Question

Determing which button clicked in a Dynamic array of buttons

Asked by: gmbeckett

I am creating an arrray of 100 or more Buttons dynamically

The idea is when the user clicks on a button it changes color.

I have done this with an array of ASP buttons by adding the Handler BtnColorClick

Code for creating buttons:

For Col= 0 To 100
     Btn(Col) = New Button
     Btn(Col).BackColor = Color.Red
     Btn( Col).CommandArgument = Col
     AddHandler Btn(Col).Command, AddressOf BtnColorClick
     Pnl.Controls.Add(Btn( Col))
    Next

Btn Click code:
   
Private Sub BtnColorClick(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.CommandEventArgs)

Dim Col as int16

Col = e.CommandArgument
If Btn( Col).BackColor.Equals(Color.Red) then
      btn(Col).BackColor = Color.Blue
Else
     btn(col).BackColor = Color.Red
End if

This works fine but the page is posted back so I have to re-create the buttons in the page load event

I can create a single HTML button called Bt and change the color in javascript.

function ChangeBtnColor() {
      if (Form1.Bt.style.backgroundColor == '#ff0000')
      {
      
            Form1.Bt.style.backgroundColor = "Blue";
      }
      else
      {
       Form1.Bt.style.backgroundColor = 'ff0000'
       }
      }

This works fine.

What I am trying to do is to create an array of HTML buttons dynamically and do the same thing in jarvascript without having to create up to 100 separate Btn click functions for each button.

My problem is is there a way of finding out which button is clicked in javascript so as that the correct button changes color as it does by using the ASP button method but without doing a page post back.


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Asked On
2006-09-21 at 04:04:56ID21997526
Tags

button

Topic

Programming for ASP.NET

Participating Experts
1
Points
500
Comments
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Answers

 

by: REA_ANDREWPosted on 2006-09-21 at 04:53:04ID: 17568222

the javascript way would be easy, I will write some javascript code to show you

 

by: REA_ANDREWPosted on 2006-09-21 at 05:01:44ID: 17568257

here you go save this as .htm file and see the effect, toggle buttons if you will

<html>

<head>
<title>New Page 1</title>
<script type="text/javascript">

window.onload = function()
{
      AddButtons();
      AssignClick();
}
function AddButtons()
{
      for(var i=0;i<100;i++)
      {
            var button = document.createElement("input");
            var LineBreak = document.createElement("br")
            button.setAttribute("type","button");
            button.setAttribute("name","button"+i);
            button.setAttribute("value","button"+i);
            if(i%10 == 0 && i != 0)
            {
                  document.body.appendChild(LineBreak);
            }
            document.body.appendChild(button);
      }
}
function AssignClick()
{
      for(var i = 0;i<document.getElementsByTagName("input").length;i++)
      {
            if(document.getElementsByTagName("input")[i].type =="button")
            {
                  document.getElementsByTagName("input")[i].onclick = function(what)
                  {
                        if(this.style.backgroundColor == "blue")
                        {
                              this.style.backgroundColor = ""
                        }
                        else{
                              this.style.backgroundColor = "blue"
                        }
                  }
            }
      }
}

</script>
</head>

<body>

</body>

</html>

 

by: REA_ANDREWPosted on 2006-09-21 at 05:02:45ID: 17568262

Assign Click is the function that you need. It will apply itself to all buttons on your page. You can further specify conditions so that it may only target some of your buttons./

 

by: gmbeckettPosted on 2006-09-21 at 07:20:28ID: 17569342

Excellent Answer and worked a treat.

I have incorporated it into my ASP.Net program and does what just what I wanted

 

by: REA_ANDREWPosted on 2006-09-21 at 07:22:16ID: 17569364

great stuff, glad I could be of help.

:-)

Andrew

20120131-EE-VQP-002

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