Solved

AJAX building query string from checkbox array

Posted on 2011-09-26
3
266 Views
Last Modified: 2012-05-12
Hi all,

I'm trying to build a querystring from a check box array.

Here's my AJAX code - the var options and var querystring are the areas I'm guessing I need to flesh out but not quite sure how to do it:

<script language="javascript" type="text/javascript">
<!-- 
//Browser Support Code
function ajaxFunction(){
	var ajaxRequest;  // The variable that makes Ajax possible!
	
	try{
		// Opera 8.0+, Firefox, Safari
		ajaxRequest = new XMLHttpRequest();
	} catch (e){
		// Internet Explorer Browsers
		try{
			ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try{
				ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e){
				// Something went wrong
				alert("Your browser broke!");
				return false;
			}
		}
	}
	// Create a function that will receive data sent from the server
	ajaxRequest.onreadystatechange = function(){
			if(ajaxRequest.readyState == 4){
			document.getElementById('result').innerHTML = ajaxRequest.responseText;
		}
	}
	//Need to grab query string and append checked checkboxes array
	var options = document.get......
	var queryString = "?filter_options=" + options....;
	ajaxRequest.open("GET", "filter_query.php" + queryString, true);
	ajaxRequest.send(null);  
}

//-->
</script>

Open in new window



Here's some checkboxes:

<label for="1"><input type="checkbox" onClick="ajaxFunction();" name="filter_option[]" value="1" id="1">Option 1</label>
<label for="2"><input type="checkbox" onClick="ajaxFunction();" name="filter_option[]" value="2" id="2">Option 2</label>
<label for="3"><input type="checkbox" onClick="ajaxFunction();" name="filter_option[]" value="3" id="3">Option 3</label>

Open in new window


There can be loads of these and I was thinking of sending the string of id's to the server like:
filter_option=1-2-3-4-5-45-34-67-89 and doing an explode() on them before querying.

Lastly, the user arrives at this page with variables in the URL obtained via GET already.

e.g. search.php?qs=My+Search&date=3m


So I have a few questions around this:
A) How can this be achieved?
B) Is this the best way and is this fully browser compliant?
C) How can I include the variables already in the URL in the AJAX call? Write them into it via php?

Huge thanks
David
0
Comment
Question by:dolythgoe
3 Comments
 
LVL 82

Accepted Solution

by:
leakim971 earned 350 total points
ID: 36600799
use :

var checkboxes = document.getElementsByName("filter_option[]");
var queryString = [];
for(var i=0;i<checkboxes.length;i++) {
    if( checkboxes[i].checked ) {
        queryString.push( checkboxes[i].value );
    }
    
}
queryString = "?filter_options=" + queryString.join(",");

Open in new window


test page : http://jsfiddle.net/XekX7/
0
 
LVL 3

Assisted Solution

by:azserrata
azserrata earned 150 total points
ID: 36603584
In order to include the "variables already in URL" into the new URL you could add to leakim971 last line:

prevQS="<?php echo($_SERVER["QUERY_STRING"])?>";
queryString = "?"+prevQS+"&filter_options=" + queryString.join(",");

Open in new window


I believe this should work.

Cheers
David
0
 

Author Closing Comment

by:dolythgoe
ID: 36711193
Huge thanks guys
0

Featured Post

Microsoft Certification Exam 74-409

Veeam® is happy to provide the Microsoft community with a study guide prepared by MVP and MCT, Orin Thomas. This guide will take you through each of the exam objectives, helping you to prepare for and pass the examination.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction A frequently asked question goes something like this:  "I am running a long process in the background and I want to alert my client when the process finishes.  How can I send a message to the browser?"  Unfortunately, the short answer …
Introduction Since I wrote the original article about Handling Date and Time in PHP and MySQL (http://www.experts-exchange.com/articles/201/Handling-Date-and-Time-in-PHP-and-MySQL.html) several years ago, it seemed like now was a good time to updat…
This Micro Tutorial demonstrates using Microsoft Excel pivot tables, how to reverse engineer competitors' marketing strategies through backlinks.
This video shows how to quickly and easily add an email signature for all users on Exchange 2016. The resulting signature is applied on a server level by Exchange Online. The email signature template has been downloaded from: www.mail-signatures…

777 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question