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01.16.2008 at 10:55AM PST, ID: 23087984
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7.6

having trouble setting form variable from javascript function

Asked by jmarkfoley in JavaScript

I have the javascript function chxDirty() as shown in the snippet. When the user changed e.g. field named _55_desc, it calls the chxDirty() function and I want that function to set the field _55_change to a value.

In the function, it constructs the name "_55_change" properly (as verified by the alert) and appears to locate that field using getElementsByName(). The final alert does, in fact, show "_55_change: true".

However, when the form is submitted, the parameter _55_change is empty! Not set to "true". What am I doing wrong?
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function chxDirty(fld)
{
    changeField = fld.name.substr(0,fld.name.indexOf("_",1) + 1) + "change";
    alert(changeField);
    var chgFld = document.getElementsByName(changeField);
    chgFld.value="true";
    alert(changeField + ": " + chgFld.value);
}
 
:
 
<input type=hidden name=_55_change size=10 value="">
<input type=text onChange="chxDirty(this);" name=_55_desc size=60 maxlength=100 value="Reproducir 1">
[+][-]01.16.2008 at 11:19AM PST, ID: 20675058

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[+][-]01.16.2008 at 11:23AM PST, ID: 20675102

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About this solution

Zone: JavaScript
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Solution Provided By: araim
Participating Experts: 3
Solution Grade: A
 
 
[+][-]02.26.2008 at 03:45AM PST, ID: 20983358

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[+][-]03.16.2008 at 02:42AM PDT, ID: 21136299

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