angular-tag-cloud-module

With this module you can generate word clouds / tag clouds. The module requires a peer dependency to angular/core >= Version 6.0.0.

For working with Angular 5 and 4, please use version 2.6.0 by installing via npm i angular-tag-cloud-module@2.6.0.

The project is based on angular-tag-cloud which provides a tag cloud for Angular 1.X.X applications.

Demo

Check out the demo page to play around with the options: https://d-koppenhagen.github.io/angular-tag-cloud-module/

Install

To install the module just run the following command on your CLI:

npm install --save angular-tag-cloud-module

Or if you use yarn:

yarn add angular-tag-cloud-module

Full Documentation

For having a look at the full documentation clone this repo to your local disk first. Then navigate in the directory and run npm run doc via console (probably you have to install the nodejs dependencies before: npm install). The documentation can be accessed in your browser: localhost:8080.

Usage

1. Import the module into your Angular-NgModule:

// app.module.ts
import { TagCloudModule } from 'angular-tag-cloud-module';

@NgModule({
  imports: [
    TagCloudModule
  ]
})
export class AppModule { }

2. Setup the cloud:

import { Component } from '@angular/core';
import { CloudData, CloudOptions } from 'angular-tag-cloud-module';

@Component({
  selector: 'my-component',
  template: `
    <div>
      <angular-tag-cloud
        [data]="data"
        [width]="options.width"
        [height]="options.height"
        [overflow]="options.overflow">
      </angular-tag-cloud>
    </div>
  `
})
export class AppComponent {
  options: CloudOptions = {
    // if width is between 0 and 1 it will be set to the size of the upper element multiplied by the value 
    width: 1000,
    height: 400,
    overflow: false,
  };

  data: CloudData[] = [
    {text: 'Weight-8-link-color', weight: 8, link: 'https://google.com', color: '#ffaaee'},
    {text: 'Weight-10-link', weight: 10, link: 'https://google.com', tooltip: 'display a tooltip'},
    // ...
  ];
}

You can either pass configuration properties as an Input (As shown in the example above) or pass a an object described by the CloudOptions-Interface using the config property as shown below.

<angular-tag-cloud [config]="options" [data]="data"></angular-tag-cloud>

You can use one of the following HTML-Tags for the tag cloud in your template:

• <angular-tag-cloud ...></angular-tag-cloud>
• <ng-tag-cloud ...></ng-tag-cloud>
• <ngtc ...></ngtc>

Please keep this in mind, that the weight property defines the relative importance of the word (such as the number of occurrencies, etc.). The range of values is arbitrary, and they will be linearly mapped to a discrete scale from 1 to 10. In fact passing just one word to the array has the effect that this is relative to other elements. As there aren't any other elements in that case it's result is that the element becomes a container with the class w5 - right in the middle of the discret scale. So the given value for weight is not directly mapped to the CSS-class. For example you can use also a value like 123 or 34 - it will always be mapped to a scale from 1 to 10 relativly to the other array elements. If you don't want that the tag cloud is calculating the values manually, set the strict property to true and use integer values 1 to 10 within the weight property. If you want the tag cloud to randomly generate an angle for each entry (when it is undefined), set randomizeAngle property to true. The step property defines the steps which will be added for the next cloud element to check during calculation. The calculation starts somewhere in the middle of the canvas. The steps will be increased by the given value like a spiral to the outer canvas area. When the algorithm detects that there is space for the current element, it will be added to the cloud. A lower value for the step attribute is more granular and precisely but needs also more time and processing power during the cloud creation.

Check out the demo-Folder for a complete example

Example: Rotate some elements

If you want to rotate some CloudData elements, you can specify a numeric value for rotation within the rotate-Attribute:

import { Component } from '@angular/core';
import { CloudData } from 'angular-tag-cloud-module';

@Component({
  selector: 'my-component',
  template: `
    <angular-tag-cloud [data]="data"></angular-tag-cloud>
  `
})
export class AppComponent {

  data: CloudData[] = [
    { text: 'weight-5-rotate(+10)', weight: 5, rotate: 10 }
    { text: 'weight-7-rotate(-20)', weight: 7, rotate: -20 }
    { text: 'weight-9-rotate(+35)', weight: 9, rotate: 35 }
    // ...
  ];
}

Example: Zoom elements on hover

You can specify the zoomOnHover property with an object that defines the zoom level (scale) and optionally a time for the transition (transitionTime):

import { Component } from '@angular/core';
import { CloudData, ZoomOnHoverOptions } from 'angular-tag-cloud-module';

@Component({
  selector: 'my-component',
  template: `
    <angular-tag-cloud [data]="data" [zoomOnHover]="zoomOnHoverOptions"></angular-tag-cloud>
  `
})
export class AppComponent {
  zoomOnHoverOptions: ZoomOnHoverOptions = {
    scale: 1.3, // Elements will become 130 % of current zize on hover
    transitionTime: 1.2, // it will take 1.2 seconds until the zoom level defined in scale property has been reached
    delay: 0.8 // Zoom will take affect after 0.8 seconds
  };

  data: CloudData[] = [
    { text: 'weight-5', weight: 5 }
    { text: 'weight-7', weight: 7 }
    { text: 'weight-9', weight: 9 }
    // ...
  ];
}

Example: Changing Data after initializing

If you want to change the data after initializing it (e.g. when fetching the data from a backend), you have to pass a new CloudData[] into the component so that it can detect the changes:

import { Component } from '@angular/core';
import { CloudData } from 'angular-tag-cloud-module';
import { Observable, of } from 'rxjs';

@Component({
  selector: 'my-component',
  template: `
    <angular-tag-cloud [data]="data"></angular-tag-cloud>
    <button (click)="newData()">Get new Data from Observable</button>
  `
})
export class AppComponent {

  data: CloudData[] = [
    { text: 'Initial Data weight-10', weight: 10 }
    // ...
  ];

  newData(){
    const changedData$: Observable<CloudData[]> = of([
      { text: 'Weight-3', weight: 3 },
      // ...
    ]);
    changedData$.subscribe(res => this.data = res);
  }
}

Example: Detect the clicked item

Angular-Tag-Cloud emits an event as soon as an item is clicked.

import { Component } from '@angular/core';
import { CloudData } from 'angular-tag-cloud-module';

@Component({
  selector: 'my-component',
  template: `
    <angular-tag-cloud
      [data]="data"
      (clicked)="logClicked($event)">
    </angular-tag-cloud>
  `
})
export class AppComponent {

  data: CloudData[] = [
    { text: 'Initial Data weight-10', weight: 10 }
    // ...
  ];

  logClicked(clicked: CloudData){
    console.log(clicked);
  }
}

Example: Using fixed weight values / strict binding of weigth through HTML class

The weight property defines by default the relative importance of the word (such as the number of occurrencies, etc.). The range of values is arbitrary, and they will be linearly mapped to a discrete scale from 1 to 10. This cuases that e.g. passing just one word to the array has the effect that this is relative to other elements. As there aren't any other elements in that case it's result is that the element becomes a container with the class w5 - right in the middle of the discret scale. If you don't want that the tag cloud is calculating the values manually, set the strict property to true and use integer values 1 to 10 within the weight property.

import { Component } from '@angular/core';
import { CloudData } from 'angular-tag-cloud-module';

@Component({
  selector: 'my-component',
  template: `
    <angular-tag-cloud [data]="data" [strict]="true"></angular-tag-cloud>
  `
})
export class AppComponent {

  data: CloudData[] = [
    // HTML-Element will have class 8:
    { text: 'Weight-8', weight: 8 },
    // HTML-Element will have class 10 as 10 is the max. value in strict mode:
    { text: 'Weight-12 -> Weight-10', weight: 12 },
    // HTML-Element will have class 1 as 1 is the min. value in strict mode:
    { text: 'Weight-0 -> Weight-1', weight: 0 },
    // HTML-Element will have class 4 as floats are rounded to an int in strict mode:
    { text: 'Weight-4.3 -> Weight-4', weight: 4.3 },
    // ...
  ];
}

Example: Redraw the cloud

You can trigger the tag cloud to be redrawn by running the method reDraw(). This can be useful if e.g. the boundaries of the upper container are changing and you wanna re-order the words to fit into the container.

import { Component, ViewChild } from '@angular/core';
import { CloudData } from 'angular-tag-cloud-module';
import { TagCloudComponent } from './tag-cloud-module/tag-cloud.component';

@Component({
  selector: 'my-component',
  template: `
    <angular-tag-cloud [data]="data"></angular-tag-cloud>
    <button (click)="reDraw()">Re-draw</button>
  `
})
export class AppComponent {
  @ViewChild(TagCloudComponent) tagCloudComponent: TagCloudComponent;

  data: CloudData[] = [
    { text: 'Weight-8', weight: 8 },
    // ...
  ];

  reDraw() {
    this.tagCloudComponent.reDraw();
  }
}

Using a custom Stylesheet

You can adjust the style for the component. Please read the Wiki article and follow the instructions.

Options

The HTML-selector <angular-tag-cloud> can/must have the following inputs:

Input	Type	default value	mandatory
config	CloudOptions	See other default params	no
data	CloudData[]		yes
width	number (*)	500	no
height	number	300	no
step	number	2.0	no
overflow	boolean	true	no
strict	boolean	false	no
zoomOnHover	ZoomOnHoverOptions	{ scale: 1, transitionTime: 0, delay: 0, color: null }	no
realignOnResize	boolean	false	no
randomizeAngle	boolean	false	no
font	string (CSS font)		no
background	string (CSS background)		no
log	'warn' / 'debug' / false	false	no

(*) if the value is between 0 and 1, it will be set to the size of the upper element multiplied by the value. Setting the value > 1 it will be set the width to the appropriate value in Pixel (px).

data-Array elements can/must have the following attributes:

name	Type	default value	mandatory
text	string	null
weight	number	5	no
link	string		no
external	boolean	false (only has relevance if link was set)	no
color	string (CSS color)	(a shade of blue, depends on the weight)	no
rotate	number	0	no
tooltip	string		no

Also the element can have the following output:

Input	Event Return Type	default value	mandatory	Description
clicked	CloudData	-	no	Returns the clicked CloudData-Object
dataChanges	SimpleChanges from @angular/common	-	no	Returns an SimpleChanges-Object which gives you access to the previous and current values
afterInit	-	-	no	Fires after the View was initilized
afterChecked	-	-	no	Fires after the View was checked

You can also call the method reDraw() to force the cloud data to be re-drawn:

@ViewChild(TagCloudComponent, { static: false }) child: TagCloudComponent;
...
child.redraw();

Development

For development see README.dev.md