[UNDEFINED ERROR] Please help :)

**buttlerkid** · 07-04-2009, 10:22 AM

Hello there, this is my first post here, and I've just started javascript. My problem is that I get an undefined error on this page after i write the result and click on the "Click Here to vote" button.

Here's the page : http://85.204.99.55/top5/index.php?a=in&u=crimes

(Hope this won't be considered advertising)

My script source is :

Code:

            
    <script type="text/javascript">
    var a = Math.ceil(Math.random() * 20);
    var b = Math.ceil(Math.random() * 20);       
    var c = a + b
    function DrawBotBoot()
    {
        document.write("What is "+ a + " + " + b +"? ");
        document.write("<input id='BotBootInput' type='text' maxlength='2' size='2'/>");

    }    
    function ValidBotBoot(){
        var d = document.getElementById('BotBootInput').value;
		
        if (d == c){   
		        window.location = "{$list_url}/index.php?a=in&amp;u={$username}&amp;sid={$sid}";
				
     }
	 else
        return false;
		
        
    }
    </script>

    
    
    
</head>
<body>

Are you human?<br />

<script type="text/javascript">DrawBotBoot()</script>
<input id="Button1" type="button" value="Click Here to Vote" onclick="alert(ValidBotBoot());"/>

The original code :

Code:

    <script type="text/javascript">
    var a = Math.ceil(Math.random() * 10);
    var b = Math.ceil(Math.random() * 10);       
    var c = a + b
    function DrawBotBoot()
    {
        document.write("What is "+ a + " + " + b +"? ");
        document.write("<input id='BotBootInput' type='text' maxlength='2' size='2'/>");
    }    
    function ValidBotBoot(){
        var d = document.getElementById('BotBootInput').value;
        if (d == c) return true;        
        return false;
        
    }
    </script>

    
    
    
</head>
<body>

Are you human?<br />

<script type="text/javascript">DrawBotBoot()</script>
<input id="Button1" type="button" value="Check" onclick="alert(ValidBotBoot());"/>

What am i missing? What did i do wrong?

Thank you in advance and have a nice day !

**Malgrim** · 07-04-2009, 10:59 AM

You don't have an undefined error, you're simply opening a message box with an undefined argument:

Code:

onclick="alert(ValidBotBoot());"

If the user gives the right answer, ValidBotBoot() doesn't return anything, therefore the output is undefined. Return true in that case and/or add an if clause

Code:

onclick="if(ValidBotBoot()===false){alert('incorrect')};"

if you don't want any popup on a correct input.

**buttlerkid** · 07-05-2009, 03:38 AM

Appreciate your help. Thank you very much !

**patrick.kershne** · 04-14-2012, 08:42 PM

Here is what i have modified, and its not working

HTML Code:

<script type="text/javascript">
    var a = Math.ceil(Math.random() * 20);
    var b = Math.ceil(Math.random() * 20);       
    var c = a + b
    function DrawBotBoot()
    {
        document.write("What is "+ a + " + " + b +"? ");
        document.write("<input id='BotBootInput' type='text' maxlength='2' size='2'/>");
    }    
    function ValidBotBoot(){
        var d = document.getElementById('BotBootInput').value;
        if (d == c) return true; 
        (alert("Wrong Code"));
        document.getElementById('tryagain').value();
        return 'Wrong Answer';    }
    </script>

I am trying to Target a span ID, <span id="tryagain"></span>

But I cannot get it to target, Any ideas?

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