Read or Download Professional JavaScript Frameworks: Prototype,YUI, ExtJS, Dojo and MooTools (Wrox Programmer to Programmer) PDF

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Extra info for Professional JavaScript Frameworks: Prototype,YUI, ExtJS, Dojo and MooTools (Wrox Programmer to Programmer)

Example text

12 Download from Library of Wow! remove(); }; removeRow(); replace Replace takes away the element specified and replaces it with the content provided. This removes the element and its children from the DOM. replace(“

Replaced Content

”); }, 1000); update Update replaces the content of an element with the specified content. It does not remove the element from the DOM, although it does remove any children of the element. update(“updated the content”); }, 1000); 13 Download from Library of Wow!

The viewportOffset method returns the offset of the element relative to the viewport. getOffsetParent This method returns the nearest positioned ancestor of the element, and returns the body element if no other ancestor is found. The following code illustrates how the different offsets are calculated. In it, you have two elements: a parent DIV with one child. The parent has its position set to absolute and is positioned 240 pixels from the top and 50 pixels from the left side of the document. When you call the getOffsetParent method of the element with the ID of start, the positioned element positionedParent is returned.

If no element can be found that matches the criteria you define, undefined is returned. Each method accepts two arguments: a CSS selector or a numeric index. If no argument is passed, the first element matching the criteria is returned. If an index is passed, the element at that position in the element’s corresponding array is returned. For example, the resulting array used for the down() method will match the element’s descendants array. If a CSS selector is passed in, the first element that matches that rule is returned.

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