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Intergrating AJAX Technology Into Your Modifications
This How-To will show you how to use the defined AJAX functions within vBulletin so developers can see how easily it is to intergrate AJAX technology into modifictions. Please note this tutorial is aimed at developers with some javascript knowledge. Step 1 - Understand AJAX: As many of you will know, AJAX gives the ability to pass data through a stream and recieve any data returned with no reloading, so if you're thinking of intergrating AJAX then you must first have a scenario where you wish to push data and recieve it, recieval is not required however is probably the best part of AJAX in a users opinion due to the dynamic changes that occur to present the recieved data. Step 2 - Setting Up AJAX: Okay, so you want to set up AJAX, real easy, the first step is to create an AJAX Object, this can be done with ease using the vBulletin set-up, an example is below: Code:
My_AJAX_Object = new vB_AJAX_Handler(true); So now you have your AJAX Object set up, before firing data you'll need to to set the object to respond to a function for when it recieves data, an example is below: Code:
My_AJAX_Object.onreadystatechange(My_AJAX_Reciever); Code:
function My_AJAX_Reciever() { if (My_AJAX_Object.handler.readyState == 4 && My_AJAX_Object.handler.status == 200 && My_AJAX_Object.handler.responseText) { alert('Data recieved successfully\n\n' + My_AJAX_Object.handler.responseText) } } Step 3 - Firing And Recieving Data: So now you want to fire some data through AJAX, and get some back, let's first look how we fire data: Code:
My_AJAX_Object.send('myfile.php', 'do=ajax&pagevar=text'); In most cases your post variables (parameter 2) would fluxuate, and you may want to send some variables that users have inputted, if so you may want to take advantage of vBulletin's javascript emulation of urlencode(), first off you'd parse the variable in javascript before firing off, as shown below: Code:
My_Variable = PHP.urlencode(My_Variable); PHP Code:
PHP Code:
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Remember, to grab using AJAX what PHP outputted, the code is My_AJAX_Object.responseText Final Line - Handling Data and Dynamics: So you've managed to successfully fire some data off, and got some back, now you want to fiddle with it in Javascript and make changes to your page? Then i'm afraid you're on your own for that job, how you handle the recieved data is completely upto you and the scenario you're using AJAX in. If you wish to see more information on AJAX, i suggest you look at this tutorial i wrote a while ago for vBulletin.org, it includes more information on AJAX than posted here https://vborg.vbsupport.ru/showthread.php?t=81626 Any questions/problems reply here and i'll try to resolve them for you, the code above is all written off the top of my head, but i don't see any errors myself, feel free to report them to me though - Zero Tolerance |
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Thank you!!
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Yep, thanks for the toot.
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Asynchronously: Processing is done in the backround and allows the user to use do other things on the page while the request is begin made and returned. You should use this is most cases Synchronously: Page is 'locked' until request is made and data is returned to the browser. This should not be used often because if there is a connection timeout or other issues the user will be left with a page that will not function. |
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excellent info! thanks
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This helps a lot, thanks!
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I have a question/problem. I've read this over and over untill my eyes hurt, and I can't seem to get it to work. Here is the code I'm using:
test.js includes: Code:
My_AJAX_Object = new vB_AJAX_Handler(true); My_AJAX_Object.onreadystatechange(My_AJAX_Reciever); function My_AJAX_Reciever() { if (My_AJAX_Object.readyState == 4 && My_AJAX_Object.status == 200 && My_AJAX_Object.responseText) { alert('Data recieved successfully\n\n' + My_AJAX_Object.responseText) } } My_Variable = PHP.urlencode(My_Variable); My_AJAX_Object.send('test.php', 'do=ajax&pagevar=text'); PHP Code:
I don't understand what I place in the HTML part? Could you please show some code example. The PHP/Java/HTML. Thanks |
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Code:
My_Variable = PHP.urlencode(My_Variable); Also the HTML would just include the JS file, ie: HTML Code:
<script type="text/javascript" src="clientscript/test.js"></script> - Zero Tolerance |
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Thanks Scott, I've been reading alot of tutorials, and I've been studying your code with your shoutbox hack. I'm slowly getting the hang of it, but it is going to take alot of time.
I'm in the middle of a project and I am making the core of the project all ajax. I've figured out how to do a few things; one thing I?m trying to do is open new pages without reload. I see GMail does that, and I believe it has to do with Iframes, but I?m not sure. I'll get it eventually, I've pored many late nights reading so, I better get it soon! |
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LiveWire i think it has more to do with DIVs than iFrames....but i could be wrong. |
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