Select all options in Select Box.

Hi.

I think this might be quite an easy one for all the experts out there so here goes..

I have a select box which is dynamically created, but when it's created it is the same as a regular select box, has a name and ID. But it is only populated by about 3 or 4 options (always different when the page loads).

I would like a javascript function (say called on a button press) which then concatenates all options in the box into a var (variable), I will then create a textarea with the one long string of text in the var.

So, the option box will look like this:

[HTML]<SELECT NAME="callnotes" id="callnotes" style="visibility: hidden;">
<option value="VALUE1"></option>
<option value="VALUE2"></option>
<option value="VALUE3"></option>
<option value="VALUE4"></option>
<SELECT> [/HTML]

Then the javascript will create a var which will look like this:
'VALUE1VALUE2VALUE3VALUE4"

Then javascript will polulate a regular text area with the contents or the var.

hope that makes sense, sorry most of it is hypethetical but any straight forward code to create a varialbe based on the concatenated options in a select box would be GREAT!!

Cheers in advance.

Dec 11 '07 #1

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1634

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5,390

Expert Mod 4TB

hi ...

to retrieve the concatenated text you want you may use a function like in the following example:

Expand|Select|Wrap|Line Numbers

 function get_values() {

    var sel  = document.getElementById('callnotes');

    var opts = sel.getElementsByTagName('option');

    var txt  = [];
 
    for (var i = 0; i < opts.length; i++) {

        txt.push(opts[i|.value);

    }
 
    return txt.join('');

}

kind regards

Dec 11 '07 #2

plumba

hi ...

to retrieve the concatenated text you want you may use a function like in the following example:

Expand|Select|Wrap|Line Numbers

function get_values() {

    var sel  = document.getElementById('callnotes');

    var opts = sel.getElementsByTagName('option');

    var txt  = [];

    for (var i = 0; i < opts.length; i++) {

        txt.push(opts[i|.value);

    }

    return txt.join('');

}

kind regards

Many thanks for this, I can see the logic but cant get it working....

At the moment, to prove the concept, I'm calling this function from a standard button in the page and I've added an alert(txt); line to display the concatenated values, but I'm getting an error 'Object doesn't support this property or method', that appears with or without the alert box....

Dec 12 '07 #3

gits

5,390

Expert Mod 4TB

hi ...

there is a syntax-error:

Expand|Select|Wrap|Line Numbers

txt.push(opts[i|.value);

has to be:

Expand|Select|Wrap|Line Numbers

txt.push(opts[i].value);

kind regards

Dec 12 '07 #4

gits

5,390

Expert Mod 4TB

here is a working example:

[HTML]<html>
<head>
<script type="text/javascript">
function get_values() {
var sel = document.getElementById('callnotes');
var opts = sel.getElementsByTagName('option');
var txt = [];

for (var i = 0; i < opts.length; i++) {
txt.push(opts[i].value);
}

return txt.join('');
}
</script>
</head>

<body>
<select id="callnotes">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
<input type="button" value="test" onclick="alert(get_values());"/>
</body>
</html>
[/HTML]

Dec 12 '07 #5

plumba

here is a working example:

[HTML]<html>
<head>
<script type="text/javascript">
function get_values() {
var sel = document.getElementById('callnotes');
var opts = sel.getElementsByTagName('option');
var txt = [];

for (var i = 0; i < opts.length; i++) {
txt.push(opts[i].value);
}

return txt.join('');
}
</script>
</head>

<body>
<select id="callnotes">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
<input type="button" value="test" onclick="alert(get_values());"/>
</body>
</html>
[/HTML]

Great, thank you. From your first post I managed to modify it so it puts the values into a var so I can play around with the results:

[HTML]<script>
function callnotes(){
var notes = document.getElementById('callnotes').options;
var opts = notes.getElementsByTagName('option');
var match = "";

for (i=0; i<opts.length; i++){
match = (match + opts[i].value);
document.getElementById("CallText").value = match;

}
//alert(match);

}
</script>[/HTML]

I do have one more question on this...

When it abtains the first line value it would contain a set number of characters, for example 6, I would like it to be filled with blanks so it takes up 10 characters, then perform the concatenations and run the same theory on the next line, so regardless of how many characters are in the options it pads out the end with spaces so it fills up to 10 characters....

Dec 12 '07 #6

gits

5,390

Expert Mod 4TB

hi ...

you may use the following function for it :)

Expand|Select|Wrap|Line Numbers

 
/**

 * @param val the value to fill

 * @param n no of chars to be filled

 * @param chr character that should be used for the fill

 *

 * @return the filled value

 */

function left_fill_value(val, n, chr) {

    var l = n - val.length;

    var a = [];
 
    if (l > 0) {

        for (var i = 0; i < l; i++) {

            a[i] = chr;

        }

    }
 
    return (a.join('') + val);

}

kind regards

Dec 12 '07 #7

plumba

hi ...

you may use the following function for it :)

Expand|Select|Wrap|Line Numbers

/**

* @param val the value to fill

* @param n no of chars to be filled

* @param chr character that should be used for the fill

*

* @return the filled value

*/

function left_fill_value(val, n, chr) {

    var l = n - val.length;

    var a = [];

    if (l > 0) {

        for (var i = 0; i < l; i++) {

            a[i] = chr;

        }

    }

    return (a.join('') + val);

}

kind regards

Hi, thanks for a speedy response, but I can't quite follow this one.

So, will the above work if say the first var contains 6 characters and the sedond contains 4 characters, will it pad out the first to 10 characters (using blank spaces, then the same with the second before running the concatenation??

Cheers...

Dec 12 '07 #8

gits

5,390

Expert Mod 4TB

exactly ... the call in your code have to look like this:

Expand|Select|Wrap|Line Numbers

 var filled_val = left_fill_value(opts[i].value, 10, '0');
 
match = (match + filled_val);

kind regards

Dec 12 '07 #9

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