The DomHelper class provides a layer of abstraction from DOM and transparently supports creating
- * elements via DOM or using HTML fragments. It also has the ability to create HTML fragment templates
- * from your DOM building code.
- *
- *
DomHelper element specification object
- *
A specification object is used when creating elements. Attributes of this object
- * are assumed to be element attributes, except for 4 special attributes:
- *
- *
tag :
The tag name of the element
- *
children : or cn
An array of the
- * same kind of element definition objects to be created and appended. These can be nested
- * as deep as you want.
- *
cls :
The class attribute of the element.
- * This will end up being either the "class" attribute on a HTML fragment or className
- * for a DOM node, depending on whether DomHelper is using fragments or DOM.
- *
html :
The innerHTML for the element
- *
- *
- *
Insertion methods
- *
Commonly used insertion methods:
- *
- *
{@link #append} :
- *
{@link #insertBefore} :
- *
{@link #insertAfter} :
- *
{@link #overwrite} :
- *
{@link #createTemplate} :
- *
{@link #insertHtml} :
- *
- *
- *
Example
- *
This is an example, where an unordered list with 3 children items is appended to an existing
- * element with id 'my-div':
-
-var dh = Ext.DomHelper; // create shorthand alias
-// specification object
-var spec = {
- id: 'my-ul',
- tag: 'ul',
- cls: 'my-list',
- // append children after creating
- children: [ // may also specify 'cn' instead of 'children'
- {tag: 'li', id: 'item0', html: 'List Item 0'},
- {tag: 'li', id: 'item1', html: 'List Item 1'},
- {tag: 'li', id: 'item2', html: 'List Item 2'}
- ]
-};
-var list = dh.append(
- 'my-div', // the context element 'my-div' can either be the id or the actual node
- spec // the specification object
-);
-
- *
Element creation specification parameters in this class may also be passed as an Array of
- * specification objects. This can be used to insert multiple sibling nodes into an existing
- * container very efficiently. For example, to add more list items to the example above:
The real power is in the built-in templating. Instead of creating or appending any elements,
- * {@link #createTemplate} returns a Template object which can be used over and over to
- * insert new elements. Revisiting the example above, we could utilize templating this time:
- *
-// create the node
-var list = dh.append('my-div', {tag: 'ul', cls: 'my-list'});
-// get template
-var tpl = dh.createTemplate({tag: 'li', id: 'item{0}', html: 'List Item {0}'});
-
-for(var i = 0; i < 5, i++){
- tpl.append(list, [i]); // use template to append to the actual node
-}
- *
Templates are applied using regular expressions. The performance is great, but if
- * you are adding a bunch of DOM elements using the same template, you can increase
- * performance even further by {@link Ext.Template#compile "compiling"} the template.
- * The way "{@link Ext.Template#compile compile()}" works is the template is parsed and
- * broken up at the different variable points and a dynamic function is created and eval'ed.
- * The generated function performs string concatenation of these parts and the passed
- * variables instead of using regular expressions.
- *
-var html = '{text}';
-
-var tpl = new Ext.DomHelper.createTemplate(html);
-tpl.compile();
-
-//... use template like normal
- *
- *
- *
Performance Boost
- *
DomHelper will transparently create HTML fragments when it can. Using HTML fragments instead
- * of DOM can significantly boost performance.
- *
Element creation specification parameters may also be strings. If {@link #useDom} is false,
- * then the string is used as innerHTML. If {@link #useDom} is true, a string specification
- * results in the creation of a text node. Usage:
- *
-Ext.DomHelper.useDom = true; // force it to use DOM; reduces performance
- *
The DomHelper class provides a layer of abstraction from DOM and transparently supports creating
+ * elements via DOM or using HTML fragments. It also has the ability to create HTML fragment templates
+ * from your DOM building code.
+ *
+ *
DomHelper element specification object
+ *
A specification object is used when creating elements. Attributes of this object
+ * are assumed to be element attributes, except for 4 special attributes:
+ *
+ *
tag :
The tag name of the element
+ *
children : or cn
An array of the
+ * same kind of element definition objects to be created and appended. These can be nested
+ * as deep as you want.
+ *
cls :
The class attribute of the element.
+ * This will end up being either the "class" attribute on a HTML fragment or className
+ * for a DOM node, depending on whether DomHelper is using fragments or DOM.
+ *
html :
The innerHTML for the element
+ *
+ *
+ *
Insertion methods
+ *
Commonly used insertion methods:
+ *
+ *
{@link #append} :
+ *
{@link #insertBefore} :
+ *
{@link #insertAfter} :
+ *
{@link #overwrite} :
+ *
{@link #createTemplate} :
+ *
{@link #insertHtml} :
+ *
+ *
+ *
Example
+ *
This is an example, where an unordered list with 3 children items is appended to an existing
+ * element with id 'my-div':
+
+var dh = Ext.DomHelper; // create shorthand alias
+// specification object
+var spec = {
+ id: 'my-ul',
+ tag: 'ul',
+ cls: 'my-list',
+ // append children after creating
+ children: [ // may also specify 'cn' instead of 'children'
+ {tag: 'li', id: 'item0', html: 'List Item 0'},
+ {tag: 'li', id: 'item1', html: 'List Item 1'},
+ {tag: 'li', id: 'item2', html: 'List Item 2'}
+ ]
+};
+var list = dh.append(
+ 'my-div', // the context element 'my-div' can either be the id or the actual node
+ spec // the specification object
+);
+
+ *
Element creation specification parameters in this class may also be passed as an Array of
+ * specification objects. This can be used to insert multiple sibling nodes into an existing
+ * container very efficiently. For example, to add more list items to the example above:
The real power is in the built-in templating. Instead of creating or appending any elements,
+ * {@link #createTemplate} returns a Template object which can be used over and over to
+ * insert new elements. Revisiting the example above, we could utilize templating this time:
+ *
+// create the node
+var list = dh.append('my-div', {tag: 'ul', cls: 'my-list'});
+// get template
+var tpl = dh.createTemplate({tag: 'li', id: 'item{0}', html: 'List Item {0}'});
+
+for(var i = 0; i < 5, i++){
+ tpl.append(list, [i]); // use template to append to the actual node
+}
+ *
Templates are applied using regular expressions. The performance is great, but if
+ * you are adding a bunch of DOM elements using the same template, you can increase
+ * performance even further by {@link Ext.Template#compile "compiling"} the template.
+ * The way "{@link Ext.Template#compile compile()}" works is the template is parsed and
+ * broken up at the different variable points and a dynamic function is created and eval'ed.
+ * The generated function performs string concatenation of these parts and the passed
+ * variables instead of using regular expressions.
+ *
+var html = '{text}';
+
+var tpl = new Ext.DomHelper.createTemplate(html);
+tpl.compile();
+
+//... use template like normal
+ *
+ *
+ *
Performance Boost
+ *
DomHelper will transparently create HTML fragments when it can. Using HTML fragments instead
+ * of DOM can significantly boost performance.
+ *
Element creation specification parameters may also be strings. If {@link #useDom} is false,
+ * then the string is used as innerHTML. If {@link #useDom} is true, a string specification
+ * results in the creation of a text node. Usage:
+ *
+Ext.DomHelper.useDom = true; // force it to use DOM; reduces performance
+ *
'+tbe;
+
+ // private
+ function doInsert(el, o, returnElement, pos, sibling, append){
+ var newNode = pub.insertHtml(pos, Ext.getDom(el), createHtml(o));
+ return returnElement ? Ext.get(newNode, true) : newNode;
+ }
+
+ // build as innerHTML where available
+ function createHtml(o){
+ var b = '',
+ attr,
+ val,
+ key,
+ cn;
+
+ if(typeof o == "string"){
+ b = o;
+ } else if (Ext.isArray(o)) {
+ for (var i=0; i < o.length; i++) {
+ if(o[i]) {
+ b += createHtml(o[i]);
+ }
+ };
+ } else {
+ b += '<' + (o.tag = o.tag || 'div');
+ for (attr in o) {
+ val = o[attr];
+ if(!confRe.test(attr)){
+ if (typeof val == "object") {
+ b += ' ' + attr + '="';
+ for (key in val) {
+ b += key + ':' + val[key] + ';';
+ };
+ b += '"';
+ }else{
+ b += ' ' + ({cls : 'class', htmlFor : 'for'}[attr] || attr) + '="' + val + '"';
+ }
+ }
+ };
+ // Now either just close the tag or try to add children and close the tag.
+ if (emptyTags.test(o.tag)) {
+ b += '/>';
+ } else {
+ b += '>';
+ if ((cn = o.children || o.cn)) {
+ b += createHtml(cn);
+ } else if(o.html){
+ b += o.html;
+ }
+ b += '';
+ }
+ }
+ return b;
+ }
+
+ function ieTable(depth, s, h, e){
+ tempTableEl.innerHTML = [s, h, e].join('');
+ var i = -1,
+ el = tempTableEl,
+ ns;
+ while(++i < depth){
+ el = el.firstChild;
+ }
+// If the result is multiple siblings, then encapsulate them into one fragment.
+ if(ns = el.nextSibling){
+ var df = document.createDocumentFragment();
+ while(el){
+ ns = el.nextSibling;
+ df.appendChild(el);
+ el = ns;
+ }
+ el = df;
+ }
+ return el;
+ }
+
+ /**
+ * @ignore
+ * Nasty code for IE's broken table implementation
+ */
+ function insertIntoTable(tag, where, el, html) {
+ var node,
+ before;
+
+ tempTableEl = tempTableEl || document.createElement('div');
+
+ if(tag == 'td' && (where == afterbegin || where == beforeend) ||
+ !tableElRe.test(tag) && (where == beforebegin || where == afterend)) {
+ return;
+ }
+ before = where == beforebegin ? el :
+ where == afterend ? el.nextSibling :
+ where == afterbegin ? el.firstChild : null;
+
+ if (where == beforebegin || where == afterend) {
+ el = el.parentNode;
+ }
+
+ if (tag == 'td' || (tag == 'tr' && (where == beforeend || where == afterbegin))) {
+ node = ieTable(4, trs, html, tre);
+ } else if ((tag == 'tbody' && (where == beforeend || where == afterbegin)) ||
+ (tag == 'tr' && (where == beforebegin || where == afterend))) {
+ node = ieTable(3, tbs, html, tbe);
+ } else {
+ node = ieTable(2, ts, html, te);
+ }
+ el.insertBefore(node, before);
+ return node;
+ }
+
+
+ pub = {
+ /**
+ * 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 e.g. 'width:100px', or object in the form {width:'100px'}, or
+ * a function which returns such a specification.
+ */
+ applyStyles : function(el, styles){
+ if (styles) {
+ var matches;
+
+ el = Ext.fly(el);
+ if (typeof styles == "function") {
+ styles = styles.call();
+ }
+ if (typeof styles == "string") {
+ /**
+ * Since we're using the g flag on the regex, we need to set the lastIndex.
+ * This automatically happens on some implementations, but not others, see:
+ * http://stackoverflow.com/questions/2645273/javascript-regular-expression-literal-persists-between-function-calls
+ * http://blog.stevenlevithan.com/archives/fixing-javascript-regexp
+ */
+ cssRe.lastIndex = 0;
+ while ((matches = cssRe.exec(styles))) {
+ el.setStyle(matches[1], matches[2]);
+ }
+ } else if (typeof styles == "object") {
+ el.setStyle(styles);
+ }
+ }
+ },
+
+ /**
+ * 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 fragment
+ * @return {HTMLElement} The new node
+ */
+ insertHtml : function(where, el, html){
+ var hash = {},
+ hashVal,
+ setStart,
+ range,
+ frag,
+ rangeEl,
+ rs;
+
+ where = where.toLowerCase();
+ // add these here because they are used in both branches of the condition.
+ hash[beforebegin] = ['BeforeBegin', 'previousSibling'];
+ hash[afterend] = ['AfterEnd', 'nextSibling'];
+
+ if (el.insertAdjacentHTML) {
+ if(tableRe.test(el.tagName) && (rs = insertIntoTable(el.tagName.toLowerCase(), where, el, html))){
+ return rs;
+ }
+ // add these two to the hash.
+ hash[afterbegin] = ['AfterBegin', 'firstChild'];
+ hash[beforeend] = ['BeforeEnd', 'lastChild'];
+ if ((hashVal = hash[where])) {
+ el.insertAdjacentHTML(hashVal[0], html);
+ return el[hashVal[1]];
+ }
+ } else {
+ range = el.ownerDocument.createRange();
+ setStart = 'setStart' + (endRe.test(where) ? 'After' : 'Before');
+ if (hash[where]) {
+ range[setStart](el);
+ frag = range.createContextualFragment(html);
+ el.parentNode.insertBefore(frag, where == beforebegin ? el : el.nextSibling);
+ return el[(where == beforebegin ? 'previous' : 'next') + 'Sibling'];
+ } else {
+ rangeEl = (where == afterbegin ? 'first' : 'last') + 'Child';
+ if (el.firstChild) {
+ range[setStart](el[rangeEl]);
+ frag = range.createContextualFragment(html);
+ if(where == afterbegin){
+ el.insertBefore(frag, el.firstChild);
+ }else{
+ el.appendChild(frag);
+ }
+ } else {
+ el.innerHTML = html;
+ }
+ return el[rangeEl];
+ }
+ }
+ throw 'Illegal insertion point -> "' + where + '"';
+ },
+
+ /**
+ * Creates new DOM element(s) and inserts them before el.
+ * @param {Mixed} el The context element
+ * @param {Object/String} o The DOM object spec (and children) or raw HTML blob
+ * @param {Boolean} returnElement (optional) true to return a Ext.Element
+ * @return {HTMLElement/Ext.Element} The new node
+ */
+ insertBefore : function(el, o, returnElement){
+ return doInsert(el, o, returnElement, beforebegin);
+ },
+
+ /**
+ * Creates new DOM element(s) and inserts them after el.
+ * @param {Mixed} el The context element
+ * @param {Object} o The DOM object spec (and children)
+ * @param {Boolean} returnElement (optional) true to return a Ext.Element
+ * @return {HTMLElement/Ext.Element} The new node
+ */
+ insertAfter : function(el, o, returnElement){
+ return doInsert(el, o, returnElement, afterend, 'nextSibling');
+ },
+
+ /**
+ * Creates new DOM element(s) and inserts them as the first child of el.
+ * @param {Mixed} el The context element
+ * @param {Object/String} o The DOM object spec (and children) or raw HTML blob
+ * @param {Boolean} returnElement (optional) true to return a Ext.Element
+ * @return {HTMLElement/Ext.Element} The new node
+ */
+ insertFirst : function(el, o, returnElement){
+ return doInsert(el, o, returnElement, afterbegin, 'firstChild');
+ },
+
+ /**
+ * Creates new DOM element(s) and appends them to el.
+ * @param {Mixed} el The context element
+ * @param {Object/String} o The DOM object spec (and children) or raw HTML blob
+ * @param {Boolean} returnElement (optional) true to return a Ext.Element
+ * @return {HTMLElement/Ext.Element} The new node
+ */
+ append : function(el, o, returnElement){
+ return doInsert(el, o, returnElement, beforeend, '', true);
+ },
+
+ /**
+ * Creates new DOM element(s) and overwrites the contents of el with them.
+ * @param {Mixed} el The context element
+ * @param {Object/String} o The DOM object spec (and children) or raw HTML blob
+ * @param {Boolean} returnElement (optional) true to return a Ext.Element
+ * @return {HTMLElement/Ext.Element} The new node
+ */
+ overwrite : function(el, o, returnElement){
+ el = Ext.getDom(el);
+ el.innerHTML = createHtml(o);
+ return returnElement ? Ext.get(el.firstChild) : el.firstChild;
+ },
+
+ createHtml : createHtml
+ };
+ return pub;
+}();
+
+
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