I have a LoginView on a site master page that displays the username of the logged-in user. I modifies it to make the username a link to that user's settings, using a LinkButton.
I need to be able to conditionally enable or disable the LinkButton from within Page_Load. How do I get a reference to the LinkButton?
The LinkButton doesn't appear in the designer.cs file, but the LoginView does. I have tried looking at its controls property in the debugger and also tried using FindControl(LinkButton's ID) but that returns null.
--Jacob
You can't use the LogIn "as is", you have to create a LayoutTemplate inside the control.
<asp:Login ID="LoginUser" runat="server">
<%--the LayoutTemplate must include controls (with Text property)
with ID values UserName and Password--%>
<LayoutTemplate>
Your stuff here. Textboxes for user name and password, etc...
</LayoutTemplate>
</asp:Login>
Then you can find a control by
Label myErrorLabel = (Label)LoginUser.FindControl("logInErrorDetails");
Make sure that LinkButton is Asp.Net server control with "runat="server" attribute. If it is a server control then it should appear in your designer.cs file. Once it appeared in designer.cs file, you can access that control by its name or using FindControl method.
Some times Visual Studio IDE creates problem and it does not update desinger.cs file. Try to switch between designer view, mark up view and code view. It will update designer.cs file if the markup is correct.
I've made a few master pages in visual studio, and then a few implementing pages, and Visual Studio sticks ID attributes onto all of my tags:
<asp:Content ID="Content1" ContentPlaceHolderID="OtherContent" ></asp:Content>
What gives with the IDs? What are they good for? How do I access them from the code behind?
All controls that run on the server must have an ID attribute as a unique identifier. They are good for finding child controls and keeping the control hierarchy in place. If you have a TextBox that sits in a Panel that sits in an UpdatePanel that's in a WebUserControl that's in a ContentPlaceHolder that's in a Page, then all it takes is one of them not to have a proper ID attribute in order keep the connection between TextBox and Page.
In order to access it from the code behind you need to have the runat="server" attribute set on this tag.
I am a starter for asp .net. On my webpage, there are a few textboxes and a submit botton. Is there a easy way to get access the data and use it to built an object ? The textboxes has there names and ids, there should be a way to get access them by names and ids.
Edit
this is normal html control
<input type="text" class="text-box" id=xxx />
if you want to access it in your codebehind file you need to add runat=server attribute to this
<asp:textbox>
Other one is server side control asp.net control not html control
I think its better you read out basic of asp.net before stating programming because this is very basic question you should know about
prev
step 1:
make use of asp.net Textbox
<asp:Textbox id="textbox1" runat="server"></asp:Textbox>
Step 2:
for asp.net you just need to write in you codebehind file
object.proertyname = texboxid.Text;
Read more : TextBox Class
I have a Contact userControl that have "save contact" as submit button and fields inside form tag we repeat this userControl with Code 20 times in one page
My problem is the Form Tag in the first userControl is hiding somehow --- i checked the userControl with developer Tool IE9 , firebug Firefox7 and the Form is not appearing in the first userControl and its appearing with the rest 19 Controls
I tried to View Source and take html copy in new html file in VS -- i found form is exist
i dont know if iam clear enough but please advice if you need more info
If you're running a form tag at the server, inside a user control, and then displaying this user control more than once on the page, then you will have multiple form tags running at server on one page, which is not allowed by ASP.NET
Take the form tag outside of the user control like:
<form runat="server">
<uc:Contact />
<uc:Contact />
<uc:Contact />
</form>
I have a web application that has a page that loads the content from the database. I want to be able to put a form in the dynamic content, but .net doesn't let the inside form perform it's action. Is there a way to allow this or some other way I can get a form on a dynamic content page?
--EDIT--
I think I need to clarify something. This is an aspx page that loads content from the database. As far as I know, the text I pull from the db and stick in the Label is never compiled or processed by the .net wp, thus I can't use the code behind to fix this issue.
This is a common problem, when you want to have a non-postback form to a 3rd party site (like a PayPal button, for example).
The problem occurs because HTML doesn't let you have form within a form, and most ASP.NET pages have a <form runat="server" /> "high up" in the HTML (or in the Master page).
My favorite solution is to hide the "high up" form tag, while still showing all of the content. Then you can feel free to dump any tags you want in the body. If you do this dynamically you can choose on a page-by-page basis which pages have custom forms.
I created a class called GhostForm.cs to handle this. You can read all about it here:
http://jerschneid.blogspot.com/2007/03/hide-form-tag-but-leave-content.html
There can only be one form on the page (the asp form); you have to use that form somehow.
To clarify, there can only be one form processed.
Not with webforms, no. You have to work within the one, full page form by using an event handler connected to a Button to LinkButton. Fortunately, it's pretty easy to do:
foo.aspx:
...
<asp:TextBox id="txtFoo" runat="server" />
<asp:Button id="btnFoo" runat="server" onclick="btnFoo_Click />
...
foo.aspx.cs:
...
protected void btnFoo_Click(object sender, EventArgs e)
{
string s = txtFoo.Text;
// do something with s
}
...
Dino Esposito has an article from MSDN magazine that covers handling multiple forms or "simulating" sub forms in ASP.Net that might just answer all your questions.
http://msdn.microsoft.com/en-us/magazine/cc164151.aspx
Any work around would be hacky and very ugly. By design asp.net uses a form tag to post and get data. This is why they call it a Web Forms Application. Html does not allow nested forms. What you want to do is use a WebRequest in your code behind.
If you are trying something like a paypal button you could simply use something like this.
Markup:
<div id="PayPalButtonContainer" runat="server"></div>
Code Behind:
public static string GetPayPalButtonMarkup()
{
const string markup = #"https://www.paypal.com/cgi-bin/webscr
?cmd=_xclick&business={0}
&item_name=Widget
&amount={1}
¤cy_code=USD";
return markup;
}
PayPalButtonContainer.InnerHtml = string.format(GetPayPalButtonMarkup,"YOUR PAYPAL USER NAME", "YOUR PRICE VALUE");
you either have to deal with the postback by adding a server side click event handler to what you want to be the "sub forms" submit button (this is how web formas deals with multiple submit type buutons on the same page) or do soemthing clever with AJAX if you dont want a full post back
I've run across this issue before. One workaround that I have done is to place my code that I want my action to be done upon inside of an asp:Panel. With the panel you can set the attribute of "DefaultButton" to a button inside of the panel, and clicking the button (or pressing "enter") will fire that button's click event. I've found this quite handy when wanting to submit a "form" by pressing enter when I have a master page that contains the only allowable asp:Form.
Hope this helps.
When I first came across this problem, I found the simplest solution for me was to simple COPY and PASTE the Master page and give it a slightly different name, something like:
SiteNameMasterPage 'Default page with FORM tag
SiteNameMasterPageNF 'No Form tag
And then depending on wether I wanted a FORM tag or or not, simply change the masterpage link at the top of my CONTENT-PAGES, like this
<%# Page Title="" Language="VB" MasterPageFile="~/SiteName.master" %>
<%# MasterType VirtualPath="~/SiteName.master" %>
<!-- This masterpage has the default FORM tag -->
or
<%# Page Title="" Language="VB" MasterPageFile="~/SiteNameNF.master" %>
<%# MasterType VirtualPath="~/SiteNameNF.master" %>
<!-- This masterpage does NOT have the default FORM tag -->
and then in the content page, wherever I want to place my form I can include the <form> tag