Angular Multiselect Dropdown Infinite Scroll

Angular multiselect dropdown component for web applications. Easy to integrate and use. It can be bind to any custom data source.

Demo

Getting Started

Features

• dropdown with single/multiple selction option
• bind to any custom data source
• search item with custom placeholder text
• limit selection
• select/de-select all items
• custom theme

Installation

npm install ng-multiselect-dropdown

And then include it in your module (see app.module.ts):

1import { NgMultiSelectDropDownModule } from 'ng-multiselect-dropdown-infinite-scroll';
2// ...
3
4@NgModule({
5  imports: [
6    NgMultiSelectDropDownModule.forRoot()
7    // ...
8  ]
9  // ...
10})
11export class AppModule {}

Usage

1import { Component, OnInit } from '@angular/core';
2import { IDropdownSettings } from 'ng-multiselect-dropdown';
3
4export class AppComponent implements OnInit {
5  dropdownList = [];
6  selectedItems = [];
7  dropdownSettings = {};
8  ngOnInit() {
9    this.dropdownList = [
10      { item_id: 1, item_text: 'Mumbai' },
11      { item_id: 2, item_text: 'Bangaluru' },
12      { item_id: 3, item_text: 'Pune' },
13      { item_id: 4, item_text: 'Navsari' },
14      { item_id: 5, item_text: 'New Delhi' }
15    ];
16    this.selectedItems = [
17      { item_id: 3, item_text: 'Pune' },
18      { item_id: 4, item_text: 'Navsari' }
19    ];
20    this.dropdownSettings:IDropdownSettings = {
21      singleSelection: false,
22      idField: 'item_id',
23      textField: 'item_text',
24      selectAllText: 'Select All',
25      unSelectAllText: 'UnSelect All',
26      itemsShowLimit: 3,
27      allowSearchFilter: true
28    };
29  }
30  onItemSelect(item: any) {
31    console.log(item);
32  }
33  onSelectAll(items: any) {
34    console.log(items);
35  }
36}

1<ng-multiselect-dropdown
2  [placeholder]="'custom placeholder'"
3  [settings]="dropdownSettings"
4  [data]="dropdownList"
5  [(ngModel)]="selectedItems"
6  (onSelect)="onItemSelect($event)"
7  (onSelectAll)="onSelectAll($event)"
8>
9</ng-multiselect-dropdown>

Settings

Setting	Type	Description	Default Value
singleSelection	Boolean	Mode of this component. If set true user can select more than one option.	false
placeholder	String	Text to be show in the dropdown, when no items are selected.	'Select'
disabled	Boolean	Disable the dropdown	false
data	Array	Array of items from which to select. Should be an array of objects with id and text properties. You can also use custom properties. In that case you need to map idField and textField properties. As convenience, you may also pass an array of strings, in which case the same string is used for both the ID and the text(no mapping is required)	n/a
idField	String	map id field in case of custom array of object	'id'
textField	String	map text field in case of custom array of object	'text'
enableCheckAll	Boolean	Enable the option to select all items in list	false
selectAllText	String	Text to display as the label of select all option	Select All
unSelectAllText	String	Text to display as the label of unSelect option	UnSelect All
allowSearchFilter	Boolean	Enable filter option for the list.	false
searchPlaceholderText	String	custom search placeholder	Search
clearSearchFilter	Boolean	clear search filter on dropdown close	true
maxHeight	Number	Set maximum height of the dropdown list in px.	197
itemsShowLimit	Number	Limit the number of items to show in the input field. If not set will show all selected.	All
limitSelection	Number	Limit the selection of number of items from the dropdown list. Once the limit is reached, all unselected items gets disabled.	none
searchPlaceholderText	String	Custom text for the search placeholder text. Default value would be 'Search'	'Search'
noDataAvailablePlaceholderText	String	Custom text when no data is available.	'No data available'
closeDropDownOnSelection	Boolean	Closes the dropdown when item is selected. applicable only in cas of single selection	false
defaultOpen	Boolean	open state of dropdown	false
allowRemoteDataSearch	Boolean	allow search remote api if no data is present.	false

Callback Methods

• onScrollEnd - Return True/False if the scroll has completed on the Dropdown Example : (onScrollEnd)="onItemSelect($event)"
• onSelect - Return the selected item when an item is checked. Example : (onSelect)="onItemSelect($event)"
• onSelectAll - Return the all items. Example : (onSelectAll)="onSelectAll($event)".
• onDeSelect - Return the unselected item when an item is unchecked. Example : (onDeSelect)="onItemDeSelect($event)"
• onFilterChange - Return the key press. Example : (onFilterChange)="onFilterChange($event)"
• onDropDownClose- Example : (onDropDownClose)="onDropDownClose()"

Custom Theme

• The component package has a themes folder in node_modules at ng-multiselet-dropdown-infinite-scroll\themes\ng-multiselect-dropdown-infinite-scroll.theme.scss
• Include the ng-multiselet-dropdown-infinite-scroll.theme.css in angular-cli.json (for versions below angular 6) and angular.json (for version 6 or more).
• Refer this file on how to add the css file to your angular project.

Custom Template(in beta):

Variables can be used in template

1. id: return id as number
2. option: return option text. return string
3. isSelected: determine if item is selected or not. returns boolean

Template for each item

<ng-template #optionsTemplate let-item let-option="option" let-id="id" let-isSelected="isSelected">
  {{option}}
</ng-template>

Template for selected item

<ng-template #optionSelectedTemplate optionSelectedTemplate let-option="option"  let-id="id">
  {{option}}
</ng-template>

Demo

Run locally

• Clone the repository or downlod the .zip,.tar files.
• Run npm install
• Run ng serve for a dev server
• Navigate to http://localhost:4200/

Library Build / NPM Package

Run yarn build:lib to build the library and generate an NPM package. The build artifacts will be stored in the dist-lib/ folder.

Running unit tests

Run yarn test to execute the unit tests.

Development

This project was generated with Angular CLI version 1.7.1.

Contributions

Contributions are welcome, please open an issue and preferrably file a pull request.

Opening Issue

Please share sample code using codesandbox.com or stackblitz.com to help me re-produce the issue.

License

MIT License.