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dom.js
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dom.js
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/**
* @module dom
* @description some DOM utils
*/
modules.define('dom', ['jquery'], function(provide, $) {
provide(/** @exports */{
/**
* Checks whether a DOM elem is in a context
* @param {jQuery} ctx DOM elem where check is being performed
* @param {jQuery} domElem DOM elem to check
* @returns {Boolean}
*/
contains : function(ctx, domElem) {
var res = false;
domElem.each(function() {
var domNode = this;
do {
if(~ctx.index(domNode)) return !(res = true);
} while(domNode = domNode.parentNode);
return res;
});
return res;
},
/**
* Returns current focused DOM elem in document
* @returns {jQuery}
*/
getFocused : function() {
// "Error: Unspecified error." in iframe in IE9
try { return $(document.activeElement); } catch(e) {}
},
/**
* Checks whether a DOM element contains focus
* @param {jQuery} domElem
* @returns {Boolean}
*/
containsFocus : function(domElem) {
return this.contains(domElem, this.getFocused());
},
/**
* Checks whether a browser currently can set focus on DOM elem
* @param {jQuery} domElem
* @returns {Boolean}
*/
isFocusable : function(domElem) {
var domNode = domElem[0];
if(!domNode) return false;
if(domNode.hasAttribute('tabindex')) return true;
switch(domNode.tagName.toLowerCase()) {
case 'iframe':
return true;
case 'input':
case 'button':
case 'textarea':
case 'select':
return !domNode.disabled;
case 'a':
return !!domNode.href;
}
return false;
},
/**
* Checks whether a domElem is intended to edit text
* @param {jQuery} domElem
* @returns {Boolean}
*/
isEditable : function(domElem) {
var domNode = domElem[0];
if(!domNode) return false;
switch(domNode.tagName.toLowerCase()) {
case 'input':
var type = domNode.type;
return (type === 'text' || type === 'password') && !domNode.disabled && !domNode.readOnly;
case 'textarea':
return !domNode.disabled && !domNode.readOnly;
default:
return domNode.contentEditable === 'true';
}
}
});
});