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Access to and manipulation of multiple DOM nodes in jQuery typically begins with calling the $ function with a CSS selector string. This returns a jQuery object referencing all the matching elements in the HTML page. $("div.test"), for example, returns a jQuery object with all the div elements that have the class test. This node set can be ...
If your code works with page content and adds event handlers to DOM elements, then, instead of hooking to 'wikipage.content' and looking for elements to attach event listeners to when it is fired, you may attach one event listener to an element outside of the content area or the whole document but filter events by a selector (see jQuery's ...
Keith Clark's Selectivizr is a popular polyfill that makes many CSS3 selectors work in IE 8 and below. It reads the page's stylesheets looking for a number of known CSS3 selectors, then uses a JavaScript selector library to query the document for elements matching those selectors, applying the styles directly to those elements.
The Document Object Model (DOM) is a cross-platform and language-independent interface that treats an HTML or XML document as a tree structure wherein each node is an object representing a part of the document.
Later, JavaScript libraries such as jQuery abstracted away many of the day-to-day difficulties in cross-browser DOM manipulation, though better standards compliance among browsers has reduced the need for this.
Ext JS is a composition of classes that has many capabilities. Some examples: an abstract layer for browsers (e.g. Ext.isArray that can be used as a replacement for Array.isArray)
var x1 = 0; // A global variable, because it is not in any function let x2 = 0; // Also global, this time because it is not in any block function f {var z = 'foxes', r = 'birds'; // 2 local variables m = 'fish'; // global, because it wasn't declared anywhere before function child {var r = 'monkeys'; // This variable is local and does not affect the "birds" r of the parent function. z ...
Various alternatives exist to circumvent this security feature, including using JSONP, Cross-Origin Resource Sharing (CORS) or alternatives with plugins such as Flash or Silverlight (both now deprecated). Cross-origin XMLHttpRequest is specified in W3C's XMLHttpRequest Level 2 specification. [17]