select boxes

[YCrowley]

does anyone know how i can disable a select box if on another select box the value = x

atm all i have is this

var countryselect=document.forms.country.value

if( countryselect ) = United Kingdom
     {
     document.forms.county.disabled=false;
     }
     else
     {
     document.forms.county.disable=true;
     }

[Flawless_koder]

OUCH!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

When you use = you are making an assignment - so the results of the assignment is always 1.
Remember that in all langauges ( scripting and programming ) at the end of the day the test must be binary.
* NOTE - not neccessarily true in the case of using fuzzy logic - but even then it is simplified eventually.

SO - when you put your logic of "assign this to that" it says " yep - i've done that: 1 " and so it will always run your first clause.

Secondly - the brackets evaluate the value of a variable and then (if the operator was right) would compare it without brackets - in this some languages this still works - but it is bad practice and frowned upon.

Thirdly - by not using inverted commas your comparisson will be treated as a variable ( or variable pair in this case ).

So:

if ( countryselect == 'United Kingdom') {
....

Would be the right way to do it...
However you are comparing the same field - so why bother with all this... in the onchange use:

this.disabled=(this.value=='United Kingdom')?true:false

or something like it.

Hope this all helps

Flawless

[YCrowley]

woo, that does help ta

only prob i got is that if i change the value to a non United Kingdom one, it disables it, but if i change it back to the UK the other select box is still disabled :/

ta for the help btw, much appreciated

*edit* also, it's meant to disable the other select box when it's not on UK, so i changed it to
disabled=(self.value!=='United Kingdom')?true:false

[MarcusJT]

One too many equals:
"!==" --> "!="




M@rco