How can update a input hidden inside an UpdatePanel on an AsyncPostBack?
The user click a button outside the panel. The method associated with click event update the value of the input (it has runat="server" property).
I can't update the value of this input.
I need to store a value to use in the following postback. Maybe I can use session to store this value.
Any advice?
Thank you!
Because its a postback, you might have to perform a check in the post back event and perform the update. If not, you might have to override an earlier event. See http://msdn.microsoft.com/en-us/library/dct97kc3.aspx
If you are needing to have the update panel (and its contents) updated based on the user clicking on a button which is not in the update panel, add a section to the update panel like the following:
<asp:Button ID="btnOK" runat="server"/>
<asp:UpdatePanel ID="pnlMyPanel" runat="server">
<ContentTemplate>
<!-- Content to get updated -->
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnOK" />
</Triggers>
</asp:UpdatePanel>
The triggers section in the above example tells the update panel to update if the button is clicked.
You might want to try an <asp:HiddenField> rather than an <input type='hidden' runat='server'>. I think the asp.net version is more post-back aware.
No way. The only way to update an input is to do a complete post. It's better to use the object Session.
Related
I have page Searchbook.aspx which have 3 dropdowns and one repeater control which have button when i navigate to another page through that button to another page .when i click the back button of browser first page get default values instead of searched values. i want to restore the searched values.
You can switch on the history of the browser for update panel requests by setting the switch EnableHistory=true in the ScriptManager.
Here is a code sample that might help...
<asp:ScriptManager ID="scm" runat="server"
EnableHistory="true"
OnNavigate="scm_Navigate"
/>
<div>
<asp:Button ID="btnSubmit" runat="server" Text="Click Me!"
onclick="btnSubmit_Click" />
<asp:UpdatePanel ID="upl" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:Label ID="lblTime" runat="server" />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnSubmit" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
Here is the source: http://aspnetpodcast.com/CS11/blogs/asp.net_podcast/archive/2008/06/15/asp-net-podcast-show-116-using-the-history-functionality-with-the-asp-net-ajax-updatepanel-in-net-3-5-service-pack-1-beta-1.aspx
UPDATE
You can also use this method for adding a history point in browser.
http://msdn.microsoft.com/en-us/library/system.web.ui.scriptmanager.addhistorypoint(v=vs.100).aspx
Maybe this answer on SOF can also help...
https://stackoverflow.com/a/365746/217757
UPDATE 2
This blog post from Scott Gu sums it all...
http://weblogs.asp.net/scottgu/Tip_2F00_Trick_3A00_-Enabling-Back_2F00_Forward_2D00_Button-Support-for-ASP.NET-AJAX-UpdatePanel
If you want to restore the searched values on browser back button, then there are two ways to solve.
Keep the filter values selected by user in ViewState.
=> In this case always bind you data by implementing conditions which get from viewstate.
Or keep the values for filter data in query string.
=> In this case when user selected filter criteria put values in query string and bind data by putting condition with value fetched from URL query string.
Both above process can solve your purpose but the second one will be efficient and fast as putting values in Viewstate will slow down page.
Please let me know if I am not able to get you issue properly.
Update -
You can use Viewstate method as you are using update panel and using query string make page refresh.
Viewstate is same as using Session variable, please see below code.
Add value in viewstate
ViewState.Add("filter1", DropDownList1.SelectedValue);
Get value from viewstate
string getvalue = ViewState["filter1"].ToString();
So when after selecting filter criteria when click on submit button set value in viewstate and on page load get the same value and bind your control using those values.
how to fill textbox in asp.net while i am typing in another text
.. changes in one textbox will affect in another textbox auto.. and without refreshing my page.
Ok, try this. You will need the AJAX Control Toolkit. So read the article Installing AJAX Control Toolkit 4 in Visual Studio 2010 to see how to install it in Visual Studio.
Then you need to add a ScriptManager to your ASPX page. You will need to add the following code:
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
What you then need to do, is add an UpdatePanel to your page. Inside this update panel, you need to place the textbox. This means that only the controls inside the update panel will refresh, and not the whole page. To do this, add the following code:
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<!--Add your Textbox Control to update here: Textbox1-->
<asp:TextBox ID="Textbox1" runat="server" ReadOnly="True"></asp:TextBox>
<asp:TextBox ID="Textbox2" runat="server" ReadOnly="True" ontextchanged="Textbox2_TextChanged"></asp:TextBox>
</ContentTemplate>
<Triggers>
<!--This is the textbox you will be typing text into: TextBox2-->
<asp:AsyncPostBackTrigger ControlID="Textbox2" EventName="TextChanged" />
</Triggers>
</asp:UpdatePanel>
The Trigger tells your page which control on the form needs to initiate the postback. Now in your .cs file, you need to add the event handler for the Textbox2 TextChanged event. Add the following code:
protected void Textbox2_TextChanged(object sender, EventArgs e)
{
// Set the text of textbox1 = textbox2
}
I hope that this helps.
No need for AJAX. JQuery is enough. The code will do it
$('#text1').bind('keyup', function(){
$('#text2').val($('#text1').val());
});
Assuming
text1 id of box writing into.
text2 textbox that text gets copied to
in .Net you will have to use client id to get the correct id so it may look like this
$('<%=text1.ClientID%>').bind('keyup', function(){
$('<%=text2.ClientID%>').val($('#text1').val());
});
Oh and wrap it up in $(document).ready as per standard. And of coures you need to include the JQuery library to your page.
No posting back or page refreshes at all. It's your lightest solution and easy to implement.
You will need to use Javascript to accomplish this. ASP.Net code runs on the server side, which means it cannot affect the page without a postback happening first. Read up on the OnTextChanged event and how to hook into it with javascript. There is a javascript library called jQuery which makes everything easier, though it isn't strictly necessary.
Use JQuery. You may need to make an AJAX call to the server if you are relying on a datasource such as a database to autofil this field.
I have the following ASPX code:
<asp:ScriptManager ID="ScriptManager1" runat="server" />
<asp:UpdatePanel runat="server" ID="UpdatePanel" UpdateMode="Conditional">
<ContentTemplate>
<asp:Button runat="server" ID="UpdateButton1" OnClick="NextImg_Click" Text="Update" />
<asp:Repeater runat="server" ID="urlsUpdateRepeater">
<ItemTemplate>
<!-- THIS WOULD BE A LOOP FROM HERE -->
<!-- OPENS RESULT ITEM DIV CONTAINER -->
<div id="result_item">
<a href="<%# Eval("myUrl") %>" target="_blank">
<%# Eval("urlPageTitle")%></a>
</ItemTemplate>
</asp:Repeater>
</ContentTemplate>
</asp:UpdatePanel>
I have a NextImg_Click() event which works fine.
I use this code for DataBind... what is the Update method?
urlsUpdateRepeater.DataSource = resultsCollection;
urlsUpdateRepeater.DataBind();
Everything would appear to be in order. But every time the Update button is clicked it re-renders the whole page instead of the partial-postback UpdatePanel only.
It is driving me completely mad as I can't see anything wrong with the code. Is there some simple thing I'm missing?! Please help!
The search and data is displayed correctly (inside the panel) it just will not do a partial postback.
Appreciate your help with my noob problems!
Because the button is inside your UpdatePanel's ContentTemplate, it is unnecessary to take any extra action to get a partial page postback.
Try removing the line from your Page_Load() method.
Taken from MSDN:
Use the RegisterAsyncPostBackControl
method to register controls outside an
UpdatePanel control as triggers for
asynchronous postbacks, and to
potentially update the content of an
update panel. To update an UpdatePanel
control programmatically, call the
Update method.
So, you're control (UpdateButton1) is inside the UpdatePanel, no need for the ScriptManager1.RegisterAsyncPostBackControl call - ditch it and your problem is solved.
The problem was that my <form> tag was nested further into the document than it's corresponding end tag (with Warning!)...
Upon moving my form tag - it worked!
Entirely my fault, thanks guys.
I have a csv importroutine which imports my CSV values into Sitecore. After this proces is done i want to show the errors in an asp:literal. This is not working, and I think this is because i need an updatepanel for this in order to be able to update text after the first postback (the csv upload / import).
I made this:
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
</ContentTemplate>
</asp:UpdatePanel>
and coded this:
string melding = string.Format("Er zijn {0} objecten geïmporteerd.{1}", nrOfItemsImported, errors);
ViewState["Melding"] = melding;
And i have a button. On the onclick of this button I have:
Literal literal = new Literal();
literal.Text = (string)ViewState["Melding"];
literal.ID = DateTime.Now.Ticks.ToString();
UpdatePanel1.ContentTemplateContainer.Controls.Add(literal);
PlaceHolder1.Controls.Add(literal);
When i now press the button i want to update the panel so that it will show my Literal with the errormsg on it. This however isn't happening. How can this be? I'm guessing it has something to do with my viewstate, i don't see keys on the viewstate after I press the button...
#Update:
I found the problem. I was storing information in a session, however the data for the key i was storing the information in was too large. This made the Session key empty. I was posting an empty string into my literal and therefore no information was shown. I am now looking for a better way to store my data and make it show in my updatepanel. I have tried Viewstate / Session / Cookies and none of it would work the way i wanted. When I am using a viewstate I am not able to store information. The viewstate (debugmode) shows count 0 and 0 keys ... Hope someone knows a good way to make sure that my errorstring (476kb) gets stored somewhere where i can easily post it to my updatepanel's literal.
If you are using a FileUpload control, then you cannot use the UpdatePanel to asynchronously update the panel. The file upload is a synchronous event, so you'll need to update the Literal control on the page after the upload completed during the next Page_Load event.
In your code, have you tried UpdatePanel1.Update();? Even though you have added a control, you still will need to "trigger" the update to the update panel.
See here for a possible similar issue: StackOverflow
I tried this code and on click of button I am able to get the literal text on web page. Can you provide with some more details .
I have an UpdatePanel with some checkboxes in it. I check them, and hit my Save button, but that causes the UpdatePanel to postback (refresh) and sets them all back to blank. The re-drawing method runs before the button code.
What is the correct way to have an UpdatePanel with checkboxes in that you can manipulate?
Example of code:
<asp:UpdatePanel runat="server" UpdateMode="Conditional" ID="updatePanel1">
<ContentTemplate>
<asp:CheckBox runat="server" ID="myCheckBox" Caption="CheckBox"/>
<asp:Button runat="server" ID="saveButton"
Caption="Save" OnClick="SaveButtonClick"/>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="saveButton" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
Make sure that:
UpdateMode of UpdatePanel is Conditional
SaveButton contained in Triggers-section as ControlID of AsyncPostBackTrigger
Your code behind should look like:
if(!page.ispostback)
{
re-drawing();
}
As when you hit Save button your re-drawing() method is called and it again refreshes your checkboxes. Asynchronous postback behaves and hit to page method the same as full postback, but refreshes the values in any updatepanels.
Also check this URL
http://ajax.net-tutorials.com/controls/updatepanel-control/
Make sure the Save button is inside the Update Panel, for a start, and if not, that is designated as a Trigger for the Update Panel, in the <Triggers> section of the Update Panel.
<asp:UpdatePanel ID="MyControlPanel" runat="server" UpdateMode="Conditional">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="SaveButton" />
</Triggers>
<ContentTemplate> ...
Can you show some code for your UpdatePanel?
If you use server controls to render checkboxes you should add EnableViewState="true" attribute to these controls and update panel.
If you have checkboxes that are not server controls, then remove them from update panel, include only server controls inside. This leads to keeping several updates panel on a page that's usually not a big issue.
Add a ScriptManager object to your page if you do not have one. Set EnablePartialRendering="true". Put your UpdatePanel anywhere else on the page and place the content you want ajaxified within a tag within your UpdatePanel.