Thank you. Microsoft makes no warranties, express or implied, with respect to the information provided here. The following examples show a Web user control that is inside a content page for a master page. The user control contains a DropDownList control and a Label control. The text that is displayed in the Label control is determined by the value that the user selects from the DropDownList control. The text value is set through client script so that the Web page does not have to post back to the server in order to set this value.
To get a reference to the HTML element that is rendered for the Label control in client script, you must know the value of the control's ClientID property. However, because the user control can be put anywhere in a Web page, it is impossible to know in advance which naming containers will contain the controls.
When the page renders, this is what the generated output looks like at at the bottom of the page. So, that's it. I hope you find this useful and if you know of any ways this control could be improved, please let me know. I don't like including any script tags into the HTML code of the page. However some controls are not included e. HiddenField controls. It throws a parser error with the message that the HiddenField control no RegClient property has.
And also html controls like iframe's are not included. Nice control : But this is not working with UpdatePanel. I'm actually trying to understand this line of code if typeof WebControl. IsAssignableFrom control. Net 4. In this article we will see each of them in detail. In the older version of ASP.
Net, the Framework modifies ClientId and until runtime, you do not know what the client-side id would be, this makes the client-side programming very difficult.
Also modifying the page for example, you add a master page or control inside user control can result in different client-side id generated. To handle this in the old version of ASP. Until ASP. Chirstavo - Using class selectors is a good idea but it requires some extra effort on your part to explicitly tag controls with the class name you want for an Id.
I suppose ASP. NET 4. Mark Kadlec October 15, Thanks for sharing! Stephen October 16, NET code put out ever David Carrillo October 16, Do you think is less efficient this method? Rick Strahl October 16, At some point I was going to implement something like this for the ScriptVariables control as well.
NET October 16, Speednet October 16, NET ClientIDs with jQuery There is one other way to do this, and either not many people know about it, or else nobody is talking about it. I posted this over at Chris Love's blog about a week ago, but it didn't generate much interest over there.
I think of the 'add anything to the document' approaches I think that a class is the cleanest way as it doesn't interfere with the document in any way. It leaves everything as it is and simply adds a class. Ultimately I prefer to not have to modify my layout in any way, just my code. Once ASP. Ultimately this is all preference. Interesting how many different ways people have dreamt up for this scenario of dealing with the damned naming containers.
Speednet October 17, There are trade-offs with every single approach, except the one coming in 4. However, the UPside to using my approach is that it's among the fastest -- certainly faster and more efficient that the CssClass method, in terms of raw performance. Personally, I use both approaches in my own code.
When using "hacky" solutions like all of these, it's important to use the best one given the situation. I'm not overly concerned about a small wrapper element, although I understand the concern, because they are used so often in other scenarios in the course of common HTML development, mainly to overcome CSS weaknesses, and they are also used extensively by the ASP. NET server controls in their normal output.
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