Override CFSelect validation so that it "Just Works"
July 24 2008 by 
Adam
It's always bothered me that CFSelect validation only worked for multiple-select (list) boxes, and that we were left to our own devices to validate single-select (drop down) inputs. A few weeks ago I found a comment on Ben Forta's Blog that describes how to override the default validation function to properly handle single selects. The one caveat is that, since by nature a single-select input will always have one option selected, you have to have one invalid option. Generally I make it display, "Choose One:" or something like that. The value must be "" (not even a space).
To override the validation function, simply include this in your JavaScript somewhere. I put it in my global JS include so I never have to think about whether or not I'll need it on a given page.
var _CF_hasValue_old = _CF_hasValue;
_CF_hasValue=function(_b,_c,_d){
if (_b.type == 'select-one'){
var bSelected = false;
for (var i=0; i<_b.options.length; i++){
if ( _b.options[i].selected == true && _b.options[i].value != '' )
{ bSelected = true; break; }
}
return bSelected;
}else{
return _CF_hasValue_old(_b,_c,_d);
}
}
Use it like so:
Again, I can't take credit for coding this. I found it on Ben's blog, and thought it should make its way into the various aggregators.
Posted in ColdFusion | JavaScript | 
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