I've created a simple ASP.NET 4.0 application to see how rendered client ids will vary if I change controlRenderingCompatibilityVersion in web.config and ClientIDMode attribute of the control.
Now I've set <pages controlRenderingCompatibilityVersion="3.5"/> and <asp:Label runat="server" ID="Message" ClientIDMode="AutoID" /> and expect to find in the generated markup asp.net-3.5-style ClientID (something like id='ctl00_Message'),
but I see this <span id="Message">Hello world!</span>.
Why does not ASP.NET render it as a 3.5-style id?
If the span is on it's own, then there is no reason to change the ID.
It depends if the control is inside another control. If the span above is inside a Repeater, DataList etc, then the Id will change.
Related
To use AngularJS validation status I need to reference the form by its name. However the form that I have does not have a name, and I have no idea how to set a name, other than using Javascript, which I don't want to do. When I add the name attribute to the <form runat="server"> it doesn't appear in the output HTML.
Example of how it would be ideal to work:
<form name="form">
<div ng-app="myApp" ng-controller="myCtl">
First Name: <input type="text" name="firstName" ng-model="firstName" required><br>
<span ng-show="form.firstName.$dirty">Dirty</span>
</div>
</form>
A solution would be either of these two:
Reference the form elements by ID instead of name
Get ASP.NET webforms to output the name attribute
ASP.NET controls have been modified in the .NET Framework version 4.
The HtmlForm control does not render a name attribute anymore.
To disable the new rendering mode, add the following setting in the Web.config file:
<system.web>
<pages controlRenderingCompatibilityVersion="3.5" />
</system.web>
You can add an attribute to a web forms control from the code behind using:
controlName.Attributes.Add("name","value");
<asp:TextBox ID="controlName" runat="server"/>
Or if you want to use Ids with .NET 4 you can set the attribute ClientIDMode eg
<asp:TextBox ID="controlName" runat="server" ClientIDMode="Static"/>
then you can reference it by ID
HTH
use jQuery to modify the form tag
$('#form').attr('name', 'form');
I have an ASP.NET 2.0 web application, and on one of the pages I have a div defined like this:
<asp:Panel runat="server" ID="pnlAddJobCode" Visible="false" ClientIDMode="Static">
and it's inside of a content placeholder defined like this:
<asp:Content ID="Content3" ContentPlaceHolderID="MainBodyContent" runat="server">
but when the HTML is generated I get a name like this ctl00_MainBodyContent_pnlAddJobCode so clearly it's not honoring the ClientIDMode. The problem is I need to set some styles on this specific div -how can I get the ClientIDMode to work here?
Does ClientIDMode not work in ASP.NET 2.0? I have found a few articles on Google that elude to it not working, but nothing concrete.
Client ID Mode is new in ASP.NET 4.0. There's more information about it in the breaking changes for ASP.NET v4.0.
If I have a TABLE or a DROPDOWNLIST, with an ID="Test", in a Page Default.aspx, contained in a Master Page, these controllers change their ID's to "MainContent_Test", means any CSS attributed to #Test won't work, and I feel that I'm having problems in C# as well, why does this happen? and How can I prevent it?
If you are using asp.net 4 and above you can set the ClientIdMode of the control
This will ensure that it won't change and can be assessed via css.
<asp:DropDownList ClientIdMode="Static" ID="Test" runat="server"/>
ASP.NET adds name of control containers to generated client ID. But if you use .NET 4.0 or later you can use cotntrol's ClientIdMode property:
http://msdn.microsoft.com/en-us/library/system.web.ui.control.clientidmode(v=vs.100).aspx
Just set it to Static and the ID will not change.
Other options may include defining style via class and not attaching it to specific control ID.
Does anyone know why ASP.NET 4 has dropped the ctl00 prefix on ASP controls?
Is there a setting I have missed?
In ASP.NET 4.0, they've introduced support for cleaner HTML syntax. You can read about it at Scott Gu's blog. If you want the classic model for Client IDs, you can adjust your web.config:
<configuration>
<system.web>
<pages controlRenderingCompatibilityVersion="3.5" />
And that'll make upgrading your application easier. You can change this per control (and per page) by using the Control.ClientIDMode property, which can also be set in the web config:
<configuration>
<system.web>
<pages clientIDMode="AutoID|Predictable|Static|Inherit" />
AutoID renders the controls with the classic ASP.NET 2.0 model.
As far as i remember its up to ASP.NET to decide which prefix to use.
Its a bad practice to reference on the controls with hardcoded id value.
You should use ClientId property that will always generate you proper Id:
<td class="tmarg10" style="width: 150px">
<label for="<%=txtName.ClientID %>">
Name of the mall group :</label>
</td>
<td class="tmarg10">
<asp:TextBox ID="txtName" runat="server" Columns="90" /> <br />
</td>
In the example above, its calculating proper ID of the textbox and putting it into label attribute. In this way you will no more worry about keeping the same id of the control.
If you just want to add 'ct100' prefix to your control's IDs, add Master page to your WebPage. But how said above, try to avoid using hardcode with controls ids in your sources and read Metthew's comments for generation custom ID
Not a setting, but a decision by MS to simplify the way IDs of controls within containers are transformed to the client.
Here is a blog post by Scott Guthrie explaining the changes. The reasoning behind it:
Clean, Standards-Based, CSS-Friendly Markup
Is it possible to set a specific ID on an ASP.NET server control? Everytime I assign an ID and run the web form the ID changes.
For Example:
<asp:TextBox ID="txtName" runat="server"></asp:TextBox>
Gets translated into this:
<input id="ct100_ContentPlaceHolder1_txtName" type="text" />
I think this is do to me using master pages, but if so how can I be sure a control will have a certain ID(for javascript purposes). I placed the auto-generated id in my javascript and it is working, but I would prefer to have used the id's that I originally assigned them. Is this possible?
(This is for version:ASP.NET 3.5)
Starting with .NET 4 you have greater control about how the client-side IDs look like (see this post for details).
To force a specific client-side ID, you have to set the ClientIDMode to static. The following will render an <input> element with id="txtName":
<asp:TextBox ID="txtName" ClientIDMode="static" runat="server"></asp:TextBox>
Although if you do this, you have to ensure that you don't have two controls with identical client-side IDs. Check the article linked above for other options.
This is the way web controls ID's are in .NET prior to version 4.0. Version 4.0 introduces client IDs, which you can read about here.
You can use somthing like this in your JS:
var something = '<%= txtName.ClientID %>';
You can use the Control.ClientID property in your codebehind to get the actual id after it's been added to the control tree.
Super annoying choice made by the asp.net webforms people.