If you create a table and add it, the ClientID property in the code behind doesn't reflect the ID in the actual file, so document.getElementById doesn't work.
How can I add a control, and be able to access it using Javascript, with only its ID (such as 'table1')?
You will have to render the "ClientId" out to the browser and then grab that value to be able to use it via Javascript.
Starting with .NET 4.0, this will no longer be an issue as you can change the behavior of the iNamingContainer and the id structures.
You could set a javascript variable on the fly to your new table's ClientID and then use its value in getElementById.
Related
I'm dynamically creating controls and assigning the id.
When I parse through the request, the assigned key is there, but it is prefixed by all the controls the dynamically created control is created in.
How can I ensure that the request[key] is the same as the id I assigned?
for example
request["mykey"]
instead of
request["ctl01$ctl02$mykey"]
request.form uses client side names not ids.
the ids were correctly set using clientidmode='static'
there is currently no way of assigning the name to asp.net web controls.
i think i could get this to work using html controls with runat=server, but i've decided to just use the ugly keys to parse my request.form.
Does the ASP.NET ClientServerManager provide some method or property to return the name of an ASP.NET control in the generated html page that could be used to write the javascript (using RegisterClientScriptBlock) in the code-behind? The actual generated control names can be quite long and unknown (I am also using master pages). I would like a generic way to write the javascript text and have the actual names of the controls be added to the javascript string. I would expect some method that I pass in the name of the control and it returns the actual html control name. I have searched in the documentation of the ClientServerManager and could not find anything.
Control.ClientID is rendered as html tag ID, so you can use that property.
If you are worried about control names, check out ClientIdMode where you can specify this and make it much simpler.
http://msdn.microsoft.com/en-us/library/system.web.ui.control.clientidmode.aspx
Would this help your issue?
I am creating a web user control for a simple poll. I am currently registering it on the page and then referencing it via tagprefix.
The form for the poll is in basic html (no server controls) and is in the front-end of the web control. How can I change the look of the user control depending on the settings passed into it? Is this possible without using server controls?
Update
Can I change the html layout of a user control? If so could someone post some examples. Please note I do not use asp.net form controls, so none of that please :)
You might be able to also use jQuery to replace existing css setting in your code. Create properties on for your user control, and then pass settings in the classes. Then use jQuery to replace them. This however requires jQuery to be linked to your page (or within your control) and you'd have to write the CSS classes out to the jQuery code (using server controls, but you could use the literal control so there's no excess code).
Personally I'd go with the option of using server controls instead of straight up HTML, you'd get alot more flexibility, and then passing through the settings would be pretty straightforward, put something like this in your controls backend code:
Private _TextBoxCssClass As String
Public Property TextBoxCssClass() As String
Get
Return _TextBoxCssClass
End Get
Set(ByVal value As String)
_TextBoxCssClass = value
txtBox1.CssClass = value
txtBox2.CssClass = value
End Set
End Property
You most likely want to have a property or event in the control that changes the css. It may end up best to add some server controls or javascript / jquery to make it easier.
If its only the styles you want to change, then you can expose a property to set the style attribuites of the respective control inside your User Control. If you want to control the whole HTML layout of the control then Custom Control is the viable option.
I have a page that's derived from a master page. On this page, I have a hiddenfield ("hfUser"). How can I access this "hfUser" control and get/set its value using JQuery?
I've tried variants of this:
$(document).ready(function() {
var test = $("#hfUser").val();
alert(test);
});
but test = undefined. I'm guessing I've got the selector wrong, but I don't know how to get an asp hiddenfield. Any ideas?
Thanks
If you are using Asp.net controls, the server will mangle the control ids. It adds a bunch of extraneous control tree hierarchy information into the id. You need to reference what that acutal id is that's getting rendered, which is availble with the ClientID property on the control (hfUser.ClientID) or access your control in a different, more roundabout way, like find the controls parent, then search through its children to find your control.
If you don't have to use the asp.net HiddenField control, try just using a regular old html input.
ASP does like to mangle ID's. The further down the rabbit hole (or nesting controls) you go, the more ASP adds to your control ID. Throw in Master Pages, and it's yet another level or two.
Another way to access server-side controls (with the runat property set), is to use the square brackets in your jQuery selector.
Like this:
$("[id$='hidImgSource']").val()
That selects any elements whose ID has 'hidImgSource' as ending part of the name. So it will find mangled ID's.
Here is a link to the jQuery Selectors page that explains some more options.
If the hidden field is an ASP.NET control, check out this blog post to help you with jQuery selectors for ASP.NET controls
http://www.foliotek.com/devblog/extending-jquery-to-select-asp-controls/
Do it like this:
$(document).ready(function()
{
var test = $("**#<%= hfUser.ClientID %>**").val();
alert(test);
});
This I can't work out
I have ASP.Net user control,which is basically two drop downs, that has a public property Index which is calculated from the drop downs, and works fine
I need to access the value of 'Index' from javascript, but accessing via getElementById was completely wrong, can anybody point me in a better direction
Cheers
The property you're talking about is a server side thing and has no presence in Javascript. Basically, whatever ASP.NET does on the server will generate a single HTML page containing a bunch of HTML tags. The browser is not aware of the user control being a single entity at all.
You should calculate the property on the client by looking up the ID of the drop down directly in Javascript. You can do find out the client ID of the drop down by getting its ClientID property.
Create javascript method as a string from server side and use index property to create script string.
register string on which event it is required.
you can take help from following link to register javascript:
http://msdn.microsoft.com/en-us/library/aa479011.aspx
If any server side control is used in javascript method, use ClientID property as ID of the control.
Hope, It helps