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Clientside script

sundar sankaran
Greenhorn

Joined: Aug 10, 2004
Posts: 10
Javascript code will be executed on clientside. What happen when user disable the javascript? Whether all the browser will run the Ajax code???
Eric Pascarello
author
Rancher

Joined: Nov 08, 2001
Posts: 15376
    
    6
Lets see...Ajax = JavaScript

JavaScript Disabled = JavaScript does not run

SO since Ajax = JavaScript that means you already answered your question.

I think there is a better quesiton in this saying: If the user disables JavaScript, what steps can I take as a developer to make sure that these users are not let out in the cold?

Now that is a better question!

Eric
Neerav Narielwala
Ranch Hand

Joined: Dec 08, 2006
Posts: 106
The solution: <noscript> and <meta> tags.

I place the following in the HTML Head Content (inside the <head> tag for you web-heads out there that, like me, hand-write your own DHTML!):

<noscript>
<meta http-equiv="refresh" content="0;url=status.html">
</noscript>
The <noscript> tag, as per W3Schools.com is described below:

"The noscript element is used to define an alternate content (text) if a script is NOT executed.

This tag is used for browsers that recognizes the <script> tag, but does not support the script in it."
So what we're doing here is redirecting the user agent based on their ability to recognize the <script> tag, but failure to do anything about it (due to, for example, the user agents lack of functionality which you'll find in some WAP/Mobile browsers, or a very capable user agent with Javascript disabled).

As for the destination (read: now that I know you can't use my beautiful UI, where do I send you?!), this is where Google and I part company. Google Maps simply redirects to a page that tells the user that their browser is not currently supported - which IMHO will only confuse the user, as if they only disabled Javascript on their browser, they're likely to find their browser amongst the "Support Browsers" listing. No, I recommend a modification of another method I talked about a while back: An Attempt at Dynamic Content via Javascript

Using this method, you can have your application redirect to status.html with various "status codes", yielding various dynamic/context-sensitive messages to the user agent. Of course, this heavily utilizes Javascript, but you can display the following as the default content in your status.html:

If Javascript is disabled or otherwise not available, the innerHTML of the content container is not changed, and therefore this message is displayed to the user and becomes a reliable redirect/status/landing area for your web-based applications!


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Eric Pascarello
author
Rancher

Joined: Nov 08, 2001
Posts: 15376
    
    6
And what if Meta Refresh is disabled.

If you want to see something interesting. Goto Google's Gmail with JavaScript disabled. That is all Ajax based and it works!

Eric
 
 
subject: Clientside script