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.NET Forum / ASP.NET / General / December 2007Extended control issue
Hello, I got a problem when I try to extend a textbox. So I overwrite the Render method. For the stuff I try to do, I would like to add a custom attribute to my customized textbox. So it renders something like this: <input ... myattribute="value" /> I modify the value of "myattribute" using javascript, but when I submit my form, I can't get the value of "myattribute". Do I have to create create a class extended the attribute class? How do I have to proceed? Thank you in advance, Fabien. > Hello, > [quoted text clipped - 12 lines] > Thank you in advance, > Fabien. When you submit the form, each form element with a "name" attribute and a "value" attribute will be sent as a 'pair' or 'set' of name=value pairs. For example <input type="hidden" name="color" value="blue" /> this element will provide color=blue. HTH Thank you for your quick answer! I've already thought to use an hiddenfield. But I don't know how to get the value of this field in my extended control. I explain: when I submit my form, I call a method of my extended textbox and within this method, I would like to test the value of my hiddenfield. I prefer not to make that test in code behind of my page. Thanks in advance for your help. Fabien. >> Hello, >> [quoted text clipped - 18 lines] > element will provide color=blue. > HTH Hi, it's simple, find the HiddenField in page (you can get the current page instance by anyControl.Page), every control has a FindControl method (but it searches only his childs not childs of his childs.....) so if the hiddenField is somewhere deep, you will have use recursion to find the control. Then you will get it's value by yourHiddenField.Value Regards, Lukas Holota > Thank you for your quick answer! > I've already thought to use an hiddenfield. But I don't know how to get [quoted text clipped - 30 lines] >> element will provide color=blue. >> HTH Hello, Thank you but it doesn't work. I try in debug mode. In fact, I can find the value of my hiddenfield by using (this.Page.Request.Form.GetValues(base.ID + "_hidden"))[0], but the value is not the good one. The value is the orignal one (before any modification in javascript). I can't get the value modified by the javascript. I cannot use FindControl because at this time, the object is not yet "re-created" (after submit but before render). Regards and thank you again, Fabien. > Hi, > [quoted text clipped - 42 lines] >>> this element will provide color=blue. >>> HTH Hi, Fabien, You're almost there with the solution, but instead of using base.ID use this.ClientID. This way you'll make sure that the property is retrieved no matter where the control is placed. It's always dificult to create custom properties on the client side... One of the most terrifying aspects of it is the lack of __defineGetter__ and __defineSetter__ in the Internet Explorer, which I circunvent using behaviors (and __defineGetter__ and __defineSetter__ for Gecko) it's ugly but it works. So if you want your property to mork like, say, "value" you'll need to type some more code. ;) Let me know if you have questions Paulo Santos http://pjondevelopment.50webs.com > Hello, > [quoted text clipped - 63 lines] > > - Show quoted text - Hello, Thank you for your answer, but I'm not sure to understand the difference between base.Id and this.ClientID... Both of those strings will return the same value... I can get back the id or name of my hiddenfield, I can't get back the value of this item assigned client-side. Am I wrong? Regards, Fabien. Hi, Fabien, You're almost there with the solution, but instead of using base.ID use this.ClientID. This way you'll make sure that the property is retrieved no matter where the control is placed. It's always dificult to create custom properties on the client side... One of the most terrifying aspects of it is the lack of __defineGetter__ and __defineSetter__ in the Internet Explorer, which I circunvent using behaviors (and __defineGetter__ and __defineSetter__ for Gecko) it's ugly but it works. So if you want your property to mork like, say, "value" you'll need to type some more code. ;) Let me know if you have questions Paulo Santos http://pjondevelopment.50webs.com On Dec 26, 8:59 am, "Fabien Henriet" <fabien.henr...@nospam.be> wrote: > Hello, > [quoted text clipped - 69 lines] > > - Show quoted text - > Thank you for your answer, but I'm not sure to understand the difference > between base.Id and this.ClientID... Both of those strings will return > the same value... I can get back the id or name of my hiddenfield, I > can't get back the value of this item assigned client-side. Does this thread help? http://forums.asp.net/p/1039574/1444169.aspx  SignatureMark Rae ASP.NET MVP http://www.markrae.net Hi Mark, Yes and No. I explain. I render the hiddenfield this way: HiddenField hiddenField = new HiddenField(); hiddenField.ID = base.ID + "_hidden"; hiddenField.EnableViewState = true; hiddenField.Value = false.ToString(); hiddenField.RenderControl(writer); This is in my "protected override void Render(System.Web.UI.HtmlTextWriter writer)" method of my extended textbox. How to specify "runat=server"? During postback my value is the one I set in hiddenField.Value, not the one javascript set. Any idea? Thank in advance, Fabien. >> Thank you for your answer, but I'm not sure to understand the difference >> between base.Id and this.ClientID... Both of those strings will return [quoted text clipped - 3 lines] > Does this thread help? > http://forums.asp.net/p/1039574/1444169.aspx > I render the hiddenfield this way: Why? Have you tried simply to add the hidden field to your UserControl's markup just like any other control...? SignatureMark Rae ASP.NET MVP http://www.markrae.net Hello Mark, I try to create our own custom controls and I would like to make it the most generic you can have. We create a lot of controls to use in web pages. It's a kind of central project used in all our websites. Anyway, we thought a lot over that and the best way for us was to extend TextBox class and so on... So we took this way. I can't imagine you cannot add some attributes to an object. If I modify Text attribute, I can get its value, why can't I do that with another property? I heard about custom attributes. I defined my own attribute and try to use it in my class. I can change the value within javascript. But do you know how to get the value server-side? Can you give me a good tutorial with custom attributes and confirm me I can use them to solve my problem? Thank you in advance, Fabien. >> I render the hiddenfield this way: > > Why? Have you tried simply to add the hidden field to your UserControl's > markup just like any other control...? > Anyway, we thought a lot over that and the best way for us was to extend > TextBox class and so on... Why? > I can't imagine you cannot add some attributes to an object. You can... > If I modify Text attribute, I can get its value, why can't I do that with > another property? The Text attribute already exists for the TextBox control. I think the problem is that you are modifying the TextBox control far too late in the page lifecycle. Generally speaking, custom controls need to be created no later than Page_Init... > Can you give me a good tutorial with custom attributes and confirm me I > can use them to solve my problem? Create a UserControl which contains a TextBox and a HiddenField, and your problems will disappear... SignatureMark Rae ASP.NET MVP http://www.markrae.net Thank you for your kind help, I'll do that. Regards, Fabien. >> Anyway, we thought a lot over that and the best way for us was to extend >> TextBox class and so on... [quoted text clipped - 18 lines] > Create a UserControl which contains a TextBox and a HiddenField, and your > problems will disappear... Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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