I am trying to build a site with a "Next" button to display next question on the same page without reloading the page or redirecting to another page but I can't figure out how!
You could use an UpdatePanel and a Scriptmanager.
<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<fieldset>
<asp:Label ID="Label1" runat="server" Text="Question 1"></asp:Label>
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
</fieldset>
</ContentTemplate>
</asp:UpdatePanel>
And in code behind just do what you always do
protected void Button1_Click(object sender, EventArgs e)
{
Label1.Text = "Question 2";
}
You will find that the text of the label changes when the button is clicked without a page refresh.
Related
I have one master page and one web form selected with that master page.
In this web form I take two text boxes and one label.
Code I wrote in C# file [aspx.cs] as follows :
protected void TextBox1_TextChanged(object sender, EventArgs e)
{
Label1.Text = "Welcome " + TextBox1.Text;
}
I don't want to keep AutoPostBack propery because when I press tab button then its value fires and appears to the label so that I don't want AutoPostBack property.
From internet i see the code for updatepanel and scriptmanager.
In updatepanel i write trigger tag but also it is not working.
my ASPX file :
<asp:ScriptManager ID="ScriptManager1" EnablePartialRendering="true" runat="server">
</asp:ScriptManager>
<asp:TextBox ID="TextBox1" runat="server" ontextchanged="TextBox1_TextChanged"></asp:TextBox>
<asp:TextBox ID="TextBox2" runat="server" ontextchanged="TextBox2_TextChanged"></asp:TextBox>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="TextBox1" EventName ="TextChanged" />
</Triggers>
<ContentTemplate>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
</ContentTemplate>
</asp:UpdatePanel>
so how to fire TextChanged event.
On click on button function are not getting fired. Why this is happening.
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdateProgress ID="UpdateProgress1" runat="server"
AssociatedUpdatePanelID="UpdatePanel1">
<ProgressTemplate>
<asp:Image ID="Image1" runat="server"
ImageUrl="~/images/ajax-progress.gif"
/>
<br />
Please Wait. This will take few minutes.
</ProgressTemplate>
</asp:UpdateProgress>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:Button ID="btnUpdate" runat="server"
Text="Update"
onclick="btnUpdate_Click"
Width="100px" />
</ContentTemplate>
</asp:UpdatePanel>
code behind :
protected void btnUpdate_Click(object sender, EventArgs e)
{
trunc();
ConsumerUpld(FileUpload1);
}
ConsumerUpld(fileupld) function updates table in database
Everything seam fine, so I tested your code by replacing it by a btnUpdate.Text = "updated";
protected void btnUpdate_Click(object sender, EventArgs e)
{
btnUpdate.Text = "updated";
//trunc();
//ConsumerUpld(FileUpload1);
}
Everything run smoothly, so your problems is within one of the 2 functions you call.
When an error occurs during an async postback, it show on the button of the browser page (the way it show depend of your browser). You should try to debug it with breakpoints or comment out the update panel to see what is happening.
I've got a webform with two update panels:
<asp:ScriptManager ID="ScriptManager1" runat="server" ScriptMode="Release">
</asp:ScriptManager>
<p>
<asp:UpdatePanel ID="upl1" runat="server">
<ContentTemplate>
<asp:Button runat="server" ID="btn1" Text="Button1" />
</ContentTemplate>
</asp:UpdatePanel>
<asp:UpdatePanel ID="upl2" runat="server">
<ContentTemplate>
<asp:Button runat="server" id="btn2" Text="Button2" />
</ContentTemplate>
</asp:UpdatePanel>
</p>
If I click btn1, then the load event of upl2 is triggered, as well as upl1.
I would expect only upl1 to be loaded, since this is the update panel that contains the button.
Why isn't this happening, and how can I make it happen?
One pratice I always use when I work with Update Panels, is to set the properties: ChildrenAsTriggers="false" UpdateMode="Conditional"
And refresh the Update Panel only when I want:
protected void btn1_Click(object sender, EventArgs e)
{
// some logic
// ....
upl1.Update();
}
Try applying these properties and see if it solves your problem.
I had a similar problem with a button triggering an UpdatePanel, and using ChildrenAsTriggers="false" UpdateMode="Conditional" didn't help.
I ended up using the following to force the button to do a regular post-back:
ScriptManager1.RegisterPostBackControl(btn1);
Following is my ASPX code.
<form id="form1" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
<asp:UpdatePanel UpdateMode="Conditional" ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:Label ID="lblid" runat="server" Text="Label"></asp:Label>
</ContentTemplate>
</asp:UpdatePanel>
<asp:Button ID="btnid" runat="server" Text="Button"/>
</div>
</form>
I have one update panel control and have included single lable control inside the update panel control. I have Button and Lable outside the update panel control and during page_load I update the the text value of both the lable control as follows.
protected void Page_Load(object sender, EventArgs e)
{
lblid.Text = DateTime.Now.ToString();
Label1.Text = DateTime.Now.ToString();
}
I have set Update mode property to 'Conditional' so that when Button control outside the Update panel is clicked by user, It should not change the text value of lable inside the ipdate panel. But it update and diplay the changed value of label text inside the update panel. My understanding is that when we set update mode property to 'Conditional', content inside the update panel is not updated(or rendred on client side) when there is a postback due to control outside the update panel then what is happening in my case.
Clicking the button outside of UpdatePanel is causing the entire page to postback. An UpdatePanel can't prevent the contents inside it from being refreshed in the case the when entire page is being posted-back.
if you have only one updatepanel it makes no sence
see this example where it does make sense.
try playing around with the second updatepanel by changing it from Conditional to Always
ASPX:
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<div>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:Label ID="lblid" runat="server" Text="Label"></asp:Label>
<asp:Button ID="btnid" runat="server" Text="Button" />
</ContentTemplate>
</asp:UpdatePanel>
<asp:UpdatePanel UpdateMode="Conditional" ID="UpdatePanel2" runat="server">
<ContentTemplate>
<asp:Label ID="Label2" runat="server" Text="Label"></asp:Label>
</ContentTemplate>
</asp:UpdatePanel>
</div>
CS:
protected void Page_Load(object sender, EventArgs e)
{
lblid.Text = DateTime.Now.ToString();
Label1.Text = DateTime.Now.ToString();
Label2.Text = DateTime.Now.ToString();
}
I have an update panel on a page, and am using __doPostBack on a control inside the updatepanel called from javascript to do a postback and update the panel.
Everything works fine, until I set enableviewstate=false on the page.
The javascript still fires, but nothing happens on the server side.
well i don't understand but where lies your problem but this worked for me with a quick code
<div>
<asp:ScriptManager ID="sm" runat="server" EnablePageMethods="true" EnablePartialRendering="true">
</asp:ScriptManager>
<div id="result">
<asp:UpdatePanel runat="server" EnableViewState="false" ID="udpnl" UpdateMode="Conditional">
<ContentTemplate>
<asp:Button runat="server" ID="btn" Text="UnClicked" OnClick="btn_click" />
</ContentTemplate>
</asp:UpdatePanel>
<input type="button" value="DoPartialPost" onclick="__doPostBack('btn','')" />
</div>
The code behind
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btn_click(object sender,EventArgs e)
{
btn.Text = "Clicked";
udpnl.Update();
}