340 lines
12 KiB
JavaScript
340 lines
12 KiB
JavaScript
(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.morphdom = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
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var specialElHandlers = {
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/**
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* Needed for IE. Apparently IE doesn't think
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* that "selected" is an attribute when reading
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* over the attributes using selectEl.attributes
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*/
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OPTION: function(fromEl, toEl) {
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if ((fromEl.selected = toEl.selected)) {
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fromEl.setAttribute('selected', '');
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} else {
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fromEl.removeAttribute('selected', '');
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}
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},
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/**
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* The "value" attribute is special for the <input> element
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* since it sets the initial value. Changing the "value"
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* attribute without changing the "value" property will have
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* no effect since it is only used to the set the initial value.
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* Similar for the "checked" attribute.
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*/
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/*INPUT: function(fromEl, toEl) {
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fromEl.checked = toEl.checked;
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fromEl.value = toEl.value;
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if (!toEl.hasAttribute('checked')) {
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fromEl.removeAttribute('checked');
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}
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if (!toEl.hasAttribute('value')) {
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fromEl.removeAttribute('value');
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}
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}*/
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};
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function noop() {}
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/**
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* Loop over all of the attributes on the target node and make sure the
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* original DOM node has the same attributes. If an attribute
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* found on the original node is not on the new node then remove it from
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* the original node
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* @param {HTMLElement} fromNode
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* @param {HTMLElement} toNode
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*/
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function morphAttrs(fromNode, toNode) {
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var attrs = toNode.attributes;
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var i;
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var attr;
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var attrName;
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var attrValue;
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var foundAttrs = {};
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for (i=attrs.length-1; i>=0; i--) {
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attr = attrs[i];
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if (attr.specified !== false) {
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attrName = attr.name;
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attrValue = attr.value;
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foundAttrs[attrName] = true;
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if (fromNode.getAttribute(attrName) !== attrValue) {
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fromNode.setAttribute(attrName, attrValue);
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}
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}
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}
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// Delete any extra attributes found on the original DOM element that weren't
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// found on the target element.
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attrs = fromNode.attributes;
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for (i=attrs.length-1; i>=0; i--) {
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attr = attrs[i];
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if (attr.specified !== false) {
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attrName = attr.name;
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if (!foundAttrs.hasOwnProperty(attrName)) {
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fromNode.removeAttribute(attrName);
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}
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}
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}
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}
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/**
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* Copies the children of one DOM element to another DOM element
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*/
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function moveChildren(from, to) {
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var curChild = from.firstChild;
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while(curChild) {
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var nextChild = curChild.nextSibling;
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to.appendChild(curChild);
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curChild = nextChild;
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}
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return to;
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}
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function morphdom(fromNode, toNode, options) {
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if (!options) {
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options = {};
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}
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if (typeof toNode === 'string') {
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var newBodyEl = document.createElement('body');
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newBodyEl.innerHTML = toNode;
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toNode = newBodyEl.childNodes[0];
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}
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var savedEls = {}; // Used to save off DOM elements with IDs
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var unmatchedEls = {};
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var onNodeDiscarded = options.onNodeDiscarded || noop;
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var onBeforeMorphEl = options.onBeforeMorphEl || noop;
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var onBeforeMorphElChildren = options.onBeforeMorphElChildren || noop;
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function removeNodeHelper(node, nestedInSavedEl) {
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var id = node.id;
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// If the node has an ID then save it off since we will want
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// to reuse it in case the target DOM tree has a DOM element
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// with the same ID
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if (id) {
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savedEls[id] = node;
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} else if (!nestedInSavedEl) {
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// If we are not nested in a saved element then we know that this node has been
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// completely discarded and will not exist in the final DOM.
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onNodeDiscarded(node);
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}
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if (node.nodeType === 1) {
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var curChild = node.firstChild;
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while(curChild) {
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removeNodeHelper(curChild, nestedInSavedEl || id);
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curChild = curChild.nextSibling;
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}
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}
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}
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function walkDiscardedChildNodes(node) {
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if (node.nodeType === 1) {
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var curChild = node.firstChild;
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while(curChild) {
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if (!curChild.id) {
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// We only want to handle nodes that don't have an ID to avoid double
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// walking the same saved element.
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onNodeDiscarded(curChild);
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// Walk recursively
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walkDiscardedChildNodes(curChild);
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}
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curChild = curChild.nextSibling;
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}
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}
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}
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function removeNode(node, parentNode, alreadyVisited) {
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parentNode.removeChild(node);
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if (alreadyVisited) {
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if (!node.id) {
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onNodeDiscarded(node);
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walkDiscardedChildNodes(node);
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}
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} else {
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removeNodeHelper(node);
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}
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}
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function morphEl(fromNode, toNode, alreadyVisited) {
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if (toNode.id) {
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// If an element with an ID is being morphed then it is will be in the final
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// DOM so clear it out of the saved elements collection
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delete savedEls[toNode.id];
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}
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if (onBeforeMorphEl(fromNode, toNode) === false) {
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return;
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}
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morphAttrs(fromNode, toNode);
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if (onBeforeMorphElChildren(fromNode, toNode) === false) {
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return;
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}
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var curToNodeChild = toNode.firstChild;
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var curFromNodeChild = fromNode.firstChild;
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var curToNodeId;
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var fromNextSibling;
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var toNextSibling;
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var savedEl;
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var unmatchedEl;
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outer: while(curToNodeChild) {
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toNextSibling = curToNodeChild.nextSibling;
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curToNodeId = curToNodeChild.id;
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while(curFromNodeChild) {
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var curFromNodeId = curFromNodeChild.id;
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fromNextSibling = curFromNodeChild.nextSibling;
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if (!alreadyVisited) {
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if (curFromNodeId && (unmatchedEl = unmatchedEls[curFromNodeId])) {
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unmatchedEl.parentNode.replaceChild(curFromNodeChild, unmatchedEl);
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morphEl(curFromNodeChild, unmatchedEl, alreadyVisited);
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curFromNodeChild = fromNextSibling;
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continue;
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}
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}
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var curFromNodeType = curFromNodeChild.nodeType;
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if (curFromNodeType === curToNodeChild.nodeType) {
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var isCompatible = false;
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if (curFromNodeType === 1) { // Both nodes being compared are Element nodes
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if (curFromNodeChild.tagName === curToNodeChild.tagName) {
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// We have compatible DOM elements
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if (curFromNodeId || curToNodeId) {
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// If either DOM element has an ID then we handle
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// those differently since we want to match up
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// by ID
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if (curToNodeId === curFromNodeId) {
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isCompatible = true;
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}
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} else {
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isCompatible = true;
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}
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}
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if (isCompatible) {
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// We found compatible DOM elements so add a
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// task to morph the compatible DOM elements
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morphEl(curFromNodeChild, curToNodeChild, alreadyVisited);
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}
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} else if (curFromNodeType === 3) { // Both nodes being compared are Text nodes
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isCompatible = true;
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curFromNodeChild.nodeValue = curToNodeChild.nodeValue;
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}
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if (isCompatible) {
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curToNodeChild = toNextSibling;
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curFromNodeChild = fromNextSibling;
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continue outer;
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}
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}
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// No compatible match so remove the old node from the DOM
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removeNode(curFromNodeChild, fromNode, alreadyVisited);
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curFromNodeChild = fromNextSibling;
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}
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if (curToNodeId) {
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if ((savedEl = savedEls[curToNodeId])) {
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morphEl(savedEl, curToNodeChild, true);
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curToNodeChild = savedEl; // We want to append the saved element instead
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} else {
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// The current DOM element in the target tree has an ID
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// but we did not find a match in any of the corresponding
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// siblings. We just put the target element in the old DOM tree
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// but if we later find an element in the old DOM tree that has
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// a matching ID then we will replace the target element
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// with the corresponding old element and morph the old element
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unmatchedEls[curToNodeId] = curToNodeChild;
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}
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}
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// If we got this far then we did not find a candidate match for our "to node"
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// and we exhausted all of the children "from" nodes. Therefore, we will just
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// append the current "to node" to the end
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fromNode.appendChild(curToNodeChild);
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curToNodeChild = toNextSibling;
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curFromNodeChild = fromNextSibling;
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}
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// We have processed all of the "to nodes". If curFromNodeChild is non-null then
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// we still have some from nodes left over that need to be removed
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while(curFromNodeChild) {
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fromNextSibling = curFromNodeChild.nextSibling;
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removeNode(curFromNodeChild, fromNode, alreadyVisited);
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curFromNodeChild = fromNextSibling;
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}
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var specialElHandler = specialElHandlers[fromNode.tagName];
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if (specialElHandler) {
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specialElHandler(fromNode, toNode);
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}
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}
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var morphedNode = fromNode;
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var morphedNodeType = morphedNode.nodeType;
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var toNodeType = toNode.nodeType;
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// Handle the case where we are given two DOM nodes that are not
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// compatible (e.g. <div> --> <span> or <div> --> TEXT)
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if (morphedNodeType === 1) {
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if (toNodeType === 1) {
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if (morphedNode.tagName !== toNode.tagName) {
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onNodeDiscarded(fromNode);
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morphedNode = moveChildren(morphedNode, document.createElement(toNode.tagName));
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}
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} else {
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// Going from an element node to a text node
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return toNode;
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}
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} else if (morphedNodeType === 3) { // Text node
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if (toNodeType === 3) {
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morphedNode.nodeValue = toNode.nodeValue;
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return morphedNode;
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} else {
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onNodeDiscarded(fromNode);
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// Text node to something else
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return toNode;
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}
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}
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morphEl(morphedNode, toNode, false);
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// Fire the "onNodeDiscarded" event for any saved elements
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// that never found a new home in the morphed DOM
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for (var savedElId in savedEls) {
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if (savedEls.hasOwnProperty(savedElId)) {
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var savedEl = savedEls[savedElId];
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onNodeDiscarded(savedEl);
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walkDiscardedChildNodes(savedEl);
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}
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}
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if (morphedNode !== fromNode && fromNode.parentNode) {
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fromNode.parentNode.replaceChild(morphedNode, fromNode);
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}
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return morphedNode;
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}
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module.exports = morphdom;
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},{}]},{},[1])(1)
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}); |