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How To Accessing Elements Using Javascript?

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To do something interesting with HTML elements, we must first be able to uniquely identify which element we want. In the example 

<body>

<form action="">

<input type="button" id="useless" name="mybutton" value="doNothing" />

</form>

</body>

We can use the "getElementById" method (which is generally preferred)

document.getElementById("useless").style.color = "red";

or we can use the older hierarchical navigation method,

document.forms[0].mybutton.style.color = "blue";

Notice that this uses the "name" attribute of the element to locate it.

# Example of Accessing Elements in a DOM.

<script type="text/javascript" >

function showStatus() {

var selectWidget = document.forms.beerForm.elements["beer"];

var myValue = selectWidget.options[selectWidget.selectedIndex].value;

alert('You drank a \"'+ myValue +"\"");

return true;

}

</script>

<form name="beerForm" action="">

<select name="beer">

<option selected="selected">Select Beer</option>

<option>Heineken</option>

<option>Amstel Light</option>

<option>Corona</option>

<option>Corona Light</option>

<option>Tecate</option>

</select>

<input type="button" name="submitbutton" value="Drink"

onclick="showStatus()" />

</form>

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