OnChange event handler question..

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  • xoinki
    New Member
    • Apr 2007
    • 110
    #1

    OnChange event handler question..

    hi all,
    I am trying to attach an event to onChange property..
    the function i am trying to attach is inside a class.
    for eg..
    my js has a structure as follows..
    Code:
    // if not defined
a = new Object()
//if not defined
a.b = new Object()
a.b.init = function()
{
  var vproto = a.b.Init.prototype;
   var vthis = this;
   vproto.somefunction = function()
   {
   }
   vproto.eventhandler = function()
   {
   }
}

// so eventhandler is the onChange event handler
    Now, my HTML looks somewhat like this..
    Code:
    <html>
...
..
<.... onchange = a.b.eventhandler;>
    here it is not throwing up any errors.. but the event handler is not called..
    please help me how to call this event handler inside the object?

    Waiting for u r reply,
    Xoinki
    Tags: None
    • gits
      Recognized Expert Moderator Expert
      • May 2007
      • 5390
      #2
      hi ...

      could you please explain what that code should do with that init() and Init.prototype? I assume you try to create a class but it seems little bit weird ... so explain the concept that you wish to use?

      kind regards

        Comment

        • xoinki
          New Member
          • Apr 2007
          • 110
          #3
          hi!
          Thnx for replying, I got the solution.
          What i am trying to do here is.. to disable/enable some elements based on select element change. I was trying to do the wrong way here.. I cannot call a eventhandler which is a member function of a class from HTML.. since i would require an instance of that class to access that handler.. the solution for this which i found out is to attach an event handler "onload" this solves the problem.

          Thnx and regards,
          Xoinki

            Comment

            • gits
              Recognized Expert Moderator Expert
              • May 2007
              • 5390
              #4
              glad to hear you got it working ... but i personally have a question about your class ... are you using any js-framework or how do you create your classes? i ask because a typical js-class is constructed as follows:

              [CODE=javascript]/**
              * constructor of class OBJ
              */
              function OBJ() {
              // a priv variable
              var foo = 'bar';

              // a public variable
              this.foobar = 'barfoo';

              // a privileged method to access the priv variable
              this._get_foo = function() {
              return foo;
              }
              }

              /**
              * extending the prototype
              */
              OBJ.prototype.a _method = function(params ) {
              // code of the method
              }

              // later on we may instantiate the obj
              var obj = new OBJ;

              // and call a_method
              obj.a_method();
              [/CODE]
              kind regards

                Comment

                • xoinki
                  New Member
                  • Apr 2007
                  • 110
                  #5
                  hi!,
                  I am not using any JS framework. actually I am using classes exactly as you have mentioned above. Only thing is i am using it in different way.

                  Code:
                  function OBJ() 
{
          // a priv variable
          var vFoo = 'bar';
          // a public variable
          this.vfFooBar = 'barfoo';
          // a privileged method to access the priv variable
           var vPrototype = OBJ.prototype;

        vProto.a_method = function(params) 
         {
          // code of the method
         }
 }
                  etc.. I Write all member functions inside the class itself. This gives me better readability since I need not search for member functions in a js file.. I know which are member function and which are not.

                  Thanx and regards,
                  Xoinki

                    Comment

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