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up vote 2 down vote favorite 
var abc = new Array('Perth','Auckland');

case '1':
    document.getElementById(q15).options.length = 0;
    for (i = 0; i < abc.length; i++) {
        createOption(document.getElementById(q15), abc[i], abc.[i]);
    }
break;

var opt = document.createElement('option');
    opt.value = value;
    opt.text = text;
ddl.options.add(opt);

The above code outputs the following:

<option value="1">Perth</option>
<option value="2">Auckland</option>

However, I need to add some PHP to calculate if the option is selected when the page loads, so the output should look something like this:

<option value="1" <?php if ($results['abc']==1) echo "selected";?>>Perth</option>
<option value="2" <?php if ($results['abc']==2) echo "selected";?>>Auckland</option>

However, I'm struggling with the Selected option in the Javascript to add this an option and add it to the drop down list.

Any help appreciated.

Thanks,

H.

share|improve this question
Did you provide all of the javascript code, because I tried to read it, and only bits and pieces of it makes sense... :P – Kevin Johnson Aug 19 '12 at 14:56
what do you mean by "struggling"? what is the challenge? – codingbiz Aug 19 '12 at 15:03
The challenge is that when the page loads, if a drop down option has already been selected (saved in a DB) then when the page loads, the option is auto selected. It works fine when I code in the Drop downs manually but I need this to happen when I'm using Javascript to populate and create the Drop Downs. – Homer_J Aug 19 '12 at 15:20

2 Answers

up vote 1 down vote accepted

Two things,

First,

You can set the selected attribute using JavaScript by doing domelement.setAttribute("selected","selected");

I think that is what your original question is about.

Second,

You can't add PHP code using javascript, because PHP runs at the server before your browser gets the code.

I'd use PHP to store the $results variable into a javascript variable and use that to set selected.

var results = ["<?php echo implode ('","', $results); ?>"]   /*Get the results array from PHP to javascript.*/


var abc = new Array('Perth','Auckland');

case '1':
    document.getElementById(q15).options.length = 0;
    for (i = 0; i < abc.length; i++) {
        createOption(document.getElementById(q15), abc[i], abc.[i]);
    }
break;

var opt = document.createElement('option');
    opt.value = value;
    opt.text = text;
ddl.options.add(opt);
/*add the "selected" attribute to options that results['abc'] == <number>*/
share|improve this answer
Thanks - figured that might be the case. – Homer_J Aug 19 '12 at 14:52
Thanks Kevin - will have a play shortly. – Homer_J Aug 19 '12 at 15:07
Ah, historic and inherited code :-) – Homer_J Aug 19 '12 at 15:08
If it works, don't forget to accept/upvote! :) – Kevin Johnson Aug 19 '12 at 15:10
Will do - it'll be a while but left page open to ensure I do. – Homer_J Aug 19 '12 at 15:19
show 5 more comments
up vote 0 down vote

Where is $results coming from? If it's something you are operating on in the PHP logic during page creation, then I assume you're specifically asking about why the select item isn't properly being selected? 

<option value="1" <?php if ($results['abc']==1) echo "selected";?>>Perth</option>

That should actually be setting the selected attribute to the value "selected" (rather than just printing selected word alone). So, it should be:

<option value="1" <?php if ($results['abc']==1) echo "selected=\"selected\"";?>>Perth</option>
share|improve this answer
I think that @Homer_J is trying to create the attributes using JavaScript. – Kevin Johnson Aug 19 '12 at 15:05
Correct Kevin, via Javascript. – Homer_J Aug 19 '12 at 15:08
Sorry for the misunderstanding guys. I'm new here, so what's proper etiquette? (i.e., delete my answer entirely?) – techn1cs Aug 22 '12 at 1:32

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