DomHelper.js
/**
* @class Ext.DomHelper
* Utility class for working with DOM and/or Templates. It transparently supports using HTML fragments or DOM.
* For more information see <a href="http://www.jackslocum.com/yui/2006/10/06/domhelper-create-elements-using-dom-html-fragments-or-templates/">this blog post with examples</a>.
* @singleton
*/
Ext.DomHelper = function(){
var tempTableEl = null;
var emptyTags = /^(?:br|frame|hr|img|input|link|meta|range|spacer|wbr|area|param|col)$/i;
// build as innerHTML where available
/** @ignore */
var createHtml = function(o){
if(typeof o == 'string'){
return o;
}
var b = "";
if(!o.tag){
o.tag = "div";
}
b += "<" + o.tag;
for(var attr in o){
if(attr == "tag" || attr == "children" || attr == "cn" || attr == "html" || typeof o[attr] == "function") continue;
if(attr == "style"){
var s = o["style"];
if(typeof s == "function"){
s = s.call();
}
if(typeof s == "string"){
b += ' style="' + s + '"';
}else if(typeof s == "object"){
b += ' style="';
for(var key in s){
if(typeof s[key] != "function"){
b += key + ":" + s[key] + ";";
}
}
b += '"';
}
}else{
if(attr == "cls"){
b += ' class="' + o["cls"] + '"';
}else if(attr == "htmlFor"){
b += ' for="' + o["htmlFor"] + '"';
}else{
b += " " + attr + '="' + o[attr] + '"';
}
}
}
if(emptyTags.test(o.tag)){
b += "/>";
}else{
b += ">";
var cn = o.children || o.cn;
if(cn){
if(cn instanceof Array){
for(var i = 0, len = cn.length; i < len; i++) {
b += createHtml(cn[i], b);
}
}else{
b += createHtml(cn, b);
}
}
if(o.html){
b += o.html;
}
b += "</" + o.tag + ">";
}
return b;
};
// build as dom
/** @ignore */
var createDom = function(o, parentNode){
var el = document.createElement(o.tag);
var useSet = el.setAttribute ? true : false; // In IE some elements don't have setAttribute
for(var attr in o){
if(attr == "tag" || attr == "children" || attr == "cn" || attr == "html" || attr == "style" || typeof o[attr] == "function") continue;
if(attr=="cls"){
el.className = o["cls"];
}else{
if(useSet) el.setAttribute(attr, o[attr]);
else el[attr] = o[attr];
}
}
Ext.DomHelper.applyStyles(el, o.style);
var cn = o.children || o.cn;
if(cn){
if(cn instanceof Array){
for(var i = 0, len = cn.length; i < len; i++) {
createDom(cn[i], el);
}
}else{
createDom(cn, el);
}
}
if(o.html){
el.innerHTML = o.html;
}
if(parentNode){
parentNode.appendChild(el);
}
return el;
};
var ieTable = function(depth, s, h, e){
tempTableEl.innerHTML = [s, h, e].join('');
var i = -1, el = tempTableEl;
while(++i < depth){
el = el.firstChild;
}
return el;
};
// kill repeat to save bytes
var ts = '<table>',
te = '</table>',
tbs = ts+'<tbody>',
tbe = '</tbody>'+te,
trs = tbs + '<tr>',
tre = '</tr>'+tbe;
/**
* @ignore
* Nasty code for IE's broken table implementation
*/
var insertIntoTable = function(tag, where, el, html){
if(!tempTableEl){
tempTableEl = document.createElement('div');
}
var node;
var before = null;
if(tag == 'td'){
if(where == 'afterbegin' || where == 'beforeend'){ // INTO a TD
return;
}
if(where == 'beforebegin'){
before = el;
el = el.parentNode;
} else{
before = el.nextSibling;
el = el.parentNode;
}
node = ieTable(4, trs, html, tre);
}
else if(tag == 'tr'){
if(where == 'beforebegin'){
before = el;
el = el.parentNode;
node = ieTable(3, tbs, html, tbe);
} else if(where == 'afterend'){
before = el.nextSibling;
el = el.parentNode;
node = ieTable(3, tbs, html, tbe);
} else{ // INTO a TR
if(where == 'afterbegin'){
before = el.firstChild;
}
node = ieTable(4, trs, html, tre);
}
} else if(tag == 'tbody'){
if(where == 'beforebegin'){
before = el;
el = el.parentNode;
node = ieTable(2, ts, html, te);
} else if(where == 'afterend'){
before = el.nextSibling;
el = el.parentNode;
node = ieTable(2, ts, html, te);
} else{
if(where == 'afterbegin'){
before = el.firstChild;
}
node = ieTable(3, tbs, html, tbe);
}
} else{ // TABLE
if(where == 'beforebegin' || where == 'afterend'){ // OUTSIDE the table
return;
}
if(where == 'afterbegin'){
before = el.firstChild;
}
node = ieTable(2, ts, html, te);
}
el.insertBefore(node, before);
return node;
};
return {
/** True to force the use of DOM instead of html fragments @type Boolean */
useDom : false,
/**
* Returns the markup for the passed Element(s) config
* @param {Object} o The Dom object spec (and children)
* @return {String}
*/
markup : function(o){
return createHtml(o);
},
/**
* Applies a style specification to an element
* @param {String/HTMLElement} el The element to apply styles to
* @param {String/Object/Function} styles A style specification string eg "width:100px", or object in the form {width:"100px"}, or
* a function which returns such a specification.
*/
applyStyles : function(el, styles){
if(styles){
el = Ext.fly(el);
if(typeof styles == "string"){
var re = /\s?([a-z\-]*)\:\s?([^;]*);?/gi;
var matches;
while ((matches = re.exec(styles)) != null){
el.setStyle(matches[1], matches[2]);
}
}else if (typeof styles == "object"){
for (var style in styles){
el.setStyle(style, styles[style]);
}
}else if (typeof styles == "function"){
Ext.DomHelper.applyStyles(el, styles.call());
}
}
},
/**
* Inserts an HTML fragment into the Dom
* @param {String} where Where to insert the html in relation to el - beforeBegin, afterBegin, beforeEnd, afterEnd.
* @param {HTMLElement} el The context element
* @param {String} html The HTML fragmenet
* @return {HTMLElement} The new node
*/
insertHtml : function(where, el, html){
where = where.toLowerCase();
if(el.insertAdjacentHTML){
var tag = el.tagName.toLowerCase();
if(tag == "table" || tag == "tbody" || tag == "tr" || tag == 'td'){
var rs;
if(rs = insertIntoTable(tag, where, el, html)){
return rs;
}
}
switch(where){
case "beforebegin":
el.insertAdjacentHTML(where, html);
return el.previousSibling;
case "afterbegin":
el.insertAdjacentHTML(where, html);
return el.firstChild;
case "beforeend":
el.insertAdjacentHTML(where, html);
return el.lastChild;
case "afterend":
el.insertAdjacentHTML(where, html);
return el.nextSibling;
}
throw 'Illegal insertion point -> "' + where + '"';
}
var range = el.ownerDocument.createRange();
var frag;
switch(where){
case "beforebegin":
range.setStartBefore(el);
frag = range.createContextualFragment(html);
el.parentNode.insertBefore(frag, el);
return el.previousSibling;
case "afterbegin":
if(el.firstChild){
range.setStartBefore(el.firstChild);
frag = range.createContextualFragment(html);
el.insertBefore(frag, el.firstChild);
return el.firstChild;
}else{
el.innerHTML = html;
return el.firstChild;
}
case "beforeend":
if(el.lastChild){
range.setStartAfter(el.lastChild);
frag = range.createContextualFragment(html);
el.appendChild(frag);
return el.lastChild;
}else{
el.innerHTML = html;
return el.lastChild;
}
case "afterend":
range.setStartAfter(el);
frag = range.createContextualFragment(html);
el.parentNode.insertBefore(frag, el.nextSibling);
return el.nextSibling;
}
throw 'Illegal insertion point -> "' + where + '"';
},
/**
* Creates new Dom element(s) and inserts them before el
* @param {String/HTMLElement/Element} el The context element
* @param {Object} o The Dom object spec (and children)
* @param {Boolean} returnElement （可选） true to return a Ext.Element
* @return {HTMLElement} The new node
*/
insertBefore : function(el, o, returnElement){
return this.doInsert(el, o, returnElement, "beforeBegin");
},
/**
* Creates new Dom element(s) and inserts them after el
* @param {String/HTMLElement/Element} el The context element
* @param {Object} o The Dom object spec (and children)
* @param {Boolean} returnElement （可选） true to return a Ext.Element
* @return {HTMLElement} The new node
*/
insertAfter : function(el, o, returnElement){
return this.doInsert(el, o, returnElement, "afterEnd", "nextSibling");
},
/**
* Creates new Dom element(s) and inserts them as the first child of el
* @param {String/HTMLElement/Element} el The context element
* @param {Object} o The Dom object spec (and children)
* @param {Boolean} returnElement （可选） true to return a Ext.Element
* @return {HTMLElement} The new node
*/
insertFirst : function(el, o, returnElement){
return this.doInsert(el, o, returnElement, "afterBegin");
},
// private
doInsert : function(el, o, returnElement, pos, sibling){
el = Ext.getDom(el);
var newNode;
if(this.useDom){
newNode = createDom(o, null);
el.parentNode.insertBefore(newNode, sibling ? el[sibling] : el);
}else{
var html = createHtml(o);
newNode = this.insertHtml(pos, el, html);
}
return returnElement ? Ext.get(newNode, true) : newNode;
},
/**
* Creates new Dom element(s) and appends them to el
* @param {String/HTMLElement/Element} el The context element
* @param {Object} o The Dom object spec (and children)
* @param {Boolean} returnElement （可选） true to return a Ext.Element
* @return {HTMLElement} The new node
*/
append : function(el, o, returnElement){
el = Ext.getDom(el);
var newNode;
if(this.useDom){
newNode = createDom(o, null);
el.appendChild(newNode);
}else{
var html = createHtml(o);
newNode = this.insertHtml("beforeEnd", el, html);
}
return returnElement ? Ext.get(newNode, true) : newNode;
},
/**
* Creates new Dom element(s) and overwrites the contents of el with them
* @param {String/HTMLElement/Element} el The context element
* @param {Object} o The Dom object spec (and children)
* @param {Boolean} returnElement （可选） true to return a Ext.Element
* @return {HTMLElement} The new node
*/
overwrite : function(el, o, returnElement){
el = Ext.getDom(el);
el.innerHTML = createHtml(o);
return returnElement ? Ext.get(el.firstChild, true) : el.firstChild;
},
/**
* Creates a new Ext.DomHelper.Template from the Dom object spec
* @param {Object} o The Dom object spec (and children)
* @return {Ext.DomHelper.Template} The new template
*/
createTemplate : function(o){
var html = createHtml(o);
return new Ext.Template(html);
}
};
}();
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