I have a div like this:
<div id="1" class="2" no="3" type="4"></div>
i want get property no and type in ASP.net.
please help me.
Add the runat="server" attribute to the div and access the other attributes in code-behind like this: string attr = divId.Attributes["attrName"];
If you are adding the attributes with javaScript, make sure to run this code after the javaScrip has added them. Otherwise you might get a null refference exception.
add tag runat="server" and then in c# divid.yourproperty
Related
I have a div element in my HTML. I added a id and runat attributes to the element:
<div id="footer" runat="server">
After rendering, viewing the HTML shows:
<div id="ctl00_footer">
However, I cannot access it from the page's .aspx.cs code:
footer.InnerHtml += "test";
How do I access that element from the C# code?
you can use FindControl("footer"), and cast it to HtmlGenericControl.
HtmlGenericControl footer = (HtmlGenericControl)FindControl("footer")
One of the reasons can be that you don't have designer file for that page. So you can't access element by it's ID.
Just add class with name [your page name].aspx.designer.cs, open it, remove all code, save it, go to your view and click save - designer must generate code of all elements from your view. After this you can access element by ID.
There should be no problem accessing <div id="footer" runat="server"></div> the way you are doing. Strange though, my generated markup keeps the div id unchanged as footer.
Make sure you don't have any compile errors, and that you can access other elements running server-side in the same scope you are trying to access this div.
You need to set the ClientIDMode property of the page or control to Static:
http://msdn.microsoft.com/en-us/library/system.web.ui.control.clientidmode.aspx
This will prevent the "ctl00_" from being appended to the ID which is what is causing you the problem.
I have encountered this problem before. You may have the target div inside another div that does not have the runat="server" attribute. All nested divs should have the runat attribute in order to be able to access the inner elements.
<div id="divContainer" runat="Server">
<div id="yourDiv" runat="Server">
</div>
If you're going to code ASP.NET and you want to access the control from the server-side, you may as well use the provided controls.
Use a Panel instead of a Div. The ASP:Panel control renders as a div in the generated html anyway. The Panel doesn't have a .Text property, but you can add controls to it from code-behind (such as a Label or a LiteralControl.
Is there possibly a chance that the page was copy/pasted when being created? If so, make absolutely sure that all references to the old page are changed to the name of the new page. I've done this before within the code at the top of the ASPX page, as well as the namespace of the designer page.
I had the same problem and found out that due to a "copy" and "paste" my function had a "static" declaration.
Removed it since static functions can't access non-static identifiers and it was fixed.
I have the same issue.
My solution was to have 'ID' instead of 'id' for the div element (i.e. the casing was the reason).
I am trying to create a product review web page. The product review has product image, title, description, etc, in a SQL database. How can I load this datas into an HTML div tag, using ASP.NET?
Add the following to your div
<div runat="server" Id="dataDiv"></div>
And then in your CodeBehind you can call your div with its Id
dataDiv.InnerHtml= YourData;// this can be anything from database or a variable
hope it helped.
Thanks,
Aneef
You can add an ID property and runat="server" to <div> to be able to reference it from code behind, and add HTML using the InnerHtml property.
You can also use an <asp:Panel> control, which emits a <div>, and insert your HTML by adding a Literal control from code behind that contains your markup. That approach also allows you to add controls to the <div>, should you need to.
know ASP since about 6 months, and I've go hard problem. I've created my own DataBinding mechanism and I need some solution to do somthing like this:
I have this example code in my ASPX
<myButton id="someID" runat="server" Text="SomeText" BackColor="{SomeContext}" />
and I have in this control my property Context of type Object. I want to bind property which is inside Context to BackColor property. Name of the property from Context is SomeContext (in brackets). All I need is to use some TypeConverter or other technology to identify that there is a name inside {} and remember that name inside instance of myButton control. Any ideas???
I thought that I can use my own class inherited from TypeConverter and catch the moment of converting value {SomeContext} to Color (the BackColor property). I can catch this moment, but I have no info about target control, only empty context of String value. If anyone know how to get target property somehow, will be very!! helpful.
I've been searching web, and nothing...
You can set this in your code behind directly:
someID.BackColor = context.Color;
Ya might give ASP.NET Custom Expression builders a try.
I won't use codebehind in my project. Website will be rendered from compiled customized aspx from database. I have special approach for my system, and my binding is a main part of it. Regular databinding expression won't help because it use ASP binding, which I don't want to use.
Unfortunately I didn't find any solution of my problem, so I decided to use inner properties. I'll use ASPX code like this:
<myButton runat="server" ID="someID">
<Binding>
<Bind Target="BackColor" Source="ColorOfBackgroundFromContext" />
<Bind Target="ForColor" Source="ColorOfForegroundFromContext" />
</Binding>
</myButton>
It seems everyone is doing this (in code posts etc.)...but I don't know how. :(
Whenever I try to manipulate an asp element using JavaScript I get an "element is null" or "document is undefined" etc. error.....
JavaScript works fine usually,...but only when I add the runat="server" attribute does the element seem invisible to my JavaScript.
Any suggestions would be appreciated.
Thanks, Andrew
What's probably happening is that your element/control is within one or more ASP.NET controls which act as naming containers (Master page, ITemplate, Wizard, etc), and that's causing its ID to change.
You can use "view source" in your browser to confirm that's what's happening in the rendered HTML.
If your JavaScript is in the ASPX page, the easiest way to temporarily work around that is to use the element's ClientID property. For example, if you had a control named TextBox1 that you wanted to reference via JS:
var textbox = document.getElementById('<%= TextBox1.ClientID %>');
Making an element runat="server" changes the client-side ID of that element based on what ASP.NET naming containers it's inside of. So if you're using document.getElementById to manipulate the element, you'll need to pass it the new ID generated by .NET. Look into the ClientId property to get that generated ID...you can use it inline in your Javascript like so:
var element = document.getElementById('<%=myControl.ClientID%>');
If you have a textbox:
<asp:TextBox id="txtText" runat="server" />
YOu can use:
var textBox=document.getElementById('<%=txtText.ClientID %>');
Any WebControl exposes the same ClientID property.
All though the question has been answered, thought I would just post some further info...
Rick Strahl provided quite an intresting work around to this problem.
http://www.west-wind.com/WebLog/posts/252178.aspx
Thankfully when ASP .NET 4.0 arrives, it will allow you to specify exacly what the client ID's will be!
http://www.codeproject.com/KB/aspnet/ASP_NET4_0ClientIDFeature.aspx
After trying to understand why client code is not rendered in a page (injected by user control) I found this link, it turns out you must have a form tag for it to work (Page.RegisterClientScriptBlock did declare this but ClientScriptManager.RegisterClientScriptBlock which I use does not say anything regarding this).
I am using Visual studio 2005.
Does anyone know if this has been solved?
Edit:
To clarify, I want my control to add javascript code to the head section of the page without having to use the
<form runat="server"
I have tried adding it using:
HtmlGenericControl x = new HtmlGenericControl("script");
x.InnerText = "alert('123');";
Page.Header.Controls.Add(x);
But this did not work for me.
As far as I know this functions the same in current versions, you can test it very simply though.
Update
per discussion in the comments, the only "workaround" that I could think of would be for your to manually insert the script into the "head" section of the page on your own, using a runat="server" declaration on the Head element.
Got it!
My mistake was not doing it in the OnPreRender method (I used the Render method).
Now all that is needed is - like Mitchel Sellers wrote, set the header to runat server and than add to it's controls:
HtmlGenericControl x = new HtmlGenericControl("script");
x.InnerText = GetScriptSection();
Page.Header.Controls.Add(x);
Thanks for pointing me to the right direction!
The MSDN Page for registerclientscriptblock here says:
The client-side script is emitted just
after the opening tag of the Page
object's <form runat= server> element.
The script block is emitted as the
object that renders the output is
defined, so you must include both tags
of the <script> element.
If you do not want to include a form, than you will basically need to build your own implementation of it.
Minor clarification for anyone seeing this:
The form tag must have the runat="server" attribute set, e.g.
<form id="theform" runat="server">
Just placing a regular HTML form tag in the page will not help.