Question

ASP.NET ImageButton OnMouseOver from code behind page

Asked by: conrad2010

I have an ASP.NET ImageButton control and it has 3 states ( a,b and c) and is used as a tab button... the tab button can be unselected (a), moused over (b) and selected (c)...

State a: normal image
State b: mouse over image
State c: image clicked

THe problem is that wwhen the image is clicked, the OnMouseOut needs to show a different image then when the image is in the normal state...

How can this be done from code behind?

VS2008, VB or CS, ASP.NET 3.5

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Asked On
2009-09-15 at 12:26:57ID24734137
Topics

Miscellaneous Programming

,

Programming for ASP.NET

,

C# Programming Language

Participating Experts
2
Points
500
Comments
3

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Answers

 

by: HainKurtPosted on 2009-09-15 at 13:32:45ID: 25339105

here is a working sample...

<script>
var selTab = "<%= selTab %>";
function howerTab(img, n){
  if (n != selTab) {
	img.src="img/1.gif";
  }
}
 
function clearTab(img, n){
  if (n != selTab) {
	img.src="img/0.gif";
  }
}
</script>
 
	<asp:ImageButton id="img1" runat="server" ImageUrl="img/0.gif" onmouseover="howerTab(this,1)" onmouseout="clearTab(this,1)" CommandArgument ="1" OnClick="tabSelected" />
	<asp:ImageButton id="img2" runat="server" ImageUrl="img/0.gif" onmouseover="howerTab(this,2)" onmouseout="clearTab(this,2)" CommandArgument ="2" OnClick="tabSelected" />
	<asp:ImageButton id="img3" runat="server" ImageUrl="img/0.gif" onmouseover="howerTab(this,3)" onmouseout="clearTab(this,3)" CommandArgument ="3" OnClick="tabSelected" />
	<asp:ImageButton id="img4" runat="server" ImageUrl="img/0.gif" onmouseover="howerTab(this,4)" onmouseout="clearTab(this,4)" CommandArgument ="4" OnClick="tabSelected" />
	<asp:ImageButton id="img5" runat="server" ImageUrl="img/0.gif" onmouseover="howerTab(this,5)" onmouseout="clearTab(this,5)" CommandArgument ="5" OnClick="tabSelected" />
 
------------------------------------------------------------------------------
	Friend seltab As Integer = 0
 
	Protected Sub tabSelected(ByVal sender As Object, ByVal e As System.Web.UI.ImageClickEventArgs)
		img1.ImageUrl = "img/0.gif"
		img2.ImageUrl = "img/0.gif"
		img3.ImageUrl = "img/0.gif"
		img4.ImageUrl = "img/0.gif"
		img5.ImageUrl = "img/0.gif"
 
		seltab = sender.CommandArgument
		Dim img As ImageButton = Page.FindControl("img" & seltab)
 
		img.ImageUrl = "img/2.gif"
	End Sub
                                              
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by: HainKurtPosted on 2009-09-15 at 13:34:43ID: 25339138

oops, looks like the above solution is not exactly what you need...
but you have everything in above solution to create yours :)

 

by: azarc3Posted on 2009-09-15 at 14:12:42ID: 25339591

The best you're going to be able to do is one of the following:
1. Use AJAX to update the button dynamically (kind of overkill)

2. Use JavaScript, totally on the client side (easiest, but lacks some run-time flexibility)

3. Use a combination of codebehind and jQuery to achieve the desired effect (I have no experience here)

4. Use a mix of codebehind and JavaScript to essentially use JavaScript-only at run-time but allow you to determine what you want to do programmatically at run-time (maybe at 'render-time' is the best way of putting it)

I suggest you use #4, where you'll code what is essentially 'normal' JavaScript, but it is not actually 'written' until the page is rendered and where/when you intended. So, for example, you can still use a database record to determine what you want those 3 images should be.

Incidently, you can also do this for more extensive use... so for instance, if I needed to add a function for buttons in a GridView to be able to show a JavaScript dialog to confirm a Delete operation request then this is how I'd do it. At the point in the Page Lifecycle where the button needs to be rendered for the first time, using the ClientScript.RegisterClientScriptBlock() method. You can see more about this technique here: http://msdn.microsoft.com/en-us/library/system.web.ui.clientscriptmanager.registerclientscriptblock.aspx

But to answer your question directly...

//Version for the MouseOver
YourControlID.Attributes.Add("OnMouseOver", String.Format("{0}.src='{1}'", ResolveUrl(YourControlID.ClientID, ThePathToTheImageToShow)))
 
//Version for the MouseOut
YourControlID.Attributes.Add("OnMouseOut", String.Format("{0}.src='{1}'", ResolveUrl(YourControlID.ClientID, ThePathToTheImageToShow)))

                                              
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