[thelist] [JS] Truly checking for empty fields
Tom Dell'Aringa
pixelmech at yahoo.com
Fri Apr 9 09:49:33 CDT 2004
Along the same lines - I've always wondered about this one. When you
require a field to not be empty, often you see validations do the
following:
if(myField.value == ""){
return false
}
This is fine for a tab or if the field is truly empty, but if I
simply enter a space I can bypass this validation. If you aren't then
validating the *type* of data afterwards, this can sneak through your
validation.
We have this function available which seems to work:
function requiredField(field) {
var nonblanks = 0;
var thisChar;
for (i = 0; i < field.value.length; i++) {
thisChar = field.value.charCodeAt(i);
// 32 is a blank; 9 is a tab
if (thisChar != 32 && thisChar != 9)
nonblanks += 1;
}
if (nonblanks == 0) {
return false;
}
return true;
}
I'm not sure how reliable checking for the characer numbers 32 and 9
is. (Note: No need to support anything prior to NS6 or IE5). But it
seems to work. And again, I'm wondering if a regex is not a better
solution here.
Comments?
Tom
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