Completed
Last Updated: 11 May 2022 19:03 by ADMIN
Marcel
Created on: 10 Jun 2019 20:54
Category: DropDownList
Type: Feature Request
18
MaxPopupHeight

Right now when a DropDownList has PopupHeight="Auto" the popup gets the height necesaary to display its items properly.

But when there are many items the popup also displays all items without a vertical scrollbar (maybe over the entire page and beyond), which is not good.

 

My suggestion would be to add a property for specifyig a "MaxPopupHeight" to limit the growth of the popup.

Also if "PopupHeight" is not specified it should take "Auto" as the default value instead of a static height in px, instead give the new "MaxPopupHeight" a limiting default value.

***Admin Edit***

Released in 3.0.0 through PopupSettings tag: https://docs.telerik.com/blazor-ui/upgrade/breaking-changes/3-0-0#popup-settings

***Admin Edit***

6 comments
ADMIN
Marin Bratanov
Posted on: 11 May 2022 19:03

Hello,

You can do this with a parameter now, this is why this feature is marked as Completed, so you don't have to hunt CSS selectors and HTML structure. Nevertheless, you can read more about some theme changes that happened recently here.

Here's an example:

Selected value: @selectedValue
<br />

<TelerikDropDownList Data="@myDdlData" TextField="MyTextField" ValueField="MyValueField" @bind-Value="selectedValue">
    <DropDownListSettings>
        <DropDownListPopupSettings MaxHeight="50px" />
    </DropDownListSettings>
</TelerikDropDownList>

@code {
    //in a real case, the model is usually in a separate file
    //the model type and value field type must be provided to the dropdpownlist
    public class MyDdlModel
    {
        public int MyValueField { get; set; }
        public string MyTextField { get; set; }
    }

    int selectedValue { get; set; }

    IEnumerable<MyDdlModel> myDdlData = Enumerable.Range(1, 20).Select(x => new MyDdlModel { MyTextField = "item " + x, MyValueField = x });
}

 

Regards,
Marin Bratanov
Progress Telerik

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Hannes
Posted on: 11 May 2022 12:31

This breaks with Version 3.2.0

I attached an example https://blazorrepl.telerik.com/cmYpbPvc29jsvdnR33

Do you have changed the HTML structure of dropdowns?

ADMIN
Marin Bratanov
Posted on: 26 Jun 2021 15:27

Hello,

Here is a basic example that illustrates my previous point:

<style>
    .limited-height {
        max-height: 100px;
    }
</style>

Selected value: @selectedValue
<br />

<TelerikDropDownList Data="@myDdlData" TextField="MyTextField" ValueField="MyValueField" @bind-Value="selectedValue"
                     PopupHeight="" PopupClass="limited-height">
</TelerikDropDownList>

@code {
    //in a real case, the model is usually in a separate file
    //the model type and value field type must be provided to the dropdpownlist
    public class MyDdlModel
    {
        public int MyValueField { get; set; }
        public string MyTextField { get; set; }
    }

    int selectedValue { get; set; }

    //Define a preselected value when the component initializes
    protected override void OnInitialized()
    {
        selectedValue = 3;
    }

    IEnumerable<MyDdlModel> myDdlData = Enumerable.Range(1, 20).Select(x => new MyDdlModel { MyTextField = "item " + x, MyValueField = x });
}

 

Regards,
Marin Bratanov
Progress Telerik

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! Check it out at https://learn.telerik.com/.

n/a
Posted on: 25 Jun 2021 19:58
Can you explain how to use this with CSS.  We have alot of DropDownLists in our app and I would like to consolidate this into CSS. Thanks
ADMIN
Marin Bratanov
Posted on: 01 Mar 2021 17:26

Hi all,

This is now possible through CSS and the PopupClass parameter - you can set the max-height of the dropdown element with a CSS rule now, even while using PopupHeight (e.g., PopupHeight="auto").

 

Regards,
Marin Bratanov
Progress Telerik

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! Check it out at https://learn.telerik.com/.

ADMIN
Marin Bratanov
Posted on: 11 Jun 2019 12:05
Hi Marcel,

Thank you for the ideas.

I modified the title to make it clearer. I also created a separate item for changing the default behavior of the PopupHeight property and you can Follow it here: https://feedback.telerik.com/blazor/1412736-popupheight-to-default-to-auto.


Regards,
Marin Bratanov
Progress Telerik UI for Blazor