3 important Javascript Important interview question with answers

What is javascript?

JavaScript is a programming language which runs inside browsers. They are available in all browsers like IE, Chrome etc.

What is HTML DOM?

DOM is a standard interface by which we can access/ update /add HTML elements.

So how is the DOM structured?

HTML DOM (Document object model) has a hierarchal structure. 

<html>
<body>
<form>
<input type=text name=”txtname” value=”shiv”/>
</form>
</body>
</html>

For example for the above HTML code , below is the DOM hierarchy structure.

javascript

So example if you wish to access the textbox value , you need to write the below JavaScript code.

var x = document.forms[0].txtname.value;

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