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  • Textbox Length Validation
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  • A textbox gives you an opportunity to allow people to submit a line of text as input in a form. There are a number of times when you want be certain that the input is not blank and fits within a specific minimum and maximum length range. The following example will only accept text input greater than three characters and less than ten characters. If the range is violated an alert box will display the number of characters entered and the valid length range. This script will also work on <textarear> </textarear> input field.
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    <html>
    <title>CodeAve.com(JavaScript: Validate Text Input Length)</title>
    <body bgcolor="#FFFFFF">
    <center>

    <script Language="JavaScript">
    <!-- 
    function Length_TextField_Validator()
    {
    // Check the length of the value of the element named text_name
    // from the form named form_name if it's < 3 and > 10 characters
    // display a message asking for different input
    if ((form_name.text_name.value.length < 3) || (form_name.text_name.value.length > 10))
    {
    // Build alert box message showing how many characters entered
    mesg = "You have entered " + form_name.text_name.value.length + " character(s)\n"
    mesg = mesg + "Valid entries are between 3 and 10 characters.\n"
    mesg = mesg + "Please verify your input and submit again."
    alert(mesg);
    // Place the cursor on the field for revision
    form_name.text_name.focus();
    // return false to stop further processing
    return (false);
    }
    // If text_name is not null continue processing
    return (true);
    }
    -->
    </script>


    <form name="form_name" method="get" action="http://www.codeave.com/html/get.asp" 
    onsubmit="return Length_TextField_Validator()">
    <input type="text" name="text_name">
    <input type="submit" value="Submit">
    </form>

    </center>
    </body>
    </html>

     

     

     



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