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| Author |
Message |
wkilc
Joined: 20 Mar 2005
Posts: 6
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 Posted: Tue Feb 19, 2008 6:14 pm javascript form validation |
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Hi all,
I'm using a JS form validation script from Dynamic Drive. A while back, the script's author customized it for me to allow for some very specific "dependency checking".
All I'm trying to do now is change one form element from a "pulldown" menu to a few radio buttons.
If field 1 (Vehicle) is answered "Toyota", then the second field (Model) becomes required (cannot be left blank). Works fine if "Model" is a text field or a pull-down... I cannot make it work with radio buttons or check boxes.
| Code: |
function formCheckToyota(formobj)
{
for (var i = 1; i <= 3; i++ )
{
if ( formobj.elements['Vehicle'+i].value == 'Toyota' )
{
if ( formobj.elements['Model'].value == '')
{
alert('Error: please select a vehicle model');
return false;
}
}
}
return true;
} |
This was one of my best attempts...
| Code: |
function formCheckToyota(formobj)
{
for (var i = 1; i <= 3; i++ )
{
if ( formobj.elements['Vehicle'+i].value == 'Toyota' )
{
if ( formobj.elements['Model'].[0]checked )
{
alert('Error: please select a vehicle model');
return false;
}
}
}
return true;
} |
...no dice. The base version of the script CAN check radio boxes, but I don't know enough to discern a solution. Here's the basic checking code from the script, if it helps:
| Code: |
for (var i = 0; i < fieldRequired.length; i++){
var obj = formobj.elements[fieldRequired[i]];
if (obj){
if (obj.type == null){
var blnchecked = false;
for (var j = 0; j < obj.length; j++){
if (obj[j].checked){
blnchecked = true;
}
}
if (!blnchecked){
alertMsg += " " + fieldDescription[i] + "\n";
}
continue;
}
switch(obj.type){
case "select-one":
if (obj.selectedIndex == -1 || obj.options[obj.selectedIndex].text == ""){
alertMsg += " " + fieldDescription[i] + "\n";
}
break;
case "select-multiple":
if (obj.selectedIndex == -1){
alertMsg += " " + fieldDescription[i] + "\n";
}
break;
case "text":
case "textarea":
if (obj.value == "" || obj.value == null){
alertMsg += " " + fieldDescription[i] + "\n";
}
break;
default: |
Thanks for reading,
~Wayne |
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kanenas
Joined: 14 Dec 2004
Posts: 191
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| Posted: Sun Mar 16, 2008 9:34 am Re: javascript form validation |
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| wkilc wrote: |
[...]
| Code: |
function formCheckToyota(formobj)
{
for (var i = 1; i <= 3; i++ )
{
if ( formobj.elements['Vehicle'+i].value == 'Toyota' )
{
if ( formobj.elements['Model'].[0]checked ) |
|
You've transposed the '.' and '[]' operators. It isn't clear to me from the sample, but you also probably need to loop over 'formobj.Model', looking for checked checkboxes beyond the first. |
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