kevinold@gmail.com wrote:[color=blue]
> Hello everyone,
>
> I'm using the prototype.js libaries and am trying to parse a select
> element that has been filled in via an ajax call (returning html of
> <options>). I'm trying to loop through all the elements and set the
> selectedIndex of the element, but it doesn't seem to be working.
> Here's the code snippet. Let me know if I need to post more code:
>
> var the_model = 'thunderbird';[/color]
Here you set a global variable with a value of 'thunderbird'...
[color=blue]
> function setModel(the_model) {[/color]
Here you create a local variable with the same name as a global variable
- it will mask the global when you call the function. Presumably you
are calling this with:
setModel('thunderbird');
in which case the global should be removed. If you expect the function
to use the global variable, remove the parameter from the function
declaration:
function setModel() {
and call it with:
setModel();
[color=blue]
> alert("in set model");
> var model = $('model'); //shortcut provided by prototype.js
> alert(model);
> var modelre = new RegExp(the_model);[/color]
There is no need for a regular expression if you are doing a simple
string equivalence test. If you are doing something else (e.g.
'thunderbird' is only part of the string you want to match) then maybe a
RegExp is required.
[color=blue]
> // Look through the models and match 'thunderbird'
> for (var i=model.options.length-1; i>=0; i--) {[/color]
That's a bit convoluted, try:
for (var i=0, len=model.options.length; i<len; ++i) {
[color=blue]
> var m = model.options[i].value;
> alert(m);[/color]
The 'var m...' line is not required.
[color=blue]
> if ( modelre.test(m) ) {[/color]
Using the RegExp and test will match the string 'thunderbird' anywhere
in the value of the option (say in the string 'I like thunderbird ...').
[color=blue]
> model.selectedIndex = i;
> }[/color]
if (model.options[i].value == the_model){
model.selectedIndex = i
}
[color=blue]
> }
> }[/color]
--
Rob
