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  • Blank Text Field Validation
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  • Stop blank input before it reaches you form action destinations. Whether you have a <textarea> </textarea> or an input type=text you can easily stop blank input from leaving the current page. By checking the form input for a value in a simple tautology you can stop input and force input prior to submission. The following example will validate the text input field and display an alert box if no input is submitted.
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    <html>
    <title>CodeAve.com(JavaScript: Text Input Validation)</title>
    <body bgcolor="#FFFFFF">
    <center>

    <script Language="JavaScript">
    <!-- 
    function Blank_TextField_Validator()
    {
    // Check the value of the element named text_name
    // from the form named text_form
    if (text_form.text_name.value == "")
    {
    // If null display and alert box
    alert("Please fill in the text field.");
    // Place the cursor on the field for revision
    text_form.text_name.focus();
    // return false to stop further processing
    return (false);
    }
    // If text_name is not null continue processing
    return (true);
    }
    -->
    </script>


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

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

     

     

     



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