Angular 2 typescript调用javascript函数

时间:2016-05-20 13:36:04

标签: javascript angular typescript

是否有正确的方法从Angular 2(TypeScript)中的组件调用JavaScript函数?

这是我的组件:

import { ElementRef, AfterViewInit }       from '@angular/core';

export class AppComponent implements AfterViewInit {

    constructor(private _elementRef: ElementRef) {
    }

    ngAfterViewInit() {
        /**
         * Works but i have this error :
         * src/app.component.ts(68,9): error TS2304: Cannot find name 'MYTHEME'.
         * src/app.component.ts(69,9): error TS2304: Cannot find name 'MYTHEME'.
         */
        MYTHEME.documentOnLoad.init(); 
        MYTHEME.documentOnReady.init();

        /**
         * Works without error, but doesn't seem like a right way to do it
         */
        var s = document.createElement("script");
        s.text = "MYTHEME.documentOnLoad.init(); MYTHEME.documentOnReady.init();";
        this._elementRef.nativeElement.appendChild(s);
    }
}

直接调用JavaScript函数会导致编译错误,但“已编译”的JavaScript文件(app.component.js)中的语法是正确的:

AppComponent.prototype.ngAfterViewInit = function () {
    MYTHEME.documentOnLoad.init();
    MYTHEME.documentOnReady.init();
};

第二种方式(appendChild)可以正常工作,但我不认为(从typescript / angular更改DOM)是正确的方法。

我发现了这个:Using a Javascript Function from Typescript我尝试声明界面:

interface MYTHEME {
    documentOnLoad: Function;
    documentOnReady: Function;
}

但TypeScript似乎无法识别它(接口声明中没有错误)。

由于

编辑:

在Juan Mendes的回答之后,这就是我的结局:

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

interface MYTHEME {
    documentOnLoad: INIT;
    documentOnReady: INIT;
}
interface INIT {
    init: Function;
}
declare var MYTHEME: MYTHEME;

export class AppComponent implements AfterViewInit {

    constructor() {
    }

    ngAfterViewInit() {
        MYTHEME.documentOnLoad.init(); 
        MYTHEME.documentOnReady.init();
    }
}

1 个答案:

答案 0 :(得分:7)

您必须使用declare告诉TypeScript有关外部(JavaScript)声明的信息。见https://www.typescriptlang.org/docs/handbook/writing-declaration-files.html

interface MyTheme {
    documentOnLoad: Function;
    documentOnReady: Function;
}
declare var MYTHEME: MyTheme;

或匿名

declare var MYTHEME: {documentOnLoad: Function, documentOnReady: Function};