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Shaadi.com Matrimonials
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Important Questions: E-Commerce -
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Q49. What can a JavaScript
Do?
Ans. 1.JavaScript gives HTML designers a programming tool - HTML authors
are normally not programmers, but JavaScript is a scripting language
with a very simple syntax! Almost anyone can put small "snippets" of
code into their HTML pages
2. JavaScript can put dynamic text into an HTML page - A JavaScript
statement like this: document.write("<h1>" + name + "</h1>") can write a
variable text into an HTML page
3. JavaScript can react to events - A JavaScript can be set to execute
when something happens, like when a page has finished loading or when a
user clicks on an HTML element
4. JavaScript can read and write HTML elements - A JavaScript can read
and change the content of an HTML element
5. JavaScript can be used to validate data - A JavaScript can be used to
validate form data before it is submitted to a server. This saves the
server from extra processing
6. JavaScript can be used to detect the visitor's browser - A JavaScript
can be used to detect the visitor's browser, and - depending on the
browser - load another page specifically designed for that browser
7. JavaScript can be used to create cookies - A JavaScript can be used
to store and retrieve information on the visitor's computer |
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Q50. How to Put a JavaScript
Into an HTML Page?
Ans. <html>
<body>
<script type="text/javascript">
document.write("Hello World!");
</script>
</body>
</html>
Q51. How to Use an External JavaScript?
Ans. Sometimes you might want to run the same JavaScript on several
pages, without having to write the same script on every page.
<html>
<head>
<script src="xxx.js"></script>
</head>
<body>
</body>
</html>
Q52. What are javascript functions?
Ans. A function contains code that will be executed by an event or by a
call to that function.
You may call a function from anywhere within the page (or even from
other pages if the function is embedded in an external .js file).
Functions can be defined both in the <head> and in the <body> section of
a document. However, to assure that the function is read/loaded by the
browser before it is called, it could be wise to put it in the <head>
section. |
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Q53. Write example of
function.
Ans. <html>
<head>
<script type="text/javascript">
function myfunction()
{
alert("HELLO");
}
</script>
</head>
<body>
<form>
<input type="button"
onclick="myfunction()"
value="Call function">
</form>
<p>By pressing the button, a function will be called. The function will
alert a message.</p>
</body>
</html> |
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