Dynamically create checkbox based on the output in the responseText from server

[sarega]

Hi,
Here I have an array returned that is returned in responseText from the server. Based on the output that is returned by the server I have to dynamically create a checkbox.

function StateChanged() {
if(xmlHttp.readyState == 4) {
xyz=xmlHttp.responseText;
if(xyz!="false") {
alert("true");
Here I have to add a function to create a checkbox 
}
}
}
 

Somebody please help me??
I was trying to use document.createElement() but it did not work.
Thanks

[Dormilich]

you probably didn't append the created element to the document tree?

[sarega]

now am able to create a checkbox if a button is clicked. I wanted to check whether that particular checkbox if clicked another javascript function has to be evoked, am not able to figure out how to do that...

[Dormilich]

something like

document.getElementById(checkbox_id).addEventListener("click", callback_function, false);
// "change" instead of "click" should work too
// does not work in IE, workarounds available

[sarega]

Is there a possibility to add a text next to the dynamically created checkbox

[sarega]

And also onclick of the checkbox can we find is the checkbox been checked or unchecked

[Dormilich]

@sarega
yes
@sarega
yes

(for the sake of 20 chars)

[sarega]

Can we pass arguments to the callback function in the eventlistener

[Dormilich]

not directly, you have three options:

1. use a closure. the parameter must be known at closure creation time
   

   function parent_function(elem, param)
   {
       var temp = function() { callback_with_param(param); }
       elem.addEventListener("click", temp, false);
   }

2. use a property of the used element
   

   function callback()
   {
       var my_var = this.param;
       // do cool stuff here using my_var
   }
    
   function myFunc(elem, para);
   {
       elem.param = para;
       elem.addEventListener("click", callback, false);
   }

3. use an anonymous function. this event can not be removed!
   

   elem.addEventListener("click", function() { yourFunc(param); }, false);

[sarega]

I have dynamically added many checkboxes to the form and each of the checkboxes have different name,id and value. When the form is submitted how can I retrieve only those checkboxes which have been checked? The number of checkboxes in the form will vary everytime.
I will have something like this if i try to print all the posted values in the form
[red] => on [blue] => on
I want the red and blue, for my further processing

[Dormilich]

as far as I know, only the selected checkboxes will show up in the submitted data.

you can also filter off empty (i.e. all values that evaluate as false) values by

// PHP
$array = array_filter($_POST);

[sarega]

am trying to use both attachEvent and addEventListener but attchEvent is not working in IE

if(document.getElementById('chk').addEventListener) {
                document.getElementById('chk').addEventListener("click",function() { abc(colors); },false);
        } else if(document.getElementById('chk').attachEvent) {
                alert("here");
                document.getElementById('chk').attachEvent('onClick', function() { abc(colors); });
        } else {
                alert("Your browser does not support any handlers");
        }
 

Can somebody tell me what is the problem?

[Dormilich]

try (Javascript is case sensitive)

document.getElementById('chk').attachEvent('onclick', function() { abc(colors); });

otherwise you can use various cross browser functions ( e.g. addEvent() ) available via google

[sarega]

I have tried onclick also but even that did not work

[Dormilich]

maybe you should then use one of the addEvent() functions, they're working.

possibly attachEvent() doesn't like the anonymous function...?

[sarega]

attachEvent itself worked, thanks
does the

var div=document.getElementById("div_id");
var example=document.createElement('input');
example.type='submit';
example.name='submit';
example.value='submit;
div.appendChild(example);
 

not work in IE because its working in mozilla but not in IE.

[Dormilich]

I'm not sure if IE creates attributes via element.value = "value"; , you still could try the DOM methods setAttribute() or createAttribute() (at least they work for me)

[acoder]

You have an end quote missing on line 5. Always check the error console.

[sarega]

actually the end quote is not the problem, I removed the element.value=value but still its not working

[acoder]

Well, it would've been a problem if it was missing. When you say it's not working, what exactly do you mean? Does it not show up? Does it not submit the form when clicked?

[sarega]

It does not submit the form when clicked

[acoder]

Have you set the action of the form and is the div inside a form?

[sarega]

yes I have, its working for mozilla but not in IE

[acoder]

Post the HTML code or at least some test code demonstrating the problem.

[sarega]

var div=document.getElementById("div_id");
var example=document.createElement('input');
example.type='submit';
example.name='submit';
example.value='submit';
div.appendChild(example);
 

[sarega]

var test=document.getElementById('mydiv');
    var br=document.createElement('br');
    test.appendChild(br);
    var check=document.createElement('input');
 
    check.type='checkbox';
    check.id='check';
    check.name='Testmode';
     check.value='on';
 
    var text='Testmode';
    test.appendChild(check);
    test.appendChild(document.createTextNode(text));    
    var bre=document.createElement('br');
    test.appendChild(bre);
    var brea=document.createElement('br');
 
    test.appendChild(brea);
    var submit=document.createElement('input');
    submit.type='submit';
    submit.name='submit';
    submit.id='submit';
 
    submit.value='submit';
    test.appendChild(submit);
 

[acoder]

That's the JavaScript code. We already have that. What about the HTML code and where and how this JavaScript code is called? You could, of course, just post a link instead if possible.

[sarega]

Am calling this function as soon as the response is returned form the server.
But not able to figure out why its not working in IE.

[acoder]

You still haven't posted the HTML code.

[sarega]

<input id="chkbx" type="checkbox" value="on" name="example"/>
Change the color?
<br/>
<br/>
Colors
<br/>
<br/>
<input id="red" type="checkbox" name="colors[]" value="red"/>
red
<br/>
<input id="blue" type="checkbox" name="colors[]" value="blue"/>
blue
<br/>
<input id="green" type="checkbox" name="colors[]" value="green"/>
green
<br/>
</div>
<br/>
<input id="check" type="checkbox" name="Testmode" value="on"/>
Testmode
<br/>
<br/>
<input id="submit" type="submit" name="submit" value="submit"/>
<br/>
 

[sarega]

I have figured out that the problem is due to the usage of two different div's can you tell me how to use insertbefore to satisfy my requirement??
the usage of one div the problem is that
->first there is a text box based on the value entered in the textbox and clicked ajax is used to get the response,based on the response
->if the response is true then some more checkboxes is created and then another dummy checkbox and then submit is created dynamically
->if the response is false then dummy checkbox and submit is created
If i do not use 2 div's then the checkboxes created when the response is true is appended after the dummy and submit button but actually it has to be created before the dummy and submit button
How do I achieve this with insertbefore??

[acoder]

Before I answer that, can you answer this: if you already have a submit button, why do you create another identical one?

[sarega]

I do not have a submit button before am creating it dynamically later

[acoder]

Then what about the code you posted in #30?

[sarega]

I create that dynamically after the response is returned from the ajax

[acoder]

OK, when I asked for the HTML code earlier, I meant the HTML code before any changes.

I think we're going round in circles, so the best thing would be for you to post a link to your site, so that we can see all of the code.

[sarega]

Sorry that cannot be done because its confidential...
what do you want me to post?

[acoder]

Either PM me the link or attach the files here (removing sensitive/confidential info).