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Thread: form validation with javascript

  1. #1
    Join Date
    May 2013
    Posts
    1

    form validation with javascript

    Hi guys I am new to this forum and I really need someones help here with this, as I am trying to validate this form and really struggle with it. I only started here with first field validation and I tested it for a length of input although I need this to validate only numbers from 1-99999.
    I would be very grateful if someone can point me to the right direction. Here is my html code:

    <!DOCTYPE html PUBLIC
    "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
    <head>
    <meta http-equiv="Content-type" content="text/html; charset=iso-8859-1"/>
    <title>Submit runner time</title>

    <script type="text/javascript">
    /* <![CDATA[ */
    function validateRunnerID()
    {
    var RunnerID = document.getElementById("RunnerID").value;
    if (RunnerID.length == 0)
    {
    return "Error username is length zero\n";
    }
    else
    {
    alert("enter the number");
    return false;
    }
    }
    </script>


    </head>
    <body>
    <hr/>
    <h1>Submit runner time</h1>
    <hr/>
    Note: all fields marked '*' are mandatory.
    <p/>
    <form name="RunnerID" onsubmit="return validate(); method="post" action="http://test.php">

    <table>
    <tr><td>Runner ID*</td>
    <td><input type="text" name="RunnerID" id="RunnerID" size="5" maxlength="5"/></td>
    </tr>
    <tr><td>Event ID*</td>
    <td><input type="text" name="EventID" size="5" maxlength="5"/></td>
    </tr>
    <tr><td>Date (YYYY-MM-DD)*</td>
    <td><input type="text" name="Date" size="10" maxlength="10"/></td>
    </tr>
    <tr><td>Finish time (HH:MM:SS)*</td>
    <td><input type="text" name="FinishTime" size="8" maxlength="8"/></td>
    </tr>
    <tr><td>Position*</td>
    <td><input type="text" name="Position" size="5" maxlength="5"/></td>
    </tr>
    <tr><td>Category ID*</td>
    <td><input type="text" name="CategoryID" size="2" maxlength="2"/></td>
    </tr>
    <tr><td>Age grade*</td>
    <td><input type="text" name="AgeGrade" size="5" maxlength="5"/></td>
    </tr>
    <tr><td>Personal best</td>
    <td><input type="text" name="PB" size="1" maxlength="1"/></td>
    </tr>
    </table>
    <input type="submit" name="submitrunnertime" value="submit"/>
    <hr/>
    </form>
    </body>
    </html>

  2. #2
    Join Date
    May 2006
    Location
    Somewhere behind your screen
    Posts
    1,674
    the right direction in this case would be using a regular expression for checking this field value not only for symbols but for its length at once. if it passes this test - return true, otherwise - return false.

  3. #3
    Join Date
    Oct 2010
    Location
    UK
    Posts
    17
    This should do the trick.

    Code:
    <!DOCTYPE html>
    <html>
    <head>
    <meta http-equiv="Content-type" content="text/html; charset=iso-8859-1"/>
    <title>Submit runner time</title>
    
    <script type="text/javascript">
    function validateRunnerID()
    {
    	var RunnerID = document.getElementById("RunnerID").value;
    	RunnerID = parseInt(RunnerID);
    	
    	if (isNaN(RunnerID))
    	{
    		alert("Please enter a number.");
    	}
    	else if (RunnerID < 1 || RunnerID > 99999)
    	{
    		alert("Please enter a number between 1 and 99999.");
    	}
    	else 
    	{
    		alert("Success!");	
    	}
    }
    </script>
    
    
    </head>
    <body>
    <hr/>
    <h1>Submit runner time</h1>
    <hr/>
    Note: all fields marked '*' are mandatory.
    <p/>
    <form name="RunnerID" onsubmit="return validateRunnerID();" method="post" action="">
    
    <table>
    <tr><td>Runner ID*</td>
    <td><input type="text" name="RunnerID" id="RunnerID" size="5" maxlength="5"/></td>
    </tr>
    <tr><td>Event ID*</td>
    <td><input type="text" name="EventID" size="5" maxlength="5"/></td>
    </tr>
    <tr><td>Date (YYYY-MM-DD)*</td>
    <td><input type="text" name="Date" size="10" maxlength="10"/></td>
    </tr>
    <tr><td>Finish time (HH:MM:SS)*</td>
    <td><input type="text" name="FinishTime" size="8" maxlength="8"/></td>
    </tr>
    <tr><td>Position*</td>
    <td><input type="text" name="Position" size="5" maxlength="5"/></td>
    </tr>
    <tr><td>Category ID*</td>
    <td><input type="text" name="CategoryID" size="2" maxlength="2"/></td>
    </tr>
    <tr><td>Age grade*</td>
    <td><input type="text" name="AgeGrade" size="5" maxlength="5"/></td>
    </tr>
    <tr><td>Personal best</td>
    <td><input type="text" name="PB" size="1" maxlength="1"/></td>
    </tr>
    </table>
    <input type="submit" name="submitrunnertime" value="submit"/>
    <hr/>
    </form>
    </body>
    </html>

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