When I add ListItems to a RadioButtonList in code-behind, the labels are rendered after the input and placed inside a TD by ASP.NET.
<td>
<input type='radio' id='site123' name='groupname' value='123' />
<label for = 'site123'>this is a long label that wraps</label>
</td>
Is there a way to control how ASP.NET renders the markup, either selectively or globally? I'd like to have the input inside the label:
<label><input .... /> </label>
You can use a Control Adapter. They allow you to override the html rendering of any ASP.Net control. Aside from the link, I have a simple example in another question here:
Dropdownlist control with <optgroup>s for asp.net (webforms)?
Since you asked about doing this selectively, you would need to inherit a control from RadioButtonList, and then attach your control adapter to the inherited control, instead of RadioButtonList itself.
Related
I have a simple ASP.NET page with a MasterPage. Within the MasterPage, I have two login fields:
<input type="text" runat="server" id="txtUserName"/>
<input type="text" runat="server" id="txtPassword"/>
When the controls are rendered to the page, ASP.NET renders the following:
<input type="text" runat="server" id="ctl00_txtUserName" name="ctl00$txtUserName"/>
<input type="text" runat="server" id="ctl00_txtPassword" name="ctl00$txtPassword"/>
If I understand correctly, the name attribute corresponds to the UniqueID property of a control. However, when I'm debugging Page_Load and attempt to view the UniqueID of these fields, they have different values (ctl0$txtUserName and ctl0$txtPassword respectively)!
Note that this does not seem to be an issue on all pages using this MasterPage. Most of them work correctly and use ctl0$txtUserName and ctl0$txtPassword in both rendering and Page_Load.
Any idea what might cause ASP.NET to render a different UniqueID for a control than it uses in Page_Load?
I'm still not sure what was causing the generated UniqueIDs in the MasterPage to be different in Page_Load than when rendered to the page. However, I was able to get around the issue by storing the UniqueIDs of these fields in hidden fields. I was then able to access the values directly in the Request.Form collection.
In other words, I did this:
In the MasterPage -
<input type="text" runat="server" id="txtUserName"/>
<input type="text" runat="server" id="txtPassword"/>
<input type="hidden" id="txtUserNameUID" value="<%=txtUserName.UniqueID%>"/>
<input type="hidden" id="txtPasswordUID" value="<%=txtPassword.UniqueID%>"/>
During Page_Load of the child page -
string username = Request.Form[Request.Form["txtUserNameUID"]];
string password = Request.Form[Request.Form["txtPasswordUID"]];
Hope this helps anyone else struggling with UniqueID weirdness in ASP.NET!
Weird quirk I just became aware of: any wrapping controls that are runat server must also have IDs. For instance, if you have a panel around the control, i.e. whatever "ctl00" is, it must be assigned an ID. If it is not set, it will be allocated one and this can change.
Hi All
I need a CheckBox Dropdown list control in asp.net i have seen the Jquery control provided in
http://dropdown-check-list.googlecode.com/svn/trunk/doc/dropdownchecklist.html but i also need Hierarchy in that control
*Animal
*Vertiberates
*Aunts
*Plants
*Fungi
Is there any control other than this which can provide this functionality
When I was working on similar requirement, I have used "Popupcontrol" from Ajax Toolkit.
Here is more info http://www.asp.net/ajax/ajaxcontroltoolkit/Samples/PopupControl/PopupControl.aspx
Basically, you can create a panel, add all your controls (for example a treeview in your case) and put a textbox which would invoke the panel using the Popupcontrol extender.
I don't know of a control but you can get most of that functionality with a div with a scroll bar. like this.
<div style="width:75;height:75;overflow:auto">
<input type =checkbox ">a<br>
<input type =checkbox ">b<br>
<input type =checkbox ">c<br>
<input type =checkbox ">d<br>
<input type =checkbox ">e<br>
<input type =checkbox ">f<br>
</div>
I want to add a custom attribute to an asp.net RadioButton called Key which I'm using client-side for an ajax request.
What I'm finding is that my aspx markup which is the following:
<asp:RadioButton ID="rdoPost" GroupName=PreferredContactMethod" value="Post" onclick="DoStuff(this)" runat="server" />
gets rendered in the page as
<span Key="ContactMethod">
<input id="rdoPost" type="radio" name="PreferredContactMethod"" value="Post" onclick="DoStuff(this);" />
</span>
whereas I'd expected (and hoped) to get the following
<input id="rdoPost" type="radio" Key="ContactMethod" name="PreferredContactMethod"" value="Post" onclick="DoStuff(this);" />
I've tried the same thing with an asp TextBox control and it works exactly as I'd expect simply adding the Key="myKey" attribute to the <input type="text"/> element.
Is there a way around this with the standard RadioButton control, or will I have to inherit from the standard one to achieve the markup I'm wanting?
Also... (sorry to ask two questions at the same time), is adding non-standard attributes to html markup a bad idea anyway? Currently I'm using these attributes in JavaScript in the following way:
var key = rdoPost.Key;
I've found from the question/answer below that the easiest way to do this is via the code-behind using the InputAttributes property as follows:
rdoPost.InputAttributes.Add("class", "myCheckBoxClass");
Why does ASP.Net RadioButton and CheckBox render inside a Span?
Using jQuery I want to be able to click an element which will also checks it's related radio button. I had this working fine until we had to add runat="server" to the radio buttons.
When I apply this it prevents my jQuery function from working and I cant figure out how to get round it, heres a simplified version of the code:
HTML
<input type="radio" runat="server" id="sector1Radio" name="SectorGroup" title="Sector1" />
jQuery
$('#SomethingElse').click(function() {
$('input[title=Sector1]').attr('checked','checked');
});
I've found out that when its converted to a .net control instead of checked="checked" (as it would be usually) it is just Checked, so I changed that but on inspecting the DOM in multiple browsers, none of my radio buttons are being checked :-(
Are there any other ways I can use jQuery to check a radio button that has runat="server"?
Cheers!
I think that Your problem is that the id of the input is no longer sector1Radio but rather ctl00_sector1Radio or something similar. This happens if Your input control is inside e.g. a ContentPlaceHolder control (when using master pages).
Can You check the generated HTML code (in the browser) to verify if this is the case? What is the id of the input control?
If this is the case, You need to generate Your js jQuery code
$('#SomethingElse').click(function() {
$('input[title=Sector1]').attr('checked','checked');
});
from codebehind so that SomeThingElse is replaced with the ClientID of the control.
.is(':checked') works on ASP.NET radiobuttons and checkboxes
$('#SomethingElse').click(function() {
$('input[title=Sector1]').is(':checked');
});
try using
$('input[title=Sector1]').attr('checked',true);
and
$('input[title=Sector1]').attr('checked',false);
or maybe
$('#SomethingElse').click(function () {
$('input[title=Sector1]').attr('checked',!$('input[title=Sector1]').attr('checked'));
});
As suggested by others, ASP.net will not generate the html with the same ID you specified.
Quick solutions:
You can keep using the id but asks jquery to check the end of the id instead, example:
$("input[id$='sector1Radio']").is(":checked");
Or check against the title and name as Nico suggested
Use the class element which is not effected by ASP.net, example
<input type="radio" runat="server" id="sector1Radio" class="sector1Radio" name="SectorGroup" title="Sector1" />
$("input.sector1Radio").is(":checked");
Best thing is to view the generated html code and see what id is giving you, then you can use the appropriate jquery selector, because the generated id could have different extensions depends whether you use master pages, etc.
If you are using a MasterPage or are creating the controls dynamically then it is probable that the control ID's are being renamed #SomethingElse becomes #MainContent_SomethingElse.
The easiest way to check this is to use the WebDeveloper plugin for Firefox or Chrome.
Go to Information -> Display Element Information and then select the object in question. It will give you it's ID, class, as well as ancestor and children information.
Check to see if the ID is being changed dynamically by the .NET.
If that's the case:
To prevent this, in the server side code you can use the following attribute to create static ID's
SomethingElse.ClientIDMode = ClientIDMode.Static;
You can then reference in you jQuery
$('#SomethingElse').click(function() {
if ($('input[title=Sector1]').attr('checked')) {
//execute event
});
I think what happens is that in ASP NET Checkboxes and Radio Buttons generates an "input" and a "span" after the input. So you need to select the input only.
You can try:
$('.classname input[type=checkbox]').each(function() {
this.checked = true;
});
Two things here: finding the control and executing the check. In ASP.NET, your control's actual ID and name will end up getting changed based on the runat="server" containers in which it appears, even if those containers have no Ids.
Rendered ASP.NET controls always end with the same name as you started with, so a tag like:
<input type="radio" runat="server" id="sector1Radio" title="Sector1" />
might end up being rendered as
<input type="radio" runat="server" id="ctl0$ctl0$sector1Radio" name="ctl0_ctl0_SectorGroup" title="Sector1" />
You can find this element, even after it is rendered if you use the "contains" selection syntax in JQuery. So to find this element, once rendered, you could use:
$("input[type='radio'][id*='$sector1Radio']")
This syntax will find any radio button whose id contains "$sector1Radio"
Once you have the element, you can check or uncheck it using the following code, which you'd call from the click event of your other element.
// check the radio button
$("input[type='radio'][id*='$sector1Radio']").attr('checked', true);
// uncheck the radio button
$("input[type='radio'][id*='$sector1Radio']").attr('checked', false);
One last thing... if you just want a block of text to click the button when pressed (wrap it in an tag and set the AssociatedControlId property to the control name of your radio button, like this...
<input type="radio" runat="server" id="sector1Radio" title="Sector1" />
<asp:label runat="server" id="lblsector1Radio" associatedControlID="sector1Radio">clicking here clicks and unclicks the radio button</asp:label>
I had the same problem. To use the jQuery UI to make your radiobuttons nice one has to write:
<div id="radio">
<input type="radio" id="radio1" runat="server" />
<label for="radio1">The label of the radio button</label>
...
</div>
<script type="text/javascript">
$('#radio').buttonset();
</script>
The id of the input tag must be correctly referenced by the label's for attribute. If the webpage is inside a master page then the id of the input tag will be modified to something like ctl00_Something_radio1, and suddenly the label's for attribute no longer references the input tag. Beware of this in ASP.NET!
i would like to know what exactly the difference between Html control
and asp.net web control. why do we need these two types of controls?
i have placed one html input text ,html button and asp.net text box AND ASP.NET BUTTON on my web page
<input id="Text1" type="text" />
<input id="Button2" type="button" value="button" />
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Button" />
when i take view source, both are rendered similarly
<input id="Text1" type="text" />
<input id="Button2" type="button" value="button" />
<input name="TextBox1" type="text" id="TextBox1" />
<input type="submit" name="Button1" value="Button" id="Button1" />
what is the advantage of web control over html control.
I got some links in the internet,but not clear what exactly
they are used for.
http://www.extremeexperts.com/Net/FAQ/DiffBetweenServerandHTMLControls.aspx.
Could any one please explain the difference between these two controls.
First, if you drag an Html control from the Toolbox onto your design surface as in your example, the tag created does not include runat="server". That means it is native Html tag and not a .NET control. A native Html tag without the runat="server" has no server-side functionality. Thus, you could not set the value of the your "Text1" input tag in the code-behind.
Second, once you add the runat="server" to your Html input tag, you convert it from a native Html tag into a HtmlControl which derives from System.Web.UI.Control. Now the question could morph into the differences between something that derives from System.Web.UI.Control and System.Web.UI.WebControl. However, to specifically address your question, let's compare a standard input type="text" control to the TextBox control:
TextBox control can be access from the code-behind where an input control cannot (not easily) which also means that you can wireup server-side events for a TextBox control whereas you cannot with a standard Html control.
A TextBox control automatically saves its value using ViewState.
A TextBox control can be skinned using a Theme and .skin file whereas a native Html control cannot.
A TextBox can render as either an input type="text" control or a textarea depending on its TextMode property.
A TextBox control can participate in validation using validators.
Last but not least, the TextBox control can use control adapters to render differently in different browsers if required. See http://msdn.microsoft.com/en-us/magazine/cc163543.aspx.
Now, all that said, if you do not need any of WebControl capabilities, then using an native Html control is substantially leaner. In your example, you simply dragged two empty controls onto your design surface. If that is all you needed then using the .NET control would be overkill. However, as you start adding AutoComplete and server-side events and such, the full content, Javascript and all, of what gets to the Browser is much larger.
In short HTML controls don't persist their state while Postbacks. On the other hand ASP.Net control provides you to luxury to have their state saved while several Postbacks automatically. Different while using ASP.Net control instead of HTML element is:
<input type="hidden" name="__VIEWSTATE" value="dDwtNTI0ODU5MDE1Ozs+.................." />
This hidden field is auto generated by ASP.Net and it contains all you controls state in value attribute.
The server controls have a runat="server" attribute which enables you to provide server-side logic for these controls in the code-behind. You can also add this attribute to existing HTML controls to gain this same functionality.
The HTML controls are simple controls that correspond directly to HTML elements.
The ASP.NET Web Controls abstract the HTML elements, and generally provide more control over styling (though some would call this a bad thing).