如何使Mathjax与Angular2一起使用?

问题描述：

有人让Mathjax与Angular2合作吗?

Has anyone gotten Mathjax working with Angular2 ?

Plunkr示例:- http://plnkr.co/edit/FLduwmtHfkCN5XPfzMsA?p=preview

Plunkr example created :- http://plnkr.co/edit/FLduwmtHfkCN5XPfzMsA?p=preview

从一些Angular1示例中，我看到似乎需要一个指令来调用MathJax.Hub.Queue，但是我怀疑要花很长时间才能正确使用Angular 2语法，所以我想知道是否有人已经做过它吗?

From some Angular1 examples I saw it looks like a directive is needed to call MathJax.Hub.Queue, but I suspect it will take me quite a while to get the Angular 2 syntax right, so I wondered if anyone has already done it ?

例如，以下是Angular 1示例. https://github.com/ColCarroll/ngMathJax/blob/master/ng -mathjax.js

e.g the following is an Angular 1 example. https://github.com/ColCarroll/ngMathJax/blob/master/ng-mathjax.js

mathjax语法在这里:- https://docs.mathjax.org/en/v1.1-latest /typeset.html

And the mathjax syntax is here :- https://docs.mathjax.org/en/v1.1-latest/typeset.html

试图在Angular2中做类似的事情.

Trying to do something similar in Angular2.

更新-感谢蒂埃里(Thierry)，以下工作得以实现.

UPDATE - the following works, thanks to Thierry.

组件:-

import {Component, OnInit} from 'angular2/core';
import {MathJaxDirective} from './mathjax.directive';

@Component({
  selector: 'hello-mathjax',
  templateUrl: 'app/hello_mathjax.html',
  directives: [MathJaxDirective]
})
export class HelloMathjax {
  fractionString: string = 'Inside Angular one half = $\\frac 12$';
  index: number = 3;

    ngOnInit() {
        MathJax.Hub.Queue(["Typeset",MathJax.Hub,"MathJax"]);
    }

    update () {
      this.fractionString = 'Inside Angular one third = $\\frac 1'+this.index+'$';
      this.index++;
    }

}

指令:-

import {Directive, ElementRef, Input} from 'angular2/core';
@Directive({
    selector: '[MathJax]'
})
export class MathJaxDirective {
    @Input('MathJax') fractionString: string;

    constructor(private el: ElementRef) {
    }

    ngOnChanges() {
      console.log('>> ngOnChanges');
       this.el.nativeElement.style.backgroundColor = 'yellow';
       this.el.nativeElement.innerHTML = this.fractionString;
       MathJax.Hub.Queue(["Typeset",MathJax.Hub, this.el.nativeElement]);
    }
}

仍然不确定为什么我需要在两个地方都排队重新渲染.

Still not sure why I need to queue the re-render in both places.

答

我将通过输入来实现此方式以获取指定的表达式:

I would implement this way with an input to get the specified expression:

import {Directive, ElementRef, Input} from 'angular2/core';
@Directive({
    selector: '[MathJax]'
})
export class MathJaxDirective {
    @Input(' MathJax')
    texExpression:string;

    constructor(private el: ElementRef) {
    }

    ngOnChanges() {
       this.el.nativeElement.innerHTML = this.texExpression;
       MathJax.Hub.Queue(["Typeset", MathJax.Hub, this.el.nativeElement]);
    }
}

并使用这种方式:

<textarea #txt></textarea>
<span [MathJax]="txt.value"></span>

请参阅以下示例: http://plnkr.co/edit/qBRAIxR27zK3bpo6QipY?p=preview .

如何使Mathjax与Angular2一起使用?

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