something that cannot happen

source.Read(read => If the widget is not bound (e.g. .Name("DealerBoothDropDown") Now enhanced with: New to Telerik UI for Blazor? To bind the DropDownList to a model: Populate its Data parameter with the collection of items you want in the dropdown. The example below demonstrates how to achieve that. The value will not be set if there is no item with such value. CONSOLE LOG Clear log Support & Learning Resources DropDownList Documentation Overview DropDownList Forums The user input is restricted within the predefined options. Hmm well that is what the DropDownStyle is set to and the NullText works greatuntil you bind any data to the list. DropDownList Documentation Overview; DropDownList Forums; Knowledge Base Set the TextField and ValueField parameters to point to the corresponding property names of the model. .DataTextField("DropDownText") i am binding the kendo gridview using model value. This is mandatory when binding RadDropDownList at runtime. async Task OnBrandChanged(int brandId) I'm looking for this behaviour. But after this the descendant dropdown calls eventchanged callback with 0 (default) value and dropdown shows the text passed in defaulttext parameter. Progress is the leading provider of application development and digital experience technologies. Please try to stay close to the main topic of the thread using business tone of language only. Set the DefaultText = " ". I am not exactly sure what is the problem with strongly-typed extension, but you can check here. You can find the original item here: (Total attached files size should be smaller than, Progress Telerik UI for Blazor Feedback Portal, Selection should not reset value on data change, https://feedback.telerik.com/blazor/1471160-selection-should-not-reset-value-on-data-change. The fact is, a dropdown list is a dropdown list no matter where it is, winforms, web etc. Supported file types: PNG, JPG, JPEG, ZIP, RAR, TXT. You can modify the default text to be shown only before an item is selected by toggling the DefaultText parameter value depending on your business logic. By default, RadDataSource causes RadListControl and RadDropDownList to select the first item, e.g. In this demo you can see the Tag Helper example and specified data text and value fields, virtualization, templates and filtering with specified minimum length option. I suppose you would expect the Value to remain the same so you can deal with the rest? But hey, that's just my opinion and asyou saywe are all entitled to our own opinions. And parent changes again, if the updated datasource does not contain the previous dependent value the dropdownlist sets its value to default. In my case it is not acceptable because I want to set a specific value (in this example the default color), not the first and not the default. After the parent dropdown has changed, in its event handler I reload the dependent data source and set a new valid value. I saw that it displays some value in a element that I don't know how to change. Your sample was helpful and is one of the test cases for this scenario. Setting the DefaultText = "" (empty string) doesn't change the selection. I have Created Kendo Gridview with Dropdownlist inside it is not displaying the selected value while binding the gridview. It's like changing the value of a vote without changing the vote him self or the name on the vote. When the page loads, I would like to execute some JS that sets a default value in the Dropdown. Why don't you show me an application anywhere in which a user is required to select a value from a drop-down list that does NOT have a default option. API. This approach applies to all inputs Here are a few examples in their corresponding tabs per component: Care to elaborate on that since it is easily done with the ASP.NET Ajax controls and is contained in virtually every drop down list you find anywhere (winforms and web). E.g. I want the DropDownList to show the default text only when no option is selected. Some requirements may call for some sort of placeholder string indicating what the DropDownList component is for, which is where the default item feature comes in. Download free 30-day trial. Hello Team, I have Created Kendo Gridview with Dropdownlist inside it is not displaying the selected value while binding the gridview. once the user selects a value, they are not allowed to select 'null' again. }) .Events(e => { in model values is available but it is not displaying the selected value and once after changing the dropdown value it is reflecting ID Value in another label where i bind IDtext. The demo shows a sample scenario for using the Telerik DropDownList for ASP.NET Core where you can bind the component to a list of values and make a selection from the available options. All Rights Reserved. Due to the remote binding, the dataBound event is the appropriate event to use in your case. Set the Value property to the intial value of the component (optional). Telerik UI for ASP.NET MVC . This doesn't break anything for anyone else. Please remove the hardcoded width and make default width 100% as in the other components.---ADMIN EDIT. Supported file types: PNG, JPG, JPEG, ZIP, RAR, TXT. Virtual Classroom, the free self-paced technical training that gets you up to speed with Telerik and Kendo UI products quickly just got a fresh new look + new and improved content including a brand new Blazor course! Telerik and Kendo UI are part of Progress product portfolio. DropDownList /. Please refer to the attached project and to the attached movie. DropdownList sets the value to default after the bound data has been updated I have two cascaded dropdownlists, in attached example car brands and selectable colors. Are you really thanking me? Two ways to accomplish: 1. myDdlData will have items for the First, Second and Third but not for the Unknown. Try now. In other words if the autoBind option is set to false, then the widget will not be bound and thus will not show the selected text. Product Bundles. The default browser behavior of Chrome and Edge is to return the selection in pixels. Telerik and Kendo . Download free 30-day trial. The best way to do this would be exactly how it is done in the web. This feedback drives me to try setting value to default and wait for re-render the descendant dropdownlist before set the wanted value. Copyright 2022 Progress Software Corporation and/or its subsidiaries or affiliates. So not sure what people are saying about the "NullText" property but it seems to be useless if you are actuallybinding anydata to the control. value, the dropdownlist calls the valuechanged callback with default value. Just for the record, setting "NullText" on a DropDownList in which you bind a dataset/table to does not work. If so, please click the Follow button on the original request for that: https://feedback.telerik.com/blazor/1471160-selection-should-not-reset-value-on-data-change. I updated the title to be more generic - it should be about removing the inline width rule, and whether there will be a default value and what units it will use will be up to a more detailed research.--- It provides flexible data binding, virtualization, cascading lists, appearance customization through templates, events, validation, accessibility, RTL support and keyboard navigation. The text you enter is not an option in the list (Please select an option)and the first item in the dataset is the first item in the list, which brings us back to having to add a record to the dataset at some point in order to accomplish this functionality that should be intrinsic. So I am obviously not aware of this "Null Text" but I will look into it because adding a value to a datasource IS dumb, but seemed to be theeasiestway. Do you want to know when a feature you care about is added or when a bug fixed? In order to achieve your goal you can either set the AutoBind(true), which is the default value, or set the text and value of the widget. If the data source does not contain the previous (!) Am I missing something? The data source must be removed first. #1 PassiveAggressive- look it up dude. See Trademarks for appropriate markings. http://demos.telerik.com/aspnet-mvc/dropdownlist/remotedatasource, Try our brand new, jQuery-free Angular 2 components. But when you change the brand to another item, it loads the available colors, set value to brand's default color (in example McLaren default color is Yellow, Id:4). In the feedback I mentioned in my bugreport it gave me a workaround: set a descendant dropdown value to default(TValue) (0 in this case), delay for a short while until dropdown re-renders. Thank you for your understanding. I did see a reference to this earlier in the topic so I tried it.it didn't work. With the MVVM patter used by the framework, you do not need methods like Clear () to remove selection - when the Value matches the default value for its type, the Telerik component will show the placeholder automatically (if one is set). The ONLY reason you have to mess with the underlying data in winforms is because you are not able to add the item programatically AND bind the list (in a smart way). @James: a part of your comments was deleted due to the use of offensive language. If you are able to have a "Select Option" or whatever as the first item in the list so that you can validate that a user actually made a selection, that's all I am talking about. DataSourceID property - set to the ID of your data source. New to Telerik UI for ASP.NET MVC? Me.RadDropDownList1.Items.Add (item) Next Dim defaultItem As New RadListDataItem () defaultItem.Text = "Select a value" defaultItem.Value = 0 Me.RadDropDownList1.Items.Insert (0, defaultItem) Me.RadDropDownList1.SelectedIndex = 0 End Sub End Class Public Class Car Private m_Name As String Private m_Id As Integer Telerik WebForms DropDownList DropDownList in RadGird. All Telerik .NET tools and Kendo UI JavaScript components in one package. Hey as long as the option is in the list I could care less where it comes from or what it is. API. The following properties and methods are used when binding RadDropDownList to a data source: DataSource property - set to an instance of your data source. There are few important steps: A defaultItem has to be set. I am testing with the current latest (2.21.1 at the time of writing) which has the fix for the other issue you linked as well. The component simply cannot know what it should do in this case, whatever it does is wrong in some cases, which is why we must leave it to the app. DropDownList does not select the first Value in its data source Before, the Value from the first item in the Data was populated through @bind-Value to the view model. If the widget is not bound then you will not be able to see the selected text. Copyright 2022 Progress Software Corporation and/or its subsidiaries or affiliates. Wednesday, February 25, 2009 12:25 AM 0 Sign in to vote User401360897 posted You need After Data Bound Event, Use Insert Method. To display a selected item when the component renders - provide the Value of the desired element. All Rights Reserved. You can modify the default text to be shown only before an item is selected by toggling the DefaultText parameter value depending on your business logic. Just wanted to throw my two cents in. I'll take a look at your example though and give it another shot. ) All Telerik .NET tools and Kendo UI JavaScript components in one package. As you are using remote binding, I will use this demo as a starting point:http://demos.telerik.com/aspnet-mvc/dropdownlist/remotedatasource. Could you please help me to implement this concept. .HtmlAttributes(new { style = "width:500px" }) function onChange (e) {. Data.ColorId = default; Progress, Telerik, and certain product names used herein are trademarks or registered trademarks of Progress Software Corporation and/or one of its subsidiaries or affiliates in the U.S. and/or other countries. . FilteredColorList = GetFilteredColorList(brandId); Now enhanced with: The MVC wrapper for Kendo DropDownList widget, renders input element with the selected value. Marin Bratanov .DataValueField("BoothDetailRowId") By default, if no Value is provided and no DefaultText is defined, the DropDownList will appear empty. DropDownList Methods value value Gets or sets the value of the DropDownList. Excellent, thank you! .AutoBind(false) The reason we do not provide placeholder for the DropDownList is that according to UI concepts a placeholder should exist on inputs only. Can you show me how I might do this. See blog below. Direct offensive language as well as sarcasm and irony are not tolerated. All Telerik .NET tools and Kendo UI JavaScript components in one package. In order to achieve your goal you can either set the AutoBind (true), which is the default value, or set the text and value of the widget. I think what you are doing in the attached file is the correct approach and I cannot see issues in its behavior - when I change the car brand I see the default text as I would expect since there is no matching item in the datasource and the app code has taken care of setting that. in model values is available but it is not displaying the selected value and once after changing the dropdown value it is reflecting ID Value in another label where i bind IDtext. It no longer is. Please try to keep your comments close to the main topic of the thread, and if you have comments concerning a specific answer of somebody else, as I mentioned above, keep close to the business tone of language and express your feedback in a constructive way. DropDownList /. 2. myDdlData will have item for Unknown, First, Second and Third. All I am saying is that it is NOT bad design to have a default option and that it IS bad design to NOT have a default option. Events configuration: .Events (ev => ev.Change("onChange")) Event handler: <script>. Ummmyes I am well aware of the many differences between windows forms and web, but thanks! Max total file size - 20MB. If the widget is not bound then you will not be able to see the selected text. When I do not pass defaulttext parameter, the dependent dropdown selects the first element from the updated datasource. See Trademarks for appropriate markings. Copyright 2022 Progress Software Corporation and/or its subsidiaries or affiliates. All Rights Reserved. This is mandatory when binding RadDropDownList declaratively. See Trademarks for appropriate markings. Well then your method that returns the datasource should have a parameter called "IncludeDefaultOption" or something like that, or you could have seperate methods entirely or you can add it AFTER the method returns the actual data. Is there any way to avoid this behaviour of the dropdownlist? Can you show me an examplewhere you are bindinga dataset/datatable to the dropdownlist and also have a default "Please make a selection" item in the list (without adding it to the underlying dataset somehow)? Learn more about DropDownList for ASP.NET AJAX and get a free trial today. It would be perfect if I change the datasource of the second dropdown and set a value from the fresh dataset, the dropdown should not call the eventchanged callback with 0 or null value but shows the appropriate value (and its text) I have set. Download free 30-day trial. Progress, Telerik, Ipswitch, Chef, Kemp, Flowmon and certain product names used herein are trademarks or registered trademarks of Progress Software Corporation and/or one of its subsidiaries or affiliates in the U.S. and/or other countries. E.g. The DropDownList on the other hand resembles a <select> tag in HTML and <select . I have two cascaded dropdownlists, in attached example car brands and selectable colors. All Rights Reserved. In the following snippet, I expect to see "1" in the initial load of the page, but I see "0" - the default value for the integer. { New to Kendo UI for jQuery? e.Select("onSelect"); }. .Filter("contains") I just took issue with someone from Telerikbasically saying that having a "Select Option" is against best practices and UI design, that is not the case IMO. To check Waldo in the drop down list : ddlGivenAnswer.FindItemByValue ( DataBinder.Eval (e.Item.DataItem, "givenAnswer").ToString () ).Selected = true; After the parent dropdown has changed, in its event handler I reload the dependent data source and set a new valid value. If you comment these two lines I hope you will experience the issue. Now enhanced with: Dim _user As IQueryable(Of User) = uBl.GetAllUsersByCompany(_project.Company.CompanyID), Dim RadListDataItem1 As RadListDataItem = New RadListDataItem(). Max total file size - 20MB. autoBind is set to false ), the value method will pre-fetch the data before continuing with the value setting. Progress, Telerik, Ipswitch, Chef, Kemp, Flowmon and certain product names used herein are trademarks or registered trademarks of Progress Software Corporation and/or one of its subsidiaries or affiliates in the U.S. and/or other countries. Progress Telerik. Default Message property of the RadDropDownList enables the ability to set control's text if no item is selected. Progress is the leading provider of application development and digital experience technologies. DevCraft. Handling values that are out of the range of the available data is something that the application must handle, and the DefaultText could mask that to an extent, but it is still something that the app must take care of (more here). Do you want to have your say when we set our development plans? read.Action("GetDealersBoothsForDropDown", "DealerAccounting"); See Trademarks for appropriate markings. Solution. If you can, it is a poorly designed app. The article shows how to change this and display point value in the real font sizes dropdown header - RadEditor for ASP.NET AJAX Find other useful information in the Knowledgebase section of the ASP.NET AJAX documentation. Then, use the DataSource API to get the desired item (the one that should be selected by default) and use the value method to select it. If value is undefined, text of the data item is used. Support & Learning Resources. I will begin with what I perceive as the outstanding issue - the ValueChanged handler firing with the default value - what would you expect that the dropdown would do when its Data collection does not hold an item that matches the Value? In the Select event the DropDownList has not yet changed the value from the previous to the new one, that is why the Change event should be used to get the new value: . To display DefaultText - Value should be 0 or null depending on the data type you are using in the ValueField and the DefaultText should be defined. My question is how to set the default value of a DropDownList? Data.ColorId = GetDefaultColor(brandId); Copyright 2022 Progress Software Corporation and/or its subsidiaries or affiliates. All Rights Reserved. and it is NOT against UI standards and best practicesto have a default item such as "Select A Value" as the first item in the list. Please Follow that page for status updates, I am marking this one as a duplicate to keep the portal tidy and reduce confusion in the future. When I use DropDownListFor(x => x.UserName) I want my default value to be what I have in the Model. default Configurator Configuration Set data-value-primitive Enable Visible Information Kendo UI DropDownList supports the enabled , events , source , value and visible bindings. In order to utilize the Virtual Scroll Rendering the DropDownHeight property must be set. Okay, manually setting the selectedindex to -1 seems to do the trick so that definitely fills the need. Now enhanced with: @(Html.Kendo().DropDownListFor(m => m) Default Theme Main; Main Dark; Nordic; Ocean Blue; Purple; Turquoise; . What you want is to check the rigth item. The dependent dropdown has defaulttext option. Is the behavior described in the first paragraph what you are looking for? { itemDisabled has to be set to return the value of the defaultItem. Components /. Vote for the 7 Telerik products at the 2011 Great Indian Developer Awards. Default Item By Default, the KendoReact DropDownList will render an empty area if no value has been displayed. Regards, .DataSource(source => DropDownList should clear selection when bind value is set to null (or the default) and no default value is set The following knowledge base article describes how to select the default value in a drop down, but if there's no default value the selection is not cleared using this method. The Default Message property could be very useful, when one needs to provide more information about the content of the RadDropDownList. Once again, not talking about how it is implemented I'm just talking about simply having a default item which is what the original response seemed to be saying was a bad idea. }) You have to bear in the mind that you can see Null text only in case that the control is not in focus (this is a desired behavior). Progress is the leading provider of application development and digital experience technologies. When using the control in data bound mode you should not manipulate, http://www.wiseowl.co.uk/blog/s110/set-first-item-list-control.htm. Demo page for the DropDownList HtmlHelper }) Q312 of RadControls for WinForms is available for. .ServerFiltering(true); // Let's do server side filtering So if you are telling me that you can bind a dataset to the RadDropDownList AND have the NullText property work (by displaying what is in the NullText property as the selected item when the form initially loads) then I would have to disagree - or at least say that it sure does not work that way in my app. All Telerik .NET tools and Kendo UI JavaScript components in one package. Lol, yes this is the point I have been trying to make since my original post on here. i am binding the kendo gridview using model value. once the user selects a value, they are not allowed to select 'null' again. DropdownList sets the value to default after the bound data has been updated. NOT having a default "Select Option" is against best practice and UI designin my opinion - how you get it there is up to you and yes some of the ways you may choose to do this may not be the best. The current demo of the UI for ASP.NET Core DropDownList demonstrates an implementation of the most common scenarios in which the component is used. Supported file types: PNG, JPG, JPEG, ZIP, RAR, TXT. You can change the underlying data source for your control by using an SQL union query. Thanks! I want the DropDownList to show the default text only when no option is selected. Max total file size - 20MB. Adding a default value to a drop-down list goes against best practices & UI standards? Have an OnDataBound event for the dropdown and add the item in code there - no messing with the underlying data. Progress, Telerik, Ipswitch, Chef, Kemp, Flowmon and certain product names used herein are trademarks or registered trademarks of Progress Software Corporation and/or one of its subsidiaries or affiliates in the U.S. and/or other countries. Just add a default value in your dropdown like --Select-- Now make the AppendDataBoundItems property of Dropdown to "True" Thats it. RadListControl can not transition directly from bound to unbound mode. That is a ridiculous statement in my humble opinion since having a Default (NOT Null) value only enhances usability and actually makes the control able to be validated (otherwise the user can just leave the first item selected and you can't validate that they actually made a selection vs. forgetting and leaving the 1st item selected). Dont go for server side code unless you have a client side simple code. Telerik and Kendo UI are part of Progress product portfolio. This is a migrated thread and some comments may be shown as answers. Components /. Progress, Telerik, Ipswitch, Chef, Kemp, Flowmon and certain product names used herein are trademarks or registered trademarks of Progress Software Corporation and/or one of its subsidiaries or affiliates in the U.S. and/or other countries. Indeed, the ValueChanged event should not fire like that and we've reviewed this case too - the issue (and solution) are the same as here: https://feedback.telerik.com/blazor/1471160-selection-should-not-reset-value-on-data-change. You should manually set SelectedIndex to -1 after the form is loadedif you want to remove the selection and see the Null Text. In the example at a first run everything's fine. See Trademarks for appropriate markings. In next round when dependent dropdown holds the default value, after reloading datasource it works as expected. 'Chai' data-value-primitive is not set. Take a look at this ASP.NET MVC DropDownList example to find out how events are triggered in the drop down listcontrol. await Task.Delay(5); Data.BrandId = brandId; Thanks! Note the single blank space. This item is a duplicate of an already existing item. The original response from Telerik was unclear and basically told the guy that it is stupid to put a default option in the list - he didn't specify that it was only the way he was doing it thatwas incorrect.
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