. Try inspecting the child nodes of the element ' +
'with React ID `%s`.',
updatedIndex,
parentID
);
initialChildren = initialChildren || {};
initialChildren[parentID] = initialChildren[parentID] || [];
initialChildren[parentID][updatedIndex] = updatedChild;
updatedChildren = updatedChildren || [];
updatedChildren.push(updatedChild);
}
}
var renderedMarkup = Danger.dangerouslyRenderMarkup(markupList);
// Remove updated children first so that `toIndex` is consistent.
if (updatedChildren) {
for (var j = 0; j < updatedChildren.length; j++) {
updatedChildren[j].parentNode.removeChild(updatedChildren[j]);
}
}
for (var k = 0; k < updates.length; k++) {
update = updates[k];
switch (update.type) {
case ReactMultiChildUpdateTypes.INSERT_MARKUP:
insertChildAt(
update.parentNode,
renderedMarkup[update.markupIndex],
update.toIndex
);
break;
case ReactMultiChildUpdateTypes.MOVE_EXISTING:
insertChildAt(
update.parentNode,
initialChildren[update.parentID][update.fromIndex],
update.toIndex
);
break;
case ReactMultiChildUpdateTypes.SET_MARKUP:
setInnerHTML(
update.parentNode,
update.content
);
break;
case ReactMultiChildUpdateTypes.TEXT_CONTENT:
setTextContent(
update.parentNode,
update.content
);
break;
case ReactMultiChildUpdateTypes.REMOVE_NODE:
// Already removed by the for-loop above.
break;
}
}
},
};
module.exports = DOMChildrenOperations;