Update AJAX get with checkbox values as they get checked/unchecked

Posted on 2013-12-03
Last Modified: 2013-12-03
I am trying to update an interface by checking/unchecking checkboxes so as the user does this the ajax request gets updated to reflect what's only checked

I have working on it's own meaning, I get all the checkboxes with the right values and the AJAX part is working fine (as in manualy)

My first step is to console.log() what I'm checking/unchecking and Im' getting stuck cause I'm only recording the first checkbox checked.

this is my HTML code:
<input type="checkbox" class="spaceTerm" name="team" value="2011">
<input type="checkbox" class="spaceTerm" name="team" value="2012">
<input type="checkbox" class="spaceTerm" name="team" value="2013">
<input type="checkbox" class="spaceTerm" name="team" value="archive">

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This is my js code:

var termString;
$('.spaceTerm').on("click", function(){
	termString += $(this + ':checked').val();
	console.log(termString + " is checked");

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is not adding or removing values from the string... I guess I'm a little confused on how I should approach this
Question by:vthunder70
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LVL 42

Accepted Solution

Chris Stanyon earned 500 total points
ID: 39692911
Not entirely clear what you need. Are you wanting a single string containing all the values that are checked.

Have at look at this fiddle - I've used an array instead of a string as you'll have more flexibility:

If at some point you're going to submit the form, then you'll need to name your checkboxes as an array (with square brackets), otherwise you'll only ever get the last value:


Then you're receiving script will get an array called team that you can loop through to get the values of those boxes that are ticked

Author Comment

ID: 39692947
The array part makes total sense. The only thing I'm concerned about is that it loops through the whole list every time a box gets clicked.

Wouldn't be better to just push only when one gets checked and search through the array for the one that gets unchecked?

Is this possible?
LVL 42

Expert Comment

by:Chris Stanyon
ID: 39692984
It is possible, but the fastest way to do it is to loop through as I've done. Other wise you would need to run an if/else statement to decide whether to add/remove the value.

Performance really won't be an issue here.

Author Comment

ID: 39693015
I guess I'm splitting hairs... so you are right I don't think performance will be improved by adding/removing values to the array instead of looping through it.

Thank you!
LVL 42

Expert Comment

by:Chris Stanyon
ID: 39693043
No worries. I've been there. Trying to optimize code to such a point that you spend hours writing code only to find out that most humans can't detect a couple of milliseconds difference :)

The each() function in jQuery is already optimized to quickly loop through arrays of elements.

Beside - have you looked into trying to remove an array element by value - not easy!!

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