Question

How to get parent object from child object?

Asked by: maheshexp

I've two problems.
Retreiving parent objects.

1. Inside a form I've a button. Now on the click of button , I invoke a method. Now how to get the form object reference inside the button or method, which button invokes.

2.
<button onclick"x()" >SOme Button</button>

function x()
{
   /* code which gets the button object reference */
}

Now inside the function x(), I need the "button" object reference. How do I get it?.

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Asked On
2007-09-28 at 05:31:37ID22859170
Tags

parent

,

get

,

object

Topics

JavaScript

,

Miscellaneous Web Development

Participating Experts
5
Points
250
Comments
9

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Answers

 

by: hernst42Posted on 2007-09-28 at 05:39:08ID: 19978132

use "this" to give the button object to the function like
function x(button) { ... }

<button onclick="x(this)">...

The in x you can access the button via the variable button

 

by: knightEknightPosted on 2007-09-28 at 05:39:17ID: 19978133

use this.form

<button onclick"x(this.form)" >

 

by: maheshexpPosted on 2007-09-28 at 06:30:28ID: 19978488

No my fuction x() doesn't take any arguments. That's the problem here...

 

by: dakydPosted on 2007-09-28 at 10:55:41ID: 19980478

Is there something preventing you from changing the x() function?  Passing the argument is the simplest solution to your question, so if you can go that route, you should.

 

by: maheshexpPosted on 2007-09-28 at 20:47:58ID: 19982908

yeah, the function x() signature is automatically generated. I can only have logic for that using the given arguments. Other than that, I can't change the signature.

 

by: hernst42Posted on 2007-09-28 at 23:53:13ID: 19983189

can you add an id to the form name or do you have multiple forms on the page? If you can't change the signature and can't use ids it's AFAIK not possible to get the caller-object of the function.

 

by: LeeKowalkowskiPosted on 2007-09-29 at 23:45:06ID: 19986396

It doesn't matter whether your function signature has any arguments, you can always pass a function arguments and then inspect the arguments array.

  function x()
  {
    var button = x.arguments[0];
  }

  ...
  <button onclick="x(this)">

--
Lee

 

by: Computer101Posted on 2007-12-07 at 18:00:14ID: 20432416

Forced accept.

Computer101
EE Admin

20120131-EE-VQP-002

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