i want to know how to program the checkbox checked inside treeview, i want to write code when user checks checkbox inside the treeview in asp.net, i got the event known as TreeNodeCheckChange event, i wrote a response.write() message inside it, but when i check the checkbox, nothing happens, does the asp.net treeview supports handling the checkbox from code behind.
Thanks in advance.
When u click on the check box the postback event won't fire, this is ootb settings. You have to check the checkbox first and then click on the checkbox title. Only then the postback event will fire.
Then in the code behind you can access the checkbox node properties using this :-
protected void someTree_TreeNodeCheckChanged(object sender, TreeNodeEventArgs e)
{
if (e.Node.Checked)
{
}
}
The other workaround (the more user friendly way) is to fire the postback immediately when the checkbox is checked. In order to do that you can follow this tutorial here:- http://www.keirgordon.com/post/PostBack-on-TreeView-Checkbox-Click.aspx
Hope this helps.
Try setting SelectAction="Select" on the TreeNode element.
<asp:TreeView ID="TreeView1" runat="server" OnTreeNodeCheckChanged="TreeView1_TreeNodeCheckChanged">
<Nodes>
<asp:TreeNode ShowCheckBox="true" SelectAction="Select" />
</Nodes>
</asp:TreeView>
Here is a nice walk-though:
ASP.NET TreeView and Checkboxes
Related
there. I have a gridview with a column of check boxes which was working when it was a small test project but when adding it to a page on my teams project it stopped firing the checkedChanged event. The check mark still appears or disappears but nothing fires. The only major difference is I was using an sqlDataSource object at first but for the new project i had to bind it to a database in the behind code.
Here's my html:
<asp:TemplateField HeaderText="Create Incident">
<ItemTemplate>
<asp:CheckBox ID="Selections" runat="server" ViewStateMode = "Enabled" OnCheckedChanged="CheckBox1_CheckedChanged" />
</ItemTemplate>
</asp:TemplateField>
and some simple behindcode:
protected void CheckBox1_CheckedChanged(object sender, EventArgs e)
{
Console.WriteLine("clicked!");
}
set AutoPostBack to True to enable post back
<asp:CheckBox ID="Selections" runat="server" ViewStateMode = "Enabled" OnCheckedChanged="CheckBox1_CheckedChanged" AutoPostBack="True" />
I found the solution. I added the conditional the block if(!page.isPostBack) around the stuff in my page load event.
Kept searching for about an hour till I found out that the actual reason why the OnCheckedChanged event was not firing on my page was due to duplication of names. Duh
An input control had a name 'submit' and there also exists a method in my JavaScript that is called submit(). The JavaScript interpreter was confused between the name of the control and a function, every time it needed to fire the event. Changed the name of the control and everything went back to working perfectly.
I have a webpage. At the top is a search bar that is inside a <form id="form1" runat="server">.
I also want to add a form on that same page that would allow users to register their details. Problem, ASP.NET only allows one form per page.
How can I achieve my goal? Any workarounds?
You can only have one server side form on a page.
If it is an option, you can have a client side form (without runat="server") with a separate action - this POST can go to a different page, where you will have to accessRequest.Form` to retrieve the values posted.
Another option is to use separate buttons for posting with different event handlers.
You can use the simple HTML form approach but there is the problem of always post the whole page back. or use mvc:
Are multiple forms on a single page supported in asp.net 3.5?
Put the code you want to be called in different button click events. Therefore, if the search button is clicked, only the code in the search buttons click event is run. If the register button is clicked, only the code in the registers click event is run.
Here is an example:
protected void Page_Load(object sender, EventArgs e) {
// Common code
}
protected void btnSearch_Click(object sender, EventArgs e) {
// Search code
}
protected void btnRegister_Click(object sender, EventArgs e) {
// Register code
}
Double clicking the buttons in the designer will create the click events in the code behind.
As already stated in the answer by #Simon, it's easy to have multiple click handlers in your code-behind to process exactly what you need on the page - this is the easiest way to solve the "lack of multiple forms" issue.
Something very useful in this situation is the DefaultButton attribute of the <asp:Panel> control. This means that should you have multiple areas of your page with (for instance) <asp:TextBox> controls, and each of those areas has a specific <asp:Button> associated, if the focus is in one of the textboxes then pressing Return or Enter will result in the DefaultButton being clicked.
For example...
<asp:Panel runat="server" DefaultButton="btnSearch">
Search: <asp:TextBox runat="server" id="txtSearcn"/>
<asp:Button runat="server" id="btnSearch" Text="Search" OnClick="btnSearch_Click"/>
</asp:Panel>
See MSDN for more information on the DefaultButton attribute of <asp:Panel>
I'm trying to fire an event when a user clicks a hyperlink. But it would complain that the event is not defined:
<asp:HyperLink ID="HyperLink1" onmouseover="btnSubmit_Click" runat="server">www.google.com</asp:HyperLink>
<asp:Button
id="btnSubmit"
Text="Submit"
Runat="server" />
protected void btnSubmit_Click(object sender, EventArgs e)
{
btnSubmit.Text = "clicked a link!!!";
}
I see several problems.
You do not have any sort of click event setup on your hyperlink. You do have a "onmouseover" but based on MSDN's documentation there is no click event for that control.
You have a button defined, but no events associated with that button.
You have a function that appears to be an event handler, but the naming convention suggests that it is associated with the button that has no events.
Can you provide more detail of what you are trying to do? I assume the c# code you have posted resides in the code behind?
Update:
Try changing your code to this -
<asp:LinkButton ID="lb_Link" OnClick="btnSubmit_Click" Text="www.google.com" runat="server" />
Obviously this will not redirect you, but based on what your code does, it doesn't sound like you want a redirect...
The event you're trying to trigger is a server side event. You need to use client side code for what you want to do. Plus, there is no property known as onmouseover, you can add it as a client side event from code behind
HyperLink1.Attributes.Add("onmouseover","yourClientFunction");//this can be done in page load
Earlier, I had a button control on my web page. but now I changed it to a CSS button suting my needs. Before this, the button control was performing code-behind operation but now I switched to this CSS button.
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How can I accomplish the same code-behind process now?
You can change the anchor to be a server side control (turning it to a HtmlAnchor control) and use the ServerClick event:
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To keep it simple, you could use a linkbutton and get the server side click event
<asp:LinkButton ID="lb1" runat="server" onclick="lb1_Click" CssClass="cssClass" />
In visual studio 2008 when I drag and drop asp controlXXX on aspx page. Property page for this control, does not show event handlers button. It can reappear after switching to designer view but then disappears again. Screenshot attached.
Yes, that's annoying, but it works probably only in designer.
But you can still add event handlers manually
in html add onclick property and write name of the method
<asp:ImageButton ID="btnAdd" runat="server" onclick="btnAdd_Click" />
and in code-behind add method with two parameters of types: (object, EventArgs) like this:
protected void btnAddTag_Click(object sender, ImageClickEventArgs e)
{
}
or you can also add event handler in Page_Init method
btnAdd.Click+=new ImageClickEventHandler(btnAdd_Click);
(this will also generate automatically the method, only after += press TAB twice)