React.js Blueprint Select2 Custom Menu

Blueprint is a React-based UI toolkit for the web. This library is very optimized and popular for building interfaces that are complex and data-dense for desktop applications.

In this article, we’ll discuss the React.js Blueprint Select2 Custom menu. Select2 component displays a list of items to choose one item and item children are wrapped in a MenuItem that contains the list and an optional InputGroup to filter the items. Select2 provides users to render a custom menu by changing the menu layout or items.

React.js BluePrint Select2 Props:

• activeItem: It denotes the currently active item that is used for keyboard interactions.
• children: It denotes the element which triggers the select popover.
• className: It denotes a list of class names to pass along to a child element.
• createNewItemFromQuery: It allows the creation of new items from the current query string provided.
• createNewItemPosition: It denotes the createNewItem position within the list, either first or last.
• createNewItemRenderer: It helps in creating a selectable Create Item option from the current query string.
• disabled: It specifies whether the component will be disabled or interactive.
• fill: It determines whether the component should take up the full width of its container. 
• filterable: It determines whether the dropdown list can be filtered.
• initialContent: It denotes the default React component that renders when the query string is empty.
• inputProps: It denotes the props that are used to spread to the query InputGroup.
• itemDisabled: It determines whether the given item is disabled.
• itemListPredicate: It is used to customize the querying of entire items array, passed as props. 
• itemListRenderer: It is used to custom render the contents of the dropdown.
• itemPredicate: It is used to customize the querying of individual items of the items array.
• itemRenderer: It is used to custom render an item in the dropdown list.
• items: It denotes the array of items in the list.
• itemsEqual: It is used in determining whether the two items are equal.
• menuProps: It denotes the props that are used to spread to the Menu listbox containing the selectable options.
• noResults: It is used to render a React component when the filtering returns zero results.
• onActiveItemChange: It is a callback function that gets Invoked when user interaction changes the active item.
• onItemSelect: It is a callback function that gets invoked when an item from the list gets selected, typically by clicking or pressing the enter key.
• onItemsPaste: It is a callback function that gets invoked when multiple items get selected at once.
• onQueryChange: It is a callback function that gets invoked when the query string is changed.
• popoverContentProps: It denotes the props that are used to spread to the Popover2 content wrapper element.
• popoverProps: It denotes the props to spread to Popover.
• popoverRef: It denotes the optional ref for the Popover2 instance.
• popoverTargetProps: It denotes the props that are used to add to the popover target wrapper element.
• query: It denotes the query string passed to itemListPredicate or itemPredicate to filter items.
• resetOnClose: It determines whether the active item should be reset to the first matching item when the popover closes.
• resetOnQuery: It determines whether the active item should reset to the first matching item every time the query changes.
• resetOnSelect: It determines whether the active item should be reset to the first matching item when an item is selected.
• scrollToActiveItem: It determines whether the active item should always be scrolled into view when the prop changes.

Syntax:

<Select2
    itemListRenderer={renderCustomMenu}
>
    <Button disabled={true}>
</Select2>

Creating React Application And Installing Module:

Step 1: Create a React application using the following command:

npm create-react-app appname

Step 2: After creating your project folder i.e. appname, move to it using the following command:

cd appname

Step 3: After creating the ReactJS application, Install the required module using the following command:

npm install @blueprintjs/core

Step 4: Installing @blueprintjs Select component.

npm install @blueprintjs/select

Project Structure:

 

Steps to run the application: Run the project as follows:

npm start

Example 1: The below example demonstrates the usage of the custom menu with the help of itemListRenderer prop in the select2 component.

Output:

 

Example 2: The below example demonstrates the usage of the disabled custom menu in the select2 component.

Output:

 

Reference: https://blueprintjs.com/docs/#select/select2.custom-menu