ssrs data matrix Accessing DOM Elements in Font

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Accessing DOM Elements
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Before you get started manipulating elements in the DOM, you need to know the various methods for accessing different elements. There are many ways to achieve this, so here we will just look at the most common methods.
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document.getElementById
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This is probably one of the functions that you will use the most. If you want to access a specific element (be it a div, a link, or an image), you can simply assign it an ID, and then pass that ID to this method.
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CHAPTER 14 THE DOM
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An ID should only ever be used once in a single document; therefore, calling this method should only ever refer to at most one element. If you have more than one element sharing a given ID, the first element found is returned. Consider the following HTML snippet:
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<input type="text" name="foo" id="myFoo" value="bar" /> <script type="text/javascript"> var elt = document.getElementById('myFoo'); if (elt) alert(elt.value); </script>
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This code finds the text input element, and then shows its value in an alert box. A simple check is done here to see if the element was indeed found.
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getElementsByTagName
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This function returns a collection of elements (rather than just a single element) based on the type of tag it references. You can then loop over each element as required. For instance, it you wanted to find all the links in a page and make them bold, you could use the following code:
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<a href="#">Foo</a> <script type="text/javascript"> var links = document.getElementsByTagName('a'); for (var i = 0; i < links.length; i++) { links[i].style.fontWeight = 'bold'; } </script>
You can also call this method on a specific element rather than just the document object. For example, if you wanted to retrieve the names of all of the images within a specific div, you could combine the use of getElementsByTagName with getElementById:
<div id="myDiv"> <img src="foo.jpg" /> </div> <script type="text/javascript"> var theDiv = document.getElementById('myDiv'); var theImages = theDiv.getElementsByTagName('img');
CHAPTER 14 THE DOM
for (var i = 0; i < theImages.length; i++) { alert(theImages[i].src);} } </script>
Accessing Elements Within a Form
Another useful feature of the DOM is the ability to easily access elements within a form, simply by using the element s name attribute on the form object. This can make validation of forms or accessing of different values very easy. For instance, the following simple example will display a JavaScript alert box containing the value of the text input box.
<form id="myForm"> <input type="text" name="foo" value="bar" /> </form> <script type="text/javascript"> var theForm = document.getElementById('myForm'); alert(myForm.foo.value); </script>
Adding and Removing DOM Elements
By controlling the DOM using JavaScript, it is possible to add new elements to a web page without having to use a page refresh. This can be handy for creating elements such as menus, tool tips, and auto-complete features, and is a little more advanced than the generic hide/show method. While hiding and showing elements works well, the ability to create, manipulate, and remove elements on the fly means that you do not have to create the elements from the start; you can work with them as you see fit. Creating elements in JavaScript involves using the document.createElement() method. By passing in the type of element you want to create (by referencing its HTML tag), you can dynamically set up an element on the screen. You can then manipulate it however you see fit. The following snippet shows how this can be accomplished:
<style type="text/css"> .newdiv { background : #f00; border : 1px solid #000; width : 50px; height : 50px } </style>
CHAPTER 14 THE DOM
<a href="#" onclick="createDiv()">Create a div</a> <script type="text/javascript"> //Function to create a new div element. function createDiv() { // Create the div. var mydiv = document.createElement('div'); // Set the div's class. mydiv.className = 'newdiv'; // Append the div to the body. document.body.appendChild(mydiv); } </script>
As you can see, there are several steps involved in creating a new element to add to your HTML page. First, you create the HTML element using createElement. In this case, you created a div, but if you wanted to create a link instead, you would pass a as the argument to createElement. Once the new element has been created, you can manipulate its properties. In the preceding code, you change its class by changing the className property. This means that if you have a class called newdiv in your CSS stylesheet, it will be used to determine the look of the div (after it has been added to your document). Different types of elements have different properties. For instance, if you created a link, you would then set the href property to determine the link target. Once you are finished working with the new element, you use the appendChild() method to add the div to the appropriate element. In this case, you want to add it to the main body of the document, so the appendChild() method is called from document.body. Note that this adds it as the last item within that element (so if there were other items within the element, the new div would appear after these). If you wanted to add it within, say, another div, you could access the div using getElementById, and then call appendChild() on that element (instead of on body). In addition to creating new elements, you can also remove elements from a page. Just like you had to add a new element to an existing element in the page, you must also use an existing element from which to remove the element. Thankfully, this can be achieved fairly simply using your unwanted element s parentNode attribute, along with the removeChild() method.
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