So I have a UserControl with some cascading DropDownLists on it. Selecting from list 1 enables list 2, which in turn enables list 3. Once you've made a selection in all three lists, you can move to the next page.
The DropDownLists are all inside an UpdatePanel. But the "Next Page" button is outside the UpdatePanel. That button should be disabled until all three lists have a selection, and then it should be enabled again. But since the button is outside the UpdatePanel, it doesn't update when I make selections. (Edit: The "Next Page" button is on a page that also contains the UserControl.)
I know one way to resolve this:
var scriptManager = ScriptManager.GetCurrent(this.Page);
scriptManager.RegisterPostBackControl(dropDownList1);
scriptManager.RegisterPostBackControl(dropDownList2);
scriptManager.RegisterPostBackControl(dropDownList3);
This ensures a postback when any dropdown list is changed, so that the button can update. But if I do this, I might as simplify by getting rid of the UpdatePanel in the first place.
Is there another way, through some clever JavaScript or something, that I can update a control outside an UpdatePanel without having to give up Ajax?
Place an UpdatePanel around the next button and create a trigger for each of the dropdowns so that it fires an async postback. Ex:
<Triggers>
<asp:AsyncPostBackTrigger ControlID="dropDownList1" />
<asp:AsyncPostBackTrigger ControlID="dropDownList2" />
<asp:AsyncPostBackTrigger ControlID="dropDownList3" />
</Triggers>
Could you not add a update panel around the "next page" and then add a trigger to the dropdownlist updatepanel for triggering the next page update panel?
Just throwing out ideas, without actually having tried it :)
you can upddate a control outside the update panel by placing it into update_panel2 and saying update_panel2.update().
Note the UpdateMode of the UpdatePanel must be set to conditionalfor this to work.
This would ideally be done in javascript, with a server-side validation check in the click event handler.
A quick jQuery example:
//assuming the dropdowns all have the css class "cascade"
$('select.cascade').change(function() {
If ($('option:selected',this).length == 3) {
$('input[id$=btnNext]').removeAttr('disabled');
}
});
Related
I am developing a website using asp.net/C#
I want to create a button that can save user data then move to a div tag at the same page.
I already did the saving part, but how do I make the same button to navigate to a different div tag within the same page?
some people use the response.redirect method to navigate to a different page. I want to navigate to a div tag within the same page. For example:
Experience
after I press that it will take me to:
<div class="panel" id="experience">
I want to do the same but with button that can do both that and saving to a DB. As I said, I already did the saving part.
I tried this:
<asp:Button ID="Button1" runat="server" Text="Save & Continue" OnClientClick="#experience" OnClick="Button1_Click" />
But it didn't work.
any ideas? I am trying to access that div tag from code behind
If this is WebForms and you don't want to use javascript, then, after you do the save, you can do a Response.Redirect to the same url, but with the anchor tag, e.g. Response.Redirect("myPage.aspx#experience").
This really depends on the rest of your code though. I suggest posting the relevant parts of your code behind so that we can better see what you have done. Also, don't try to avoid javascript - it is too useful to avoid.
ASP.NET has a Focus method that can be applied to the following ASP.NET server controls:
Button
LinkButton
ImageButton
CheckBox
DropDownList
FileUpload
HyperLink
ListBox
RadioButton
TextBox
At the end of your Button1_Click event handler code-behind, add something along this lines of this:
TextBoxExperience.Focus();
Note - The TextBox control with ID of TextBoxExperience control would be inside of the experience DIV.
I've just implemented a small UpdatePanel with a button outside the panel that modifies the controls within it. Per instructions here and here I have set up a trigger on Page_Load that looks like this...
UpdatePanel1.Triggers.Add(item: new AsyncPostBackTrigger
{
ControlID = Button1.UniqueID
});
...in order to allow the button click event to update the panel asynchronously (it was refreshing the whole page before). However, now it works asynch the first time, but every other click after that triggers a whole page refresh. I'm pretty confused by that one. Can anyone spot what's wrong? (Edit: To clarify, the following represents the refresh results of a series of clicks starting after page load: Asynch (good), Whole Page (bad), Asynch, Whole Page, Asynch, Whole Page, etc...)
FYI the form is ASP.NET 4.0 and resides in a SharePoint 2013 visual web part, if that matters.
try scriptmanager EnablePartialRendering property like this
<asp:ScriptManager ID="ScriptManager1" runat="server" EnableViewState="False" EnablePartialRendering="true"> </asp:ScriptManager>
Im using asp.net c# (webforms)
I want to add a back button to my page. (you land on this page if you incorrectly fill in a form).
if javascript is enabled i want to go back via javascript, but if it is disabled i'll just do a response.redirect("~/home.aspx")...
how can i implement this? is it 2 buttons? how can i hide the other in the 2 different states if so.
thanks
<asp:Button OnClick="serverMethod" OnClientClick="return(jsMethod);" runat="server" ID="redirectButton" Text="Back" />
on the button, but set the OnClientCLick to:
return(javascriptredirect());
and the OnClick to your button click event handler in your code behind.
if javascript is enabled, it will do the javascript redirect, if not enabled the page will post back and you can do your OnClick code behind method whic can to the response.redirect. You can also return false from your function to prevent the postback from occurring such as the case with setting the OnClientClick="return(confirm('Are you sure?'));"
This link guides you how to do it http://aspadvice.com/blogs/azamsharp/archive/2007/09/30/Check-If-the-JavaScript-is-Enabled-on-the-Client_2700_s-Browser.aspx
Happy coding !!!!!!
I have a gridview inside a ModalPopUpExtender, the grid view have the button add delete and edit when i clic one of the button of the gridview the popup is closed. I wont to close the popup when the close button is clicked.
This is the asp.net part:
< cc1: ModalPopupExtender ID="NamePopup" runat="server" PopupControlID="OptionPanel" TargetControlID="btnD" BackgroundCssClass="mpBg" DropShadow="true" OkControlID="btnSavePopup" CancelControlID="btnPostCancel" >
< / cc1:ModalPopupExtender>
Any ideas??
The click is triggering a Page Load, even though you're using the Ajax Controls.
Look at the last post here for one person's solution. Use google if that won't work for you.
You can get your popup panel to persist by calling ModalPopupExtender.Show() method from inside the server-side methods that handle postbacks from controls inside your popup panel.
I am creating a button dynamically in my code and attaching a click event to it. However I have to prevent people to click it while there is a process going on. So when it is clicked once, it should be disabled and when the process ends it should be enabled. How can I do that?
Thanks.
onclick="this.enabled=false" add this from your code behind to your control
btnAdd.Attributes.Add("onclick", "this.enabled=false;");
This link explains in detail http://encosia.com/2007/04/17/disable-a-button-control-during-postback/
If you are processing via ajax when the button is clicked-
1. Disable the button when processing starts
2. Enable the button after processing completes
If the button postbacks, the best way is to disable the button when it is clicked via javascript [I won't suggest jquery just for this particular task]. Since after postback the button will be enabled as it was earlier, you don't need to worry about enabling.
<asp:Button ID="btn" runat="server" OnClientClick="disable(this)"
Text="Click me!" OnClick="btn_Click" />
<script type="text/javascript">
function disable(control)
{
control.disabled="disabled";
//added alert to give the snapshot of what happens
//when the button is clicked
alert(100);
}
</script>
Hope this helps.
I would use an UpdatePanel arround the button. On click you can serverside disable the button. Use a trigger on the updatepanel that looks every x seconds if your extern process has returned a result. And I would advise you to source out long running processes into a windows service.