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How it works... use none none development toassign none in none Microsoft Office Excel Website The region function none none uses the YAHOO.util.Dom.

getStyle function to fetch the top, right, bottom, and left styles of an element. Using those values the function computes the width and height of the region..

2 . These are the prope none none rties available on a region:. Name 0 1 bottom hei ght left right top width x y Value The left position of region The top position of region The bottom position of region The difference between bottom and top positions The left position of region The right position of region The top position of region The difference between right and left positions The left position of region The top position of region. There"s more... This recipe used an ID to reference the DOM node, but YAHOO.util.Dom.

getRegion functions can also accept a DOM element instead of an ID, or an array of elements.. Using advanced YAHOO.util.Dom functions These recipes show how to use the miscellaneous other functions that are available on YAHOO.util.Dom.

. How to do it... Most of the YAHOO.u til.Dom functions can accept either a single HTML element or an array of elements.

The YAHOO.util.Dom.

batch function is used by the other functions to achieve this, and may be useful for working with element arrays in your own projects. This is the pattern used by YUI to iterate on an array of elements:. YAHOO.util.Dom.

getS none none tyle = function(el, property) { return YAHOO.util.Dom.

batch(el, Y.Dom._getStyle, property); }; YAHOO.

util.Dom._getStyle = function(el, property) { /* .

.. */ };.

Using YAHOO.util.Do m Generate unique IDs for your elements with prefix "yui-gen":.

var node = YAHOO.ut none for none il.Dom.

get("myNodeId"); var parentNodeId = YAHOO.util.Dom.

generateId(node.parentNode);. Generate unique IDs for your elements with your own prefix:. var node = YAHOO.ut none none il.Dom.

get("myNodeId"); YAHOO.util.Dom.

generateId(node.parentNode, "my-prefix");. Evaluate if a node belongs to a document:. YAHOO.util.Dom.

inDo none none cument("myNodeId", myDocument);. Insert a node after a reference node:. var inode = documen none none t.createElement("p"); var node = YAHOO.util.

Dom.insertAfter(inode, "referenceNodeId");. Insert a node befor e a reference node:. var inode = documen none for none t.createElement("p"); var node = YAHOO.util.

Dom.insertBefore(inode, "referenceNodeId");. How it works... The YAHOO.util.Dom.

none for none batch and YAHOO.util.Dom.

generateId function can accept a single element or an array of elements. The batch function is used to iterate on an element or array of elements, while executing the supplied function passed as its second argument. It passes the element and any object provided as the third argument of batch when calling the supplied function.

If you pass true in as the fourth argument, then the supplied function will execute in the context of the objected provided as the third argument of the batch function. The YAHOO.util.

Dom.generateId function adds a new unique ID to the element, as long as it does not already have one. It ensures uniqueness by using a counter variable that is incremented each time the function executes and then checks the DOM to see if the ID is already in use.

The YAHOO.util.Dom.

insertBefore function wraps the native insertBefore function, so that you do not need to call the elements parent node. The function inserts the first argument to the DOM just before the second argument, so that the first argument is the previousSibling of the second. The YAHOO.

util.Dom.insertAfter function does not natively exist in JavaScript, but is a useful addition.

The function inserts the first argument to the DOM just after the second argument, so that the first argument is the nextSibling of the second.. 2 . There"s more... This recipe used ID s to reference DOM nodes, but these functions can all also accept DOM elements instead of IDs. YUI sometimes calls YAHOO.util.

Dom.generateId to add ID attributes to elements when performing certain DOM operations, so while debugging you might find that some of your DOM elements have YUI generated Ids..

Using YAHOO.util.Selector to search the DOM The YAHOO.util.Sele ctor component provides functions to search the DOM by using CSS selectors.

This recipe shows how to search using the basic CSS 1 selectors.. How to do it... Search by tag name:. // find all script none for none tags inside of the body tag var nodes = YAHOO.util.Selector.

query("body script");. Search by class name:. // find all anchor none none tags with the class name "myClass" var nodes = YAHOO.util.Selector.

query("a.myClass");. Search by element id:. // find all anchors none for none inside of the element with "myNodeId" as its id var nodes = YAHOO.util.Selector.

query("# myNodeId a");. Search inside of an element:. // find all anchors none for none inside of the provided element var myElement = YAHOO.util.Dom.

get("myNodeId"); var nodes = YAHOO.util.Selector.

query("a", myElement);.
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