The https://feedback.telerik.com/blazor/1517344-filter-text-is-cleared-when-you-select-an-item ticket fixed a good usability issue with multiselect. Unfortunately, it creates a bug I ran into while starting to update my applications MultiSelects.

If you have PersistFilterOnSelect=true property set, but not AutoClose=false what happens is the user types '2' to filter the selection, selects something with the mouse and the drop down closes, but the filter doesn't clear so when next trying to select an item the old filter is still there, although it's not showing. The only way to clear the ghost filter seems to be to start typing a new thing to filter on and then backspace that which finally removes the ghost.

The docs kind of mention this with "To keep the filter upon selection, set the PersistFilterOnSelect parameter to true. It only applies when Filterable="true" and AutoClose="false"" but the ghost filter staying is clearly a bug. You can test this behaviour with a repl I made. Click the multiselect active, type for.ex. '2' and select an item with the mouse, the item is selected, the dropdown closed and the filter vanishes. Now click the multiselect again, the dropdown is already filtered as if '2' had been pressed, but it's not visible and can't be cleared without typing a new filter

Below is a screenshot where I typed 22 as the filter, selected Item 22 and then clicked the MultiSelect again

The dropdown (select) components such as ComboBox, MultiSelect etc. have a built-in loading indicator that includes several Skeleton instances.

I want to be able to remove that and add my custom loading indicator in the popup. Ideally, it would be a template so we could have some flexibility.

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ADMIN EDIT

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This request targets all the select components (AutoComplete, ComboBox, DropDownList, MultiColumnComboBox, MultiSelect).

The DropDownList currently does not have a built-in loader but that will be added as well as a prerequisite for the current feature. See Add a loading indicator in the popup.

When I click on the CheckBox's label, "Select All," the dropdown closes. While if I click the TelerikCheckBox itself, it remains open.

I have set a small size to the MultiSelect. I noticed that the Summary Tag that contains the "1 more selected" text does not change - its size always remains the same regardless of the component size.

Reproduction: https://blazorrepl.telerik.com/cxFvPxvh58SMoekS04.

The Roundness setting of the MultiSelect also does not affect the summary tag.

 

When AutoClose is set to false and you select more than one item, then only the first one will be highlighted in the popup. Items are selected and present in the input but are visually highlighted.

Reproduction 

1. Run this REPL sample
2. Select more than one item from the drop-down
3. Only the first selected item is highlighted as such
4. Video example

Current

Not all selected items are highlighted, which does not match the Input.

Expected

All selected items in the drop-down should be highlighted. 

Our issue is when we are using OnRead for fetching data based on the entered text, the keyboard navigation is not working. The scroll mode is virtual. The volume of data will be large.

Testing this Select All Checkbox sample in Safari produces a different result compared to other browsers.

Click on the CheckBox in the MultiSelect Header Template closes the popup in Safari. In other browsers (e.g. Chrome, Firefox) the popup remains open after checking the SelectAll CheckBox.

Telerik Multi Select to have optional top level header item with check box & title "Select All" [Localizable]. 

If all items are selected, the display box of the Multi-Select should show "All Selected" instead of list of selected items.

To reproduce:

• Use the Local Data code snippet
• Open the popup
• Scroll down
• Close the popup
• Open the popup again
• Blank space will be rendered above the visible items.

Description

In Firefox, there are occasions in which multiple items remain focused (k-focus class is not removed from the blurred item)

Reproduction (if bug)

1. Create a multiselect and set AutoClose="false".
2. Open the component and select a few items.
3. Close the component.
4. Open the component and select a new item.
5. Two items have the k-focus class.

Second related case:

1. Create a multiselect and set AutoClose="false".
2. Open the component and navigate up and down with the keyboard arrows.
3. Select an item.
4. The last focused item with the arrows is focused as well as the newly selected item.

REPL for reproduction

Expected (if bug)

Only one item should have the k-focus class at a time.

Browser (if bug)

Firefox

Broken Telerik UI for Blazor version (if bug)

3.5.0

My question is regarding MultiSelect. I would like to order the groups inside the MultiSelect as follows:

Category 2

- Item 1

- Item 2

Category 1

- Item 3

- Item 4

But the MultiSelect control seems to order the category name alphabetically (Category 1, Category 2, etc).

The MultiSelect does not update its tags when selecting items with the keyboard when the component is housed in the ContextMenu

This appears to be documented behavior, but it also seems to me like this is something that the component should be handling.

When using row virtualization with a Grid, a DropDownList, a MultiSelect, etc, the OnRead is called for every scroll event, regardless of whether the component _actually_ needs to fetch new data or not.

 

For example:  A DropDownList with a PageSize of 100, but with only 10 items visible in the dropdown at a time will ask for 100 records every time the user even scrolls 1 record down. This results in many requests to the backend server, with many of the results being the majority of the contents from the previous request.

 

I have worked around this by implementing a buffer that keeps results for me and returns them as the user scrolls, only requesting for more from the backend server when the buffer runs out, but this feels like something that the components themselves should be handling.

 

If this is expected behavior, all good.  Just wanted to raise some awareness on it.

Using row virtualization on MultiSelect, and am attempting to put a loading indicator into the popup content if the request to the server is still ongoing.

 

Problem with this is that the popup contents don't update if the popup is open when loading finishes.  I put together a reproduction on Telerik REPL showing the behavior I am experiencing.

https://blazorrepl.telerik.com/mvvQvVvN2458vinQ36

 

Note, Options finish loading (seen by the div update above the MultiSelect component), but if the popup is open, the contents do not update to reflect the loaded options.

 

 

My current workaround is to just make the MultiSelect disabled while it is doing its initial load.

If the Multiselect has items selected and is not focused, clearing one item does not focus the component while clearing all items does. Deselecting single item should focus the component as well.

The following, took a bit of effort to identify where the behaviour was failing for a screen reader.

 

for all scenarios below the multi-select component currently has items (more than one) in it as selected.

 

GOOD

if keyboard focus is on text edit, and u leave the component (w/ tab key), when revisiting the component (w/ shift+tab keys) all selected items are read out correctly

 

BAD

if keyboard focus is on selected item, and u leave the component (w/ tab key), when revisiting the component (w/ shift+tab key) the focused (selected) item is not read out correctly.

(sorry example read out not provided)

GOOD

selected items are read out correctly when;

• closing items panel w/ escape key,
• closing items panel when selecting an item
  

 

BAD

delete item;

• remove all selected items w/ escape key does not inform a screen reader user of the outcome; that no item is now selected (should state something).

• removing last item with backspace does not inform screen reader of the outcome; that no item is now selected (should state something). I swear this worked once with firefox.
  

the following behaviour also occurs after removing all items via a keyboard, the keyboard focus becomes lost;

• (BAD) most times u can't press a right / down key into the text section of the multi-select (experienced w/ firefox too)
• (GOOD) most times can press alt+down to bring the panel (experienced w/ firefox too)
• (GOOD) u can still tab out to next clickable object

When user is inside list of selected options/items, navigating amongst the items with keyboard left/right keys, it states "item # of # of items of level 1". 
what is "of level 1"? (is items selected in level 1 and level 2 is the text editable section?)

i am expecting the screen reader to state item "<value/label/title>" when i set focus to an item via keyboard left or right.

The issue did not occur in firefox. Sorry, i have not provided the firefox readout w/ the screen reader for comparison.

 

however, for the most likely user scenario the behaviour with the screen reader is correct.

if keyboard focus is on text edit, and u leave the component (w/ tab key), when revisiting the component (w/ shift+tab keys) all selected items are read out correctly

 

tested in Chrome and firefox using NVDA.

 

 

 

Hi,

I would like checkbox support including the check all checkbox on the multiselect component like: https://docs.telerik.com/devtools/aspnet-ajax/controls/combobox/functionality/checkbox-support

The url below shows how to create custom checkboxes in the multiselect component but adding a check all checkbox in the headertemplate does not update the multiselect popup

https://docs.telerik.com/blazor-ui/knowledge-base/multiselect-checkbox-in-dropdown?_ga=2.50111909.206897922.1631541466-694624900.1630583797&_gac=1.246637872.1631604077.EAIaIQobChMI8PnX6Pb98gIVkwCLCh381AjMEAAYASAAEgLROPD_BwE

In drop down panel colour indicates which option has been selected (is it the dark colour or is the light colour). Suggestion: having an icon of tick would assist.

 

As an alternative option - Blazor MultiSelect - Templates | Telerik UI for Blazor this would be great if you could template selected and non-selected items, but at the moment there is just the one item template.