Hi, I am new to AJAX and trying to figure out the following:
I am trying to display a popupwindow within an AJAX UpdatePanel, but when I used the following code with ajax no popup window appears. When I take it out of the update panel it works fine.
Any help would be much appreciated! Thanks.
PublicSub DisplayMessage(ByVal objPageAs System.Web.UI.Page,ByVal messageAsString) 'Replace end of line characters with JavaScript \n newline character. message = Replace(message, vbCrLf,"\n") message = Replace(message, vbCr,"\n") message = Replace(message, vbLf,"\n") message = Replace(message,"""","\""") 'Replace ugly database tags with (slightly) more meaningful text. message = Replace(message,"[DataDirect ADO Sybase Provider]","Sybase Error:") message = Replace(message,"Native Warning code","Error #:") Dim pageTypeAs Type = objPage.GetType() Dim displayNameAsString ="displayMessage" Dim csAs System.Web.UI.ClientScriptManager = objPage.ClientScript If (Not cs.IsStartupScriptRegistered(pageType, displayName))Then Dim displayTextAsString ="alert(""" & message &""");" cs.RegisterStartupScript(pageType, displayName, displayText,True) EndIf EndSub
#########################################################################
The above code is getting called from the below code.
IfNot IsDate(txtStartDate.Text)Then
DisplayMessage(Page,"Please enter a valid start date.")
ReturnFalse
EndIf
unfortunently, when firing server side functions from inside an updatepanel, it cannot make changes to the page, only to objects on the page that are inside the updatepanel. With this said, trying to write a startup script or any type of javascript block from a updatepanel partial postback will not work, probably for the same reason you cannot use the response.write method. You will either need to deal with the full page postback or handle the popup window in the javascript events.
-ALan
Hi,
to inject JavaScript during a partial postback, you should use the RegisterXXX methods of the ScriptManager control.
Hi Garbin,
Even I' looking for a similar kind issue. and I tried your suggestion, but not getting it properly. I'm getting an exception like
The Script tag registered for tpe 'ASP.sections_events_myPage_aspx' and key 'Key' has invalid characters outside of the script tags: alert();. Only properly formated script tags can be registered.
In the code behind I'm calling the function as
ScriptManager.RegisterClientScriptBlock(Me.Page, Me.GetType(), "key", "alert();", False)
I think my parameters are not right. Can you give an example of this function or explain its parameters. I saw the doc on msdn but did't understand it perfectly.
Thanks,
Mehul Mistry
Hi,
Can you please check the following...
Dim script As String = "function test()" & _
" { " & _
" alert('test');" & _
" } "
ScriptManager.RegisterClientScriptBlock(Me, GetType(Page), "TestFunction", script, True)
I did the above stuff in the method which is called on asyncronous callback in AJAX. It gets executed but there is no alert() msg displayed...
Is this the correct way to do it?
Thanks,
Mehul Mistry
Hiorlash,
I think I figured out the solution.Its working for me. For your situation, What you can do is make a small js file or if you have one then add your window opening javasript function inside the js file. ( Make your javascript function take one string parameter to display your msg from code behind, Like you are doing above ).
Now in you aspx page, you must be having ScriptManager. add one element to the script manager... as follows,
<asp:ScriptManager ID="ScriptManager1" runat="server" >
<Scripts>
<asp:ScriptReference Path="MyJavascriptFile.js" />
</Scripts>
</asp:ScriptManager>
and in the code behind, whichever method is called by the asyncronous call of AJAX, call your function as...
ScriptManager.RegisterClientScriptBlock(Me, GetType(Page), "OpenWindow", "fnOpenWindow('myMsg');", True)
This should do the job. Its working for me.
Any better ideas and comment are always welcome :-)
Hiorlash,
Above thing works great... Alternately if you don't want to create a js file then then add your javascript function in your aspx page only in the head section as
<script type="text/javascript">
function fnOpenWindow(myMsg) {
window.open("MyPage.aspx?msg="myMsg,"","scrollbars=yes,statusbar=no,directories=0,status=0,menubar=0,width=605,height=335,left=205,top=205");
// or you can use alert
// alert(myMsg);
}
</script>
and in the DisplayMessage function after you build your message string call the function as
ScriptManager.RegisterClientScriptBlock(Me, GetType(Page), "OpenWindow", "fnOpenWindow(' " & message & " ');", True)
This will also work.
Thanks Mehul,
That works great for me now.
Thanks again,
Orla
Hi, sory to pick up the conversation, but i've got the same problem.
Putting the Javascript on an .JS at the head of the control worked for me. The thing is that i'm using a composite control and i had the javascript inside it. By taking the code and creating an .Js i'm creating dependencies for it.
Is there any way to create the .js, but keeping it inside the composite control?
Thank you.
rangers99: