ng2-fittext

An Angular 2+ directive, written in pure TypeScript (without jQuery!), to automatically scale the font size of an element so that it fits within its parent container.

Demo

Check out the live demo: ng2-fittext Demo

Installation

Install the library using npm according to your angular version (see table below):

Angular	ng2-fittext	command
<= v17	1.4.3	npm i [email protected]
>= v18	2.0.0	npm i [email protected]

Usage

1. Import the module in your Angular application:

import { Ng2FittextModule } from "ng2-fittext";

@NgModule({
  imports: [Ng2FittextModule]
})

2. Use the directive in your components:

import { Component } from '@angular/core';

@Component({
  selector: 'label',
  template: `
    <div #container>
      <div [fittext]="true" [activateOnResize]="true" [container]="container">Bla bla bla...</div>
    </div>
  `
})
export class LabelComponent {}

Examples

Fit to the parent element (works if you have a variable number of elements between your element and its parent):

import { Component } from '@angular/core';

@Component({
  selector: 'label',
  template: `
    <div>
      <div [fittext]="true" [activateOnResize]="true">Bla bla bla...</div>
    </div>
  `
})
export class LabelComponent {}

NEW! Support for auto-resize input box:

import { Component } from '@angular/core';

@Component({
  selector: 'inputbox',
  template: `
    <div #container>
      <input [fittext]="true" [activateOnResize]="true" [container]="container" [activateOnInputEvents]="true">
    </div>
  `
})
export class InputBoxComponent {}

NEW! Support for maxFontSize:

import { Component } from '@angular/core';

@Component({
  selector: 'inputbox',
  template: `
    <div>
      <input [fittext]="true" [activateOnResize]="true" [activateOnInputEvents]="true" [minFontSize]="40" [maxFontSize]="100">
    </div>
  `
})
export class InputBoxComponent {}

Input Parameters:

Parameter	Description	Values
fittext	Directive selector	true/false
container	The container to fit (if not present it fits to the parent container by default)	ElementRef
activateOnResize	Enable/disable the autofit on window resize	true or false (default false)
activateOnInputEvents	Enable/disable the auto-fit in case of input box events (keydown, keyup etc..)	true or false (default false)
maxFontSize	Maximum font size	Number (default is 1000)
!deprecated! useMaxFontSize	Use max font size if is true	Deprecated!
minFontSize	Minimum font size	Number (default is 7)
modelToWatch	Pass model to watch; when this model changes, font size is automatically recalculated	Any type of model

Output Parameters:

Parameter	Description	Values
fontSizeChanged	Current font size	string

Development

Want to contribute? Great! Simply, clone the repository!

I created this library because I always spent too much time solving this problem and didn't find anything on the web (as of 13/03/2017) that does this without jQuery and is easily integrable in Angular 2+. While it might not be the best implementation, it gets the job done.

Todos

• Write tests
• Find a performant algorithm to find the font size that fits the container better

License

MIT

Lorenzo I.