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I have this datalist in a user control i want when i keep mouse over "More", it should be invisible. it is working on .aspx page not on user control. How to do this. This control is placed on master page.
Please Help.
Probably it will be an issue with getElementById. In a naming container you cannot get the element by simply giving its id. You have to use ClientID to get the generated id of the element at runtime.
Something like
document.getElementById ( "<%= DataList2.ClientID %>");
See Control.ClientID Property
and
Control ID Naming in Content Pages
I would agree that it's probably an issue with trying to get the id of the element since the element's id changes at runtime when you put it inside a user control. You can run your code then do a view source in the browser and see exactly what the id is generating to at runtime.
Have you tried debugging the javascript mover() and mout() function? I am guessing you are looking for elements with the wrong id's since the id's are probably different inside a user control.
Related
I am facing issues when I tried to add same custom control twice in the same page. The issue is because instance of one control is caling the java script of the other. Added to that I am using ajax popup extender where in I have popup divs with in that control itself.
Now it is leading to java script errors because it is geting confused among the popup div ids and scripts etc.
Please help me.
Take one step further in taking care about client-side IDs generated uniquely for the tags inside each instance of your custom control.
This can be easily fixed by adding runat="server" attributes to the tags which you want to have unique client side IDs when rendered to the browser. Then you should use this kind of code in JS:
document.getElementById("<%= control.ClientID %>");
As about tags which you don't want to mark using runat attribute, you can assign them their IDs uniquely on the server-side manually in each instance of the custom control.
I hope this helps!
There's no automatic fix for this. If a custom control is going to be used more than once on a page, you have to design it to be aware of this. In particular, you'll probably need to refer to generated elements using their generated id:
var ele = document.getElementById("<%= serverSideControl.ClientID %>");
Javascript emitted by the control will have to also emit the appropriate ID's.
And so on.
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);
});
I am building a modal box as a custom server control and I want to have a property on the modal box TargetControlID that specifies the element that will show the modal when clicked. I've set the property up in the modal box and in the code behind I use the following code block (which I've tried in several different places
If (_targetControlId <> "") Then
Dim targetControl As WebControl = Me.Page.FindControl(_targetControlId)
targetControl.Attributes.Add("onclick", "test1();")
targetControl.Attributes.Add("onclick", "test2();")
End If
What happens is that targetControl always winds up to be NULL, and causes the page to crash when I tried to add attributes to it. I've double checked the spelling of the targetControlId and I am specifying a control that is runat="server". What is the proper way for a server control to access other controls on its containing page?
Thanks,
Mike
First of all, I should point out that the behavior you're looking for already exists in the ModalPopupExtender that comes with the free, open-source AjaxControlToolkit. I'd recommend you just use that. If you're still sure you want to write your own, then I'd recommend at least taking a look at their code to see how they go about it. ExtenderControlBase.FindControlHelper is a good place to start.
I've built a ascx control and I would like to be able to keep adding new instances of it using JavaScript instead of having to do a AJAX callback. Is this possible? I am basically building a web form for a query control and should clause X be filled in, I want to generate a control for the next clause below. I would like to learn how to do this without doing a callback.
Thanks
ASCX are server side user controls and, to my knowledge, can only be loaded by a server event. This can be accomplished through a full page postback or using UpdatePanels and ASP.net AJAX.
If you don't want to use these options and stick with a full JavaScript solution, you're looking at probably doing DOM manipulation and dynamically adding straight HTML.
If the ASCX controls don't change their appearance and all you're doing is showing and hiding them, one last alternative could be to load all of them into DIV tags that have their display style set to none. Then when the user clicks on a checkbox or whatever, you can use JavaScript to show that DIV tag containing the next control. This is how many JavaScript tab setups work.
I have asp.net form that contains fields. When I access this window, my javascript functions can access the fields via the DOM with the getElementById() method and when I postpack to the server I am receiving the updates made by the client.
However, when I launch the form as a child window using Telerik's RadWindow control, the javascript can not access the hidden fields on the child form. Instead I get null.
My questions are:
Are hidden fields on a child window
not accessible when the window is
launched from a parent asp.net form?
Has anyone attempted this with Telerik controls and run into issues?
EDIT
Craig pointed out that the id may be different. Two additional questions then:
Can you ensure that the id you assign at the server is actually used?
Is using getElementByName() a better mechanism to access DOM elements?
To get the ID of your asp.net control do something like this:
<%= theControl.ClientID %>
getElementByName is not as commonly used as getElementById. The ID attribute is supposed to be unique for each element on the page whereas the name attribute can be duplicated.
It is quite possible that the element's ID is not what you think it is. Check the rendered page and see if the ID is there. I am guessing that the page is given a different ID since it is rendered inside another control.
If that is the case, you can have the form render some script that returns the element ID by accessing the controls client ID.
David, I'm sending you this answer because I saw the same issue in my code, and the only REAL solution I found was that I had to support the "OnClick" function in two places... In my case, I was using PetersDatePackage, but it was on a Telerik RAD Strip.
In my case, the control was on a .ascx page, and the JS code was as follows:
function OnIncidentDateChange(ctrl, dtDate, bErr)
{
var weekday = new Array(7);
weekday[0] = "Sunday";
weekday[1] = "Monday";
weekday[2] = "Tuesday";
weekday[3] = "Wednesday";
weekday[4] = "Thursday";
weekday[5] = "Friday";
weekday[6] = "Saturday";
<%=LabelDayOfWeek.ClientID %>.innerText = weekday[dtDate.getDay()];
}
But, this itself was not enough. I had to add THIS code to my parent page. The page that holds the controls for the Telerik strip.
// Dummy function?
function OnIncidentDateChange()
{
}
Once I did that, it worked...
I'm not certain why, to tell you the truth, and it makes no sense to me, and may just be a issue with the PDP package...
I use getElementsByName for checkboxes within the same group.
As for the control's ID, TonyB has the right idea, but make sure you refer to the ClientID property in the PreRender event handler, because if you do it too early in the page life cycle, it will not be available yet).
Is it possible the that javascript is trying to get a reference to the hidden field before the RadWindow has loaded it? I believe I've run into this before and had to use setTimeout to get around the problem.