PHP and jQuery...

Please comment on the following statements and questions (please don't use yes/no as answer if you can explain it a bit):

A- jQuery makes it easy the use  and replaces javascript manipulation of DOM.
B- Is there some areas jQuery cannot do what javascript does?
C- Can jQuery be utilized in server-side php files? If so, please give an example.

Thank you.
LVL 34
Mike EghtebasDatabase and Application DeveloperAsked:
Who is Participating?
 
Dave BaldwinConnect With a Mentor Fixer of ProblemsCommented:
jQuery is a javascript library.  It does not 'replace' javascript, it is javascript.  jQuery and javascript run in the browser, PHP runs on the server.  jQuery will not run on the server in PHP.  PHP can deliver it to the browser in the HTML output where it can be used.
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Kiran Paul VJConnect With a Mentor Computer EngineerCommented:
A- jQuery makes it easy the use  and replaces javascript manipulation of DOM.

Partially correct. jQuery makes it easy but does not replaces any core JavaScript functions. jQuery is build on top of existing JavaScript functions. jQuery has lot of functions to make DOM manipulations easy. We can do the DOM manipulation with plain JavaScript, in that case we need to write more lines of code and the code has to be compatible with different browser versions. If we are using jQuery, it does all this extra effort and provide us a function, we just need to call this function with correct parameters. In effect jQuery does all the low level programming effort and browser compactability issues, we only need to focus on our application logic.


B- Is there some areas jQuery cannot do what javascript does?

Lots of, thats why jQuery is providing the option to extend it. We can write our on plugins in Javascript or with available jQuery functions on top of jQuery core library.

C- Can jQuery be utilized in server-side php files? If so, please give an example.

Yes and No.

We can write jQuery in PHP files but it will be executed only in client browser environment.

For eg:

something like

<?php
if( $domId == "textbox-my-id") // this is PHP
{
?>
<script>
var getElement = $("#<?php  echo($domId=); ?>"); // This is JS, but will executed only in browser

</script>
<?php
}
?>

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hope this helps,
kiranvj
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Ray PaseurConnect With a Mentor Commented:
A- jQuery makes it easy the use and replaces javascript manipulation of DOM.

jQuery implements the "good parts" of JavaScript in a language framework.  It does not replace any part of JavaScript - it just makes it easier to use.

B- Is there some areas jQuery cannot do what javascript does?

jQuery is a framework that implements JavaScript.  JavaScript can be thought of as a low-level language.  It will have more functionality and will be more customisable than jQuery, but only at a low level.  Both can exists side-by-side in client-side applications.

C- Can jQuery be utilized in server-side php files? If so, please give an example.

No.  It runs on the client, not the server.  But more to the point, jQuery can facilitate communication between the client and the server.  This article shows the "hello world" exercise with a handshake between jQuery on the client and PHP on the server.
http://www.experts-exchange.com/Programming/Languages/Scripting/JavaScript/Jquery/A_10712-The-Hello-World-Exercise-with-jQuery-and-PHP.html
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Mike EghtebasDatabase and Application DeveloperAuthor Commented:
Thank you
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Kiran Paul VJComputer EngineerCommented:
Thx for the points and grade. Good to know it helped.
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