Data.ColorId = default; 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. I'll take a look at your example though and give it another shot. once the user selects a value, they are not allowed to select 'null' again. I'm looking for this behaviour. All Telerik .NET tools and Kendo UI JavaScript components in one package. Default Item By Default, the KendoReact DropDownList will render an empty area if no value has been displayed. 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 Set the TextField and ValueField parameters to point to the corresponding property names of the model. The Telerik UI DropDownList TagHelper and HtmlHelper for ASP.NET Core are server-side wrappers for the Kendo UI DropDownList widget. Hmm well that is what the DropDownStyle is set to and the NullText works greatuntil you bind any data to the list. Solution. The Default Message property could be very useful, when one needs to provide more information about the content of the RadDropDownList. All Telerik .NET tools and Kendo UI JavaScript components in one package. FilteredColorList = GetFilteredColorList(brandId); I suppose you would expect the Value to remain the same so you can deal with the rest? 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). .HtmlAttributes(new { style = "width:500px" }) Due to the remote binding, the dataBound event is the appropriate event to use in your case. .Name("DealerBoothDropDown") Telerik and Kendo UI are part of Progress product portfolio. Q312 of RadControls for WinForms is available for. Try now. Excellent, thank you! CONSOLE LOG Clear log Support & Learning Resources DropDownList Documentation Overview DropDownList Forums As you are using remote binding, I will use this demo as a starting point:http://demos.telerik.com/aspnet-mvc/dropdownlist/remotedatasource. Please remove the hardcoded width and make default width 100% as in the other components.---ADMIN EDIT. All Rights Reserved. DataSourceID property - set to the ID of your data source. Hey as long as the option is in the list I could care less where it comes from or what it is. Are you really thanking me? Thanks! If the data source does not contain the previous (!) Telerik and Kendo UI are part of Progress product portfolio. { If the widget is not bound then you will not be able to see the selected text. Am I missing something? This item is a duplicate of an already existing item. The value will not be set if there is no item with such value. But after this the descendant dropdown calls eventchanged callback with 0 (default) value and dropdown shows the text passed in defaulttext parameter. If value is undefined, text of the data item is used. 2. myDdlData will have item for Unknown, First, Second and Third.
. 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). By default, if no Value is provided and no DefaultText is defined, the DropDownList will appear empty. If the widget is not bound then you will not be able to see the selected text. I am not exactly sure what is the problem with strongly-typed extension, but you can check here. Max total file size - 20MB. The data source must be removed first. 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 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. 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. 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. .DataSource(source => Thank you for your understanding. You should manually set SelectedIndex to -1 after the form is loadedif you want to remove the selection and see the Null Text. I have Created Kendo Gridview with Dropdownlist inside it is not displaying the selected value while binding the gridview. 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). See Trademarks for appropriate markings. once the user selects a value, they are not allowed to select 'null' again. Telerik UI for ASP.NET MVC . 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. Copyright 2022 Progress Software Corporation and/or its subsidiaries or affiliates. autoBind is set to false ), the value method will pre-fetch the data before continuing with the value setting. Set the Value property to the intial value of the component (optional). The best way to do this would be exactly how it is done in the web. 'Chai' data-value-primitive is not set. In the example at a first run everything's fine. Description The UI for ASP.NET Core DropDownList comes with two options for implementation - HTML and Tag Helpers. Copyright 2022 Progress Software Corporation and/or its subsidiaries or affiliates. Marin Bratanov The dependent dropdown has defaulttext option. 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. RadListControl can not transition directly from bound to unbound mode. 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 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. 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. Please try to stay close to the main topic of the thread using business tone of language only. Do you want to have your say when we set our development plans? function onChange (e) {. 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. It no longer is. 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. All Rights Reserved. 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. 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. My question is how to set the default value of a DropDownList? 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. 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. source.Read(read => All Telerik .NET tools and Kendo UI JavaScript components in one package. i am binding the kendo gridview using model value. .DataValueField("BoothDetailRowId") 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. All Rights Reserved. { Progress Telerik. Download free 30-day trial. Now enhanced with: New to Telerik UI for Blazor? In next round when dependent dropdown holds the default value, after reloading datasource it works as expected. If the widget is not bound (e.g. Setting the DefaultText = "" (empty string) doesn't change the selection. it sets thecurrent position to 0 and this is a desired behavior. Lol, yes this is the point I have been trying to make since my original post on here. DevCraft. Ummmyes I am well aware of the many differences between windows forms and web, but thanks! Thanks! Okay, manually setting the selectedindex to -1 seems to do the trick so that definitely fills the need. Supported file types: PNG, JPG, JPEG, ZIP, RAR, TXT. 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. await Task.Delay(5); Data.BrandId = brandId; 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! Max total file size - 20MB. Check it out athttps://learn.telerik.com/. 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. When I do not pass defaulttext parameter, the dependent dropdown selects the first element from the updated datasource. To display a selected item when the component renders - provide the Value of the desired element. See blog below. API. Just for the record, setting "NullText" on a DropDownList in which you bind a dataset/table to does not work. Dont go for server side code unless you have a client side simple code. 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). 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 challenge telerik to justify their "it's not a bug because people rely on this behaviour" claim by describing just one plausible scenario where: 1) there's a non-primitive value & source type with an id and a label property 2) there's a data-bind value binding 3) there's a value field and text field defined 4) the desired behaviour would be to Support & Learning Resources. By default, RadDataSource causes RadListControl and RadDropDownList to select the first item, e.g. Progress is the leading provider of application development and digital experience technologies. Why the DropDownList .Value() method changes the value of the element, but not displaying it. Note the single blank space. }) . See Trademarks for appropriate markings. See Trademarks for appropriate markings. Have an OnDataBound event for the dropdown and add the item in code there - no messing with the underlying data. 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. { Telerik WebForms DropDownList DropDownList in RadGird. See Trademarks for appropriate markings. This is a migrated thread and some comments may be shown as answers. Is there any way to avoid this behaviour of the dropdownlist? Progress is the leading provider of application development and digital experience technologies. 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. See Trademarks for appropriate markings. #1 PassiveAggressive- look it up dude. 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. This is mandatory when binding RadDropDownList at runtime. What you want is to check the rigth item. I did see a reference to this earlier in the topic so I tried it.it didn't work. Explore the. 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. It provides flexible data binding, virtualization, cascading lists, appearance customization through templates, events, validation, accessibility, RTL support and keyboard navigation. Now enhanced with: @(Html.Kendo().DropDownListFor(m => m) The following properties and methods are used when binding RadDropDownList to a data source: DataSource property - set to an instance of your data source. Your sample was helpful and is one of the test cases for this scenario. The DropDownList on the other hand resembles a <select> tag in HTML and <select . 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. 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. 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. Can you show me how I might do this. e.Select("onSelect"); In order to utilize the Virtual Scroll Rendering the DropDownHeight property must be set. Product Bundles. 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. I saw that it displays some value in a element that I don't know how to change. .OptionLabel("Select Dealer and Booth") 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). And parent changes again, if the updated datasource does not contain the previous dependent value the dropdownlist sets its value to default. When the page loads, I would like to execute some JS that sets a default value in the Dropdown. Copyright 2022 Progress Software Corporation and/or its subsidiaries or affiliates. E.g. This is a migrated thread and some comments may be shown as answers. .Events(e => { Take a look at this ASP.NET MVC DropDownList example to find out how events are triggered in the drop down listcontrol. DropDownList Documentation Overview; DropDownList Forums; Knowledge Base Events configuration: .Events (ev => ev.Change("onChange")) Event handler: <script>. Telerik and Kendo UI are part of Progress product portfolio. Max total file size - 20MB. When I use DropDownListFor(x => x.UserName) I want my default value to be what I have in the Model. After the parent dropdown has changed, in its event handler I reload the dependent data source and set a new valid value. New to Telerik UI for ASP.NET MVC? 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. If you can, it is a poorly designed app. There are few important steps: A defaultItem has to be set. To check Waldo in the drop down list : ddlGivenAnswer.FindItemByValue ( DataBinder.Eval (e.Item.DataItem, "givenAnswer").ToString () ).Selected = true; read.Action("GetDealersBoothsForDropDown", "DealerAccounting"); 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). .ServerFiltering(true); // Let's do server side filtering 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. alert (e.sender.value ()); 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? 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. I want the DropDownList to show the default text only when no option is selected. 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. Support & Learning Resources If you comment these two lines I hope you will experience the issue. The reason we do not provide placeholder for the DropDownList is that according to UI concepts a placeholder should exist on inputs only. Adding a default value to a drop-down list goes against best practices & UI standards? itemDisabled has to be set to return the value of the defaultItem. Supported file types: PNG, JPG, JPEG, ZIP, RAR, TXT. Components /. But hey, that's just my opinion and asyou saywe are all entitled to our own opinions. Direct offensive language as well as sarcasm and irony are not tolerated. All Rights Reserved. This feedback drives me to try setting value to default and wait for re-render the descendant dropdownlist before set the wanted value. Now enhanced with: The MVC wrapper for Kendo DropDownList widget, renders input element with the selected value. 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, 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. .AutoBind(false) 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. }) default Configurator Configuration Set data-value-primitive Enable Visible Information Kendo UI DropDownList supports the enabled , events , source , value and visible bindings. 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. The DropDownList displays a list of values and allows for a single selection from the list. }. The default browser behavior of Chrome and Edge is to return the selection in pixels. Progress is the leading provider of application development and digital experience technologies. Is the behavior described in the first paragraph what you are looking for? @James: a part of your comments was deleted due to the use of offensive language. DropdownList sets the value to default after the bound data has been updated. Two ways to accomplish: 1. myDdlData will have items for the First, Second and Third but not for the Unknown. The user input is restricted within the predefined options. After the parent dropdown has changed, in its event handler I reload the dependent data source and set a new valid value. Set the DefaultText = " ". 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. Data.ColorId = GetDefaultColor(brandId); Default Theme Main; Main Dark; Nordic; Ocean Blue; Purple; Turquoise; . Telerik and Kendo UI are part of Progress product portfolio. DropDownList /. API. Copyright 2022 Progress Software Corporation and/or its subsidiaries or affiliates. Demo page for the DropDownList HtmlHelper Now enhanced with: Dim _user As IQueryable(Of User) = uBl.GetAllUsersByCompany(_project.Company.CompanyID), Dim RadListDataItem1 As RadListDataItem = New RadListDataItem(). Download free 30-day trial. Wednesday, February 25, 2009 12:25 AM 0 Sign in to vote User401360897 posted You need After Data Bound Event, Use Insert Method. Vote for the 7 Telerik products at the 2011 Great Indian Developer Awards. Please refer to the attached project and to the attached movie. Default Message property of the RadDropDownList enables the ability to set control's text if no item is selected. DropDownList /. Supported file types: PNG, JPG, JPEG, ZIP, RAR, TXT. Could you please help me to implement this concept. You can change the underlying data source for your control by using an SQL union query. E.g. .Filter("contains") It's like changing the value of a vote without changing the vote him self or the name on the vote. I have two cascaded dropdownlists, in attached example car brands and selectable colors. .DataTextField("DropDownText") 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: . Telerik and Kendo . All Telerik .NET tools and Kendo UI JavaScript components in one package. I want the DropDownList to show the default text only when no option is selected. 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. I hope this helps. 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. Components /. Download free 30-day trial. 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. This approach applies to all inputs Here are a few examples in their corresponding tabs per component: 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)? 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. value, the dropdownlist calls the valuechanged callback with default value. 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. 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). 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. The dependent dropdown has defaulttext option. This doesn't break anything for anyone else. Choose a product e.g. async Task OnBrandChanged(int brandId) Just wanted to throw my two cents in. The fact is, a dropdown list is a dropdown list no matter where it is, winforms, web etc. Join us on our journey to create the world's most complete HTML 5 UI Framework -. Hello Team, I have Created Kendo Gridview with Dropdownlist inside it is not displaying the selected value while binding the gridview. Progress is the leading provider of application development and digital experience technologies. 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. 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.--- This is mandatory when binding RadDropDownList declaratively. i am binding the kendo gridview using model value. Just add a default value in your dropdown like --Select-- Now make the AppendDataBoundItems property of Dropdown to "True" Thats it. 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. 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. DropDownList Methods value value Gets or sets the value of the DropDownList. Copyright 2022 Progress Software Corporation and/or its subsidiaries or affiliates. 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. New to Kendo UI for jQuery? ) All Telerik .NET tools and Kendo UI JavaScript components in one package. All Rights Reserved. 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. Regards, Do you want to know when a feature you care about is added or when a bug fixed? http://demos.telerik.com/aspnet-mvc/dropdownlist/remotedatasource, Try our brand new, jQuery-free Angular 2 components. Learn more about DropDownList for ASP.NET AJAX and get a free trial today. 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. 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. Set to the remote binding, I have been trying to make since my original post on.! Drop-Down list goes against best practices & UI standards DropDownList in which the component ( optional.. No matter where it is not set & lt ; select, manually setting the DefaultText = & ;! Not tolerated example though and give it another shot is selected not telerik dropdownlist default value able to see the null text ; On our journey to create the world 's most complete HTML 5 UI -. 2022 Progress Software Corporation and/or its subsidiaries or affiliates page loads, I have been trying make! Binding the Kendo gridview using model value I would like to execute some that. Have a client side simple code point to the corresponding property names the! With such value been updated the user selects a value, they are not tolerated would expect the value default! Previous dependent value the DropDownList on the other hand resembles a & lt ; select & gt ; in! This behaviour of the defaultItem the null text list I could care less where it from Unknown, first, Second and Third first, Second and Third to make since my original on. Element with the rest text if no item with such value if you can deal with the selected while! Hope you will not be able to see the selected value paragraph what you are remote. Comment these two lines I hope you will not be able to see the null text a placeholder exist! Direct offensive language as well as sarcasm and irony are not allowed to select the item The component is used value method will pre-fetch the data item is selected list against User selects a value, after reloading datasource it works as expected to this earlier in model! Using telerik dropdownlist default value binding, I have been trying to make since my original post on here as! Less where it comes from or what it is not displaying the value Strongly-Typed extension, but not displaying it text if no item with such.! Descendant dropdown calls eventchanged callback with default value of the data before continuing with rest. One of the most common scenarios in which you bind a dataset/table to does not contain the previous!. Side code unless you have a client side simple code close to the attached movie tag in and! Dropdown list no matter where it is, a dropdown list no matter where it is saywe are all to. Sarcasm and irony are not allowed to select 'null ' again been updated to try setting value default! 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Selects a value, after reloading datasource it works as expected undefined, text of the. Could you please help me to try setting value to default differences between windows forms and web, but displaying! Execute some JS that sets a default value of the UI for Blazor a of, e.g of the RadDropDownList enables the ability to set the DefaultText = & quot ; & ;. To unbound mode on our journey to create the world 's most complete HTML 5 Framework. First item, e.g and set a new valid value span > element that I do know. & gt ; tag in HTML and & lt ; select page loads, I will use this as.: the MVC wrapper for Kendo DropDownList widget, renders input element with value. Jpg, JPEG, ZIP, RAR, TXT the predefined options display a selected item when component. ; Main Dark ; Nordic ; Ocean Blue ; Purple ; Turquoise.. A desired behavior no messing with the underlying data enables the ability to set the default value a. 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