Angular select component with tree items

Ngx-tree-selec

Features:

• Dropdown with ‘flat’ items (Like normal select)
• Dropdown with hierarchical items
• Simple or multiple selected items
• With hierarchical datas you can force child selection or allow select parent
• ngModel & standard validation compliant
• Can limit displayed selected items (… link allow your user to see entire selection)

Installation

This is how to install the components:

npm install ngx-tree-select

or

yarn add ngx-tree-select

And on your application module:

import {NgxTreeSelectModule} from 'ngx-tree-select';

@NgModule({
  declarations: [ ...],
  imports: [
    BrowserModule,
    ....,
    NgxTreeSelectModule.forRoot({
      allowFilter: true,
      filterPlaceholder: 'Type your filter here...',
      maxVisibleItemCount: 5,
      idField: 'id',
      textField: 'name',
      childrenField: 'children',
      allowParentSelection: true
    })
],
})
export class AppModule { }

See below for SystemJs / UMD installation.

Default options

When you call NgxTreeSelectModule.forRoot you must pass default options. This options can be empty object “{}” or you can add one or more settings :

• allowFilter : display filter input on dropdown
• filterPlaceholder : determine placeholder text for filter
• maxVisibleItemCount : determine maximum number of items are displayed on multiple select
• idField : determine which property of your items is used as unique identifier
• textField : determine which property of your items is displayed
• childrenField : determine which property of yours items contains children items
• allowParentSelection : if set to true, you can select parent, else when you select parent all children are selected
• expandMode : Define which item are expand at initilization. Possible value are : None, Selection or All

Using the Tree Select

We will need to add first a version of Font Awesome to our page, for example:

<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet">

Then we can use the Tree Select like this:

<form novalidate>
  <tree-select name="simpleSelect"
              [items]="items"
              childrenField="children"
              [(ngModel)]="simpleSelected"
              required=true
              #simpleSelect="ngModel"
              [filterPlaceholder]="FilterPlaceholder"
              [allowFilter]="ShowFilter"
              [disabled]="Disabled"
              [allowParentSelection]="AllowParentSelection"
              expandMode="all"></tree-select>
  <div *ngIf="simpleSelect.errors && (simpleSelect.dirty || simpleSelect.touched)" class="alert alert-danger">
    <div [hidden]="!simpleSelect.errors.required">Simple select is required</div>
  </div>
</form>

<form novalidate>
  <tree-select name="multipleSelect"
              [items]="items"
              childrenField="children"
              [multiple]="true"
              [(ngModel)]="multipleSelected"
              filterPlaceholder="Type item filter..."
              required=true
              minlength="2"
              maxlength="4"
              [allowParentSelection]="AllowParentSelection"
              #multipleSelect="ngModel"
              [filterPlaceholder]="FilterPlaceholder"
              [maxVisibleItemCount]="MaxDisplayed"
              [allowFilter]="ShowFilter"
              [disabled]="Disabled">
  </tree-select>
  <div *ngIf="multipleSelect.errors && (multipleSelect.dirty || multipleSelect.touched)" class="alert alert-danger">
    <div [hidden]="!multipleSelect.errors.required">Multiple select is required</div>
    <div [hidden]="!multipleSelect.errors.minlength">You must choose at least 2 items on Multiple select</div>
    <div [hidden]="!multipleSelect.errors.maxlength">You must choose maximum 4 items on Multiple select</div>
  </div>

Component attributes

When you place tree-select on HTML template you can define :

• items : list of items
• multiple : allow multiple selection
• disabled : disable component
• allowFilter : display filter input on dropdown
• filterPlaceholder : determine placeholder text for filter
• maxVisibleItemCount : determine maximum number of items are displayed on multiple select
• idField : determine which property of your items is used as unique identifier
• textField : determine which property of your items is displayed
• childrenField : determine which property of yours items contains children items
• allowParentSelection : if set to true, you can select parent, else when you select parent all children are selected
• expandMode : Define which item are expand at initilization. Possible value are : None, Selection or All

tree-select component use default options define when you call NgxTreeSelectModule.forRoot except if you override it with attribute on HTML template.

Running the Demo Application

This command will build and start the demo application:

npm start

Running This Module In Development

First let’s build the library using this command:

npm run lib:build

Then let’s link it:

cd dist_package\ngx-tree-select
npm link

On another folder on the same machine where we have for example a running Angular CLI, we then do:

npm link ngx-tree-select

Running the Tests

The tests can be executed with the following commands:

npm run test
npm run e2e

Using SystemJs via the UMD bundle ?

Make sure to add this to your map configuration, if you need the module served from a CDN:

map: {

   ...
   'ngx-tree-select': 'https://unpkg.com/ngx-tree-select@<version number>/ngx-tree-select.rollup.umd.min.js'
}

Otherwise if serving from node_modulesdirectly:

map: {
   ...
   'ngx-tree-select': 'node_modules/ngx-tree-select/bundles/ngx-tree-select.umd.min.js'
}

And in our packages property:

packages: {
   ...
  'ngx-tree-select': {
    main: 'index.js',
    defaultExtension: 'js'
  }

}

Download Details:

Author: Crazyht

Live Demo: https://crazyht.github.io/ngx-tree-select/

GitHub: https://github.com/Crazyht/ngx-tree-select

#angular #javascript #angularjs

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Install Angular - Angular Environment Setup Process

Angular is a TypeScript based framework that works in synchronization with HTML, CSS, and JavaScript. To work with angular, domain knowledge of these 3 is required.

1. Installing Node.js and npm
2. Installing Angular CLI
3. Creating workspace
4. Deploying your First App

In this article, you will get to know about the Angular Environment setup process. After reading this article, you will be able to install, setup, create, and launch your own application in Angular. So let’s start!!!

Install Angular in Easy Steps

For Installing Angular on your Machine, there are 2 prerequisites:

• Node.js
• npm Package Manager

Node.js

First you need to have Node.js installed as Angular require current, active LTS or maintenance LTS version of Node.js

Download and Install Node.js version suitable for your machine’s operating system.

Npm Package Manager

Angular, Angular CLI and Angular applications are dependent on npm packages. By installing Node.js, you have automatically installed the npm Package manager which will be the base for installing angular in your system. To check the presence of npm client and Angular version check of npm client, run this command:

1. npm -v

Installing Angular CLI

• Open Terminal/Command Prompt
• To install Angular CLI, run the below command:

1. npm install -g @angular/cli

· After executing the command, Angular CLI will get installed within some time. You can check it using the following command

1. ng --version

Workspace Creation

Now as your Angular CLI is installed, you need to create a workspace to work upon your application. Methods for it are:

• Using CLI
• Using Visual Studio Code

1. Using CLI

To create a workspace:

• Navigate to the desired directory where you want to create your workspace using cd command in the Terminal/Command prompt
• Then in the directory write this command on your terminal and provide the name of the app which you want to create. In my case I have mentioned DataFlair:

1. Ng new YourAppName

• After running this command, it will prompt you to select from various options about the CSS and other functionalities.

• To leave everything to default, simply press the Enter or the Return key.

#angular tutorials #angular cli install #angular environment setup #angular version check #download angular #install angular #install angular cli

Basics of Angular: Part-1

What is Angular? What it does? How we implement it in a project? So, here are some basics of angular to let you learn more about angular.

Angular is a Typescript-based open-source front-end web application platform. The Angular Team at Google and a community of individuals and corporations lead it. Angular lets you extend HTML’s syntax to express your apps’ components clearly. The angular resolves challenges while developing a single page and cross-platform applications. So, here the meaning of the single-page applications in angular is that the index.html file serves the app. And, the index.html file links other files to it.

We build angular applications with basic concepts which are NgModules. It provides a compilation context for components. At the beginning of an angular project, the command-line interface provides a built-in component which is the root component. But, NgModule can add a number of additional components. These can be created through a template or loaded from a router. This is what a compilation context about.

What is a Component in Angular?

Components are key features in Angular. It controls a patch of the screen called a view. A couple of components that we create on our own helps to build a whole application. In the end, the root component or the app component holds our entire application. The component has its business logic that it does to support the view inside the class. The class interacts with the view through an API of properties and methods. All the components added by us in the application are not linked to the index.html. But, they link to the app.component.html through the selectors. A component can be a component and not only a typescript class by adding a decorator @Component. Then, for further access, a class can import it. The decorator contains some metadata like selector, template, and style. Here’s an example of how a component decorator looks like:

@Component({
    selector: 'app-root',
    templateUrl: 'app.component.html',
    styleUrls: ['app.component.scss']
})

Role of App Module

Modules are the package of functionalities of our app. It gives Angular the information about which features does my app has and what feature it uses. It is an empty Typescript class, but we transform it by adding a decorator @NgModule. So, we have four properties that we set up on the object pass to @NgModule. The four properties are declarations, imports, providers, and bootstrap. All the built-in new components add up to the declarations array in @NgModule.

@NgModule({
declarations: [
  AppComponent,
],
imports: [
  BrowserModule,
  HttpClientModule,
  AppRoutingModule,
  FormsModule
],
bootstrap: [AppComponent]
})

What is Data Binding?

Data Binding is the communication between the Typescript code of the component and the template. So, we have different kinds of data binding given below:

• When there is a requirement to output data from our Typescript code in the HTML template. String interpolation handles this purpose like {{data}} in HTML file. Property Binding is also used for this purpose like [property] = “data”.
• When we want to trigger any event like clicking a button. Event Binding works while we react to user events like (event) = “expression”.
• When we can react to user events and output something at the same time. Two-way Binding is used like [(ngModel)] = “data”.

#angular #javascript #tech blogs #user interface (ui) #angular #angular fundamentals #angular tutorial #basics of angular

Angular Architecture Components and Features

Angular is one of the most popular frameworks for developing Desktop and mobile applications for clients. Angular application uses HTML and TypeScript. You can use this in cross-platform mobile development via IONIC. Angular Implements both Core and Optional functionalities in the form of TypeScript libraries that you can import in your application. You should have domain knowledge of HTML, CSS, and JavaScript for working with Angular. In this Angular Tutorial by DataFlair, we will learn about Angular Architecture and its components.

There are three basic things in Angular that are Components, Modules, and Routing. An angular app is a combination of different NgModules as modules are the building block of angular. Components, on the other hand, are responsible for defining the views, which are a part of elements of the screen. You can change the Views using data and program logic. Routing is the functionality that links multiple components together.

Architecture of Angular

The Building blocks of Angular Architecture as depicted in the image are:

• Module
• Template
• Component
• Metadata
• Data Binding
• Services
• Directives
• Dependency Injection

Let us learn each of these Angular Architecture Components in detail now:

1. Module

Angular is a modular platform and it may contain one or more Angular Module or NgModules depending on the demand. It is the essential module that is always present is the Root module namely “AppModule” in the application.

NgModule is a Decorator function that handles the compilation part of the application. It works in synergy with other modules. It takes a single object in the form of Metadata. NgModule communicates with other modules for bootstrapping them and works in the Parent-Child relationship for the proper execution of the application.

Here are the properties of NgModule:

#angular tutorials #angular architecture #angular architecture components #angular architecture working

Collection of 14 Vue Select Component for Vue.js App

Vue select component can handle multiple selections. It’s enabled with the multiple property. Like with the single selection, you can pull out the new value by accessing event. target. value in the onChange callback.

1. Vue GridMultiselect

Simple multi-select component with items displayed in a table like UI.

Demo

Download

---

2. vue-select

Everything you wish the HTML <select> element could do, wrapped up into a lightweight, extensible Vue component.

Vue Select is a feature rich select/dropdown/typeahead component.

Features

• Tagging
• Filtering / Searching
• Vuex Support
• AJAX Support
• SSR Support
• ~20kb Total / ~5kb CSS / ~15kb JS
• Select Single/Multiple Options
• Customizable with slots and SCSS variables
• Tested with Bootstrap 3/4, Bulma, Foundation
• +95% Test Coverage
• Zero dependencies

Demo

Download

---

3. @desislavsd/vue-select

Lightweight and mighty select component like Chosen and Select 2 done the Vue way.

Features

• Uses v-model
• Single / Multiple selection
• Tagging + custom key triggers
• List Filtering / Searching
• Support for async list source
• Out of the box AJAX support using fetch
• Debounce AJAX requests
• Transparent access to input attributes
• Highly customizable
• Zero dependencies

Demo

Download

---

4. v-super-select

An accessible and customizable select/drop down component that features searching, grouping, and virtual scrolling.

Demo

Download

---

5. vue-dynamic-select

A VueJS plugin that provides a searchable and reactive select list component with no dependencies.

Download

---

6. @alfsnd/vue-bootstrap-select

A vue version of bootstrap select

Demo

Download

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7. vue-selectize

Vanila Vue.js component that mimics Selectize behaviour (no need jquery dependency)

Demo

Download

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8. vue2-selectize

A Selectize wrapper for VueJS 2.

Demo

Download

---

9. v-suggest

A Vue2 plugin for input content suggestions, support keyboard to quick pick.

Demo

Download

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10. vue-multi-select

This component gives you a multi/single select with the power of Vuejs components.

Demo

Download

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11. v-cascade

A lovely component of cascade selector with vue.js (Support both of PC and Mobile)

Demo

Download

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12. stf vue select VUE2

stf vue select - most flexible and customized select

For detailed explanation on how things work, checkout the DEMO

Demo

Download

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13. Advanced Vue.js Chained Select

Using Vue.js to chain mulitiple select inputs together.

Demo

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14. Vue Select2

A native Vue.js component that provides similar functionality to Select2 without the overhead of jQuery.

Rather than bringing in jQuery just to use Select2 or Chosen, this Vue.js component provides similar functionality without the extra overhead of jQuery, while providing the same awesome data-binding features you expect from Vue. Vue-select has no JavaScript dependencies other than Vue, and is designed to mimic Select2.

Demo

Download

---

Thank for read!

#vue-select #vue-select-component #vue-js #select-component

Angular Components and Their Types

In Angular, components play a very important role. The whole structure of the application is built using different components. Components help in maintaining the modularity of the application as they are reusable. Components control the view, i.e. components are the classes that interact with the HTML file and ultimately resulting in controlling what is displayed in the browser. In this article, you will get to know about all the various components present in the angular application by default and how you can add or remove components.

#angular tutorials #angular components #angular