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Validate select tag Items
1 Answer(s)      a year and 8 months ago
Posted in : JavaScript Questions


Hi, How to validate addition of two numbers of two different "select" tag items in JavaScript..?

Thanks in advance.


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December 7, 2012 at 3:37 PM


Here is an example that validates HTML select tag and find the addition of two numbers selected from the select tag.

<html>
        <script language = "Javascript">
         function validate(){
            if(document.form.n1.selectedIndex==""){
            alert ( "Please select first number!" );
            return false;  
           }
           if(document.form.n2.selectedIndex==""){
            alert ( "Please select second number!" );
            return false;  
           }
           var v1=document.form.n1.value;
           var v2=document.form.n2.value;
           var sum=parseInt(v1)+parseInt(v2);
           alert("Sum of two numbers: "+sum);
            return true;
          }
        </script>
        <form name="form" method="post" onSubmit="return validate()">
        <pre>
        Select Number1    <select name="n1">
                          <option value="Select">Select</option>
                          <option value="10">10</option>
                          <option value="20">20</option>
                          <option value="30">30</option>
                          <option value="40">40</option>
                          <option value="50">50</option>
                          </select>
        Select Number2    <select name="n2">
                          <option value="Select">Select</option>
                          <option value="60">60</option>
                          <option value="70">70</option>
                          <option value="80">80</option>
                          <option value="90">90</option>
                          <option value="100">100</option>
                          </select>

                          <input type="submit" name="Submit" value="Submit">
        </pre>
        </form>
</html>


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