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SSN length validator

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benniesanders

Programmer
Jan 20, 2002
199
US
Greetings, I'm not very javascripty, but I have this required field (last four digits of SSN) in a form on an active server page. I am using the following code to validate the required fields but I noticed some registrants must hit the space bar to move on and I need to validate that four digits are actually entered into this field. Is there any way I can enhance or work with this particular block of code to ensure they enter four digits:
Code:
    if (form.txtSSN.value == "") {
    alert( "Please enter the last four digits of your Social Security Number." );
    form.txtSSN.focus();
    return false ;
  }
Many thanks in advance!
 
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