RegisterClientScriptBlock Method

[thiruvasagamani]

RegisterClientScriptBlock Method

Now let's create a better version of the button rollover example by using the RegisterClientScriptBlock method. The problem with the rollover button example from earlier is that when the end user's mouse hovered over the button image, the rollover image had to be retrieved from the server in a separate request. A better rollover button situation would be where the rollover image of the button is already downloaded and stored in the browser's cache so that when the end user hovers over the button, it is instantaneously displayed. To accomplish this we must build a JavaScript function. The following example shows the JavaScript function as well as the use of the RegisterClientScriptBlock method to get the function onto the page. For this example, the code-behind only needs a Page_Load event and a button-click event for an ImageButton server control.

Visual Basic .NET

Code Select Expand

Private Sub Page_Load(ByVal sender As System.Object, _
   ByVal e As System.EventArgs) Handles MyBase.Load
        Page.RegisterClientScriptBlock("MyScript", _
            "<script language=javascript>" & _
            "if (document.images) {" & _
            "MyButton = new Image;" & _
            "MyButtonShaded = new Image;" & _
            "MyButton.src = 'button1.jpg';" & _
            "MyButtonShaded.src = 'button2.jpg';" & _
            "}" & _
            "else {" & _
            "MyButton = '';" & _
            "MyButtonShaded = '';" & _
            "}" & _
            "</script>")

        ImageButton1.Attributes.Add("onmouseover", _
           "this.src = MyButtonShaded.src;" & _
           "window.status='Oh Yes! Click here!';")
        ImageButton1.Attributes.Add("onmouseout", _
           "this.src = MyButton.src;" & _
           "window.status='';")
End Sub

Private Sub ImageButton1_Click(ByVal sender As System.Object, _
  ByVal e As System.Web.UI.ImageClickEventArgs) Handles ImageButton1.Click
        Label1.Text = "Postback!"

Source : MSDN

[Rohithgopi]

Can u make it more clear   

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