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Thread: Validate Form Class

  1. #1
    Join Date
    Nov 2007
    Posts
    4

    Validate Form Class

    Hello, I'm trying to develop a series of classes to validate my webforms, I'll try to explain the idea:

    I what to create a HTML form whiteout any javascript event, for example:

    <form id="form1" name="form1" method="post" action="">
    <input type="button" name="button" id="button" value="Button" />
    </form>


    I call the class in the head section (or in external javascript file)

    For example:

    var alert=new alert_button('button');

    The class alert_button would have a method called onclick

    For example:

    alert_button.onclick=function(){
    alert('HELLO');
    }


    What I would what to do is when I call var alert=new alert_button('button'); all the methods and properties from alert_button class woud be passed to the object of the element form whit the ID informed (in this case the id button that is from a input element)! This would be very useful because if I what to add a new methods to that elements I would only have to add the method to the class!

    The problem is that I cant do that passing of methods, I think that the problem is because the object is already instantiated after I try to pass the new methods! (Note that the object type in this case is a input type button, but it could be any type, for example it could be a anchor link).

    Here is a example of my code:

    Code:
    <head>
    <title>Class Test</title>
    <script type="text/javascript">
    
    	
    	function elemento(id){
    		this.id=id;
    	}
    	
    	elemento.prototype.onclick=function()
    	{
    		return 0;
    	}
    	
    	
    	
    	function botao(id,men){
    		
    		elemento.call(this,id);
    
    		var targ=document.getElementById(id);
    		
    		this.men=men;
    		
    		targ.call(targ,this);
    	}
    	
    	botao.prototype=new elemento();
    	botao.prototype.onclick=function()
    	{
    		alert(this.men);
    	}
    	
    	
    	
    	function loade()
    	{
    		var teste=new botao('button',"HELLO");
    		var teste=new botao('button2',"HELLO TOO");
    	}
    
    </script>
    </head>
    
    <body onload="loade()">
    <form id="form1" name="form1" method="post" action="">
      <input type="button" name="button" id="button" value="Button" />
      <input type="button" name="button" id="button2" value="Button" />
    </form>
    
    </body>
    </html>
    Can any one help me make this work?

    Thanks for the help!
    Last edited by soloam; 11-27-2007 at 11:17 AM.

  2. #2
    Join Date
    May 2007
    Location
    Cleveland, OH
    Posts
    1,403
    You look to me like a C-style programmer. If you want to jump right into the meat of OOP in javascript try giving this article a read. It's hard for me to tell what exactly what your trying to do from your example, looks like you just want to extend classes, but it's hard to read/follow.

  3. #3
    Join Date
    Nov 2007
    Posts
    4
    Yes the idea is to extend the element object to gain the attributes and methods of the class being called, in this case "alert_button"! That is the idea! But extending the class seams to me like a unlike way, the element object (in this case the input button) is already created when I create the new class that would have the job to add the new methods and properties to the object! No?

  4. #4
    Join Date
    May 2007
    Location
    Cleveland, OH
    Posts
    1,403
    I kinda get the just of it. Elements in the DOM already have their own set of predefined attributes and functions, prototyping them is quite difficult due to browser inconsistencies (*cough* IE *cough*). I know the javascript libraries mootools and prototype.js provides pretty extensive support for what your trying to do, it'll probably be much easier then doing it yourself.

  5. #5
    Join Date
    Nov 2007
    Posts
    4
    TJ111 mootools libraries is great.. :|

    Tks for the tip!!!

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