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Thread: IF/ELSE statements and Form Validation

  1. #1
    Join Date
    Feb 2011
    Posts
    7

    IF/ELSE statements and Form Validation

    Hello,

    I am using the following javascript to validate a text field on my site:

    Code:
        function checkExpire(form)
      {
        // regular expression to match required date format
        re = /^\d{1,2}\/\d{1,2}\/\d{4}$/;
    
        if(form.txtExpire.value != '' && !form.txtExpire.value.match(re)) {
          alert("Invalid date format: " + form.txtExpire.value);
          form.txtExpire.focus();
          return false;
        } 
    	
        return true;
      }
    The above code works fine for the following situations:

    The default value of the field is: __/__/____

    The JavaScript code above will not accept that for a field value.

    If a user inputs the following for a date 5_/7_/11__
    for May 7th, 2011 the JavaScript will not accept the format it must be entered as:

    05/07/2011 (in order to clear the validation)...

    NOW HERE IS WHAT I NEED THE JAVASCRIPT TO DO:

    1) It needs to accept __/__/____ as a value that can be inserted into the database

    2) still retains the code above so 5_/7_/11__ is not an acceptable date but 05/07/2011 will work just fine

    3) Now... the default value of the text field in Internet Explorer is __/__/____ but the value is blank in Mozilla Firefox so in an instance where the text field is completely blank I need the JavaScript to assign the value '__/__/____' ...

    SO FAR:
    I did at one point get both the validation working so it worked for rules 1 and 2 mentioned above but I completely destroyed it while trying to integrate rule 3 into the functionality.

    So I know this can be accomplished with a series of if / else statements as well as assigning a value to a form object to handle rule# 3 ... I am just a novice getting ready to turn intermediate in JavaScript so any help, guidance, reference or example / sample code you could give me would be much appreciated.

    Thank your for your assitance and I hope you are all doing well.

    Cordially,
    aRK

  2. #2
    Join Date
    Sep 2008
    Location
    Jackson MS
    Posts
    585
    This might give you some ideas: once you break out the result into separate fields for month, day, and year checks for valid months, days in the month, 02/29/ only on leap years, and any valid ranges you have for dates can easily be added.
    Code:
    <html>
    <head>
    <title>Date-verify</title>
    <script language="JavaScript" type="text/javascript">
    
    function verify() {
    var mytext=document.myform.text3.value;
    var astring="";
    var result = mytext.match(/^(\d{1,2})\/(\d{1,2})\/(\d{4})$/)
    if (result == null) {
      alert("Format failed"); }
    else {
      for (var i = 0; i < result.length; i++) {
        astring += i + ": " + result[i] + "\n"; }
      alert(astring);
      }
    }  
    </script>
    </head>
    <body>
    
    <form name="myform">
    <INPUT id=text3 name=text3 value="00/00/0000" onChange="verify();">
    </form>
    </body>
    </html>
    HTH

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