All geek questions in one place

How to use external Javascript function in Angular 2 template?

I have a template in a component with 4 div tags. The JavaScript function I want to call changeValue()should change the contents of the first div from 1to Yes!. I'm new to TypeScript and Angular 2, so I'm not sure how I can get a template to interact with a function from dtest2.js:

 /**app.component.ts */

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

@Component({
selector: 'my-app',
template: `
  <div id="boolean"><p id="bv">1</p></div>
  <div id="numeric"><p id="nv">2</p></div> 
  <div id="string"><p id="sv">3</p></div> 
  <div id="enum"><p id="ev">4</p></div>
  `
})

export class AppComponent { }


//dtest2.js

function changeValue(){
  var newVal= "Yes!"; 
  document.getElementById("bv").innerHTML= newVal;
}

changeValue();
<html>
  <head>
    <title>Angular 2 QuickStart</title>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="styles.css">

    <!-- Polyfill(s) for older browsers -->
    <script src="node_modules/core-js/client/shim.min.js"></script>

    <script src="node_modules/zone.js/dist/zone.js"></script>
    <script src="node_modules/reflect-metadata/Reflect.js"></script>
    <script src="node_modules/systemjs/dist/system.src.js"></script>
    <script src="file:^html/angular/app/bs.min.js"></script>
    <script src="file:^html/dtest2.js"></script>
    
    <script src="systemjs.config.js"></script>
    <script>
      System.import('app').catch(function(err){ console.error(err); });
    </script>
  </head>

  <body>
    <my-app>Loading...</my-app>
  </body>
</html>
Run code
+4
source share
3 answers

Is there a special reason to use this external js function? It would be better to use Angular binding methods to solve your problem.

/**app.component.ts */

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

declare function changeValues(anyArgs: string, canBeHere: string) : void;

@Component({
selector: 'my-app',
template: `
  <div id="boolean"><p id="bv">{{booleanValue ? 'Yes' : 'No'}}</p></div>
  <div id="numeric"><p id="nv">2</p></div> 
  <div id="string"><p id="sv">3</p></div> 
  <div id="enum"><p id="ev">4</p></div>
  `
})

export class AppComponent {
    booleanValue: boolean = true;

    constructor() { changeValues(...); }

    anyFunctionToChangeTheValue() {
        this.booleanValue = false;
    }
}
+2
source

, Angular 2. Angular2. "window" Angular.

//our root app component
import {Component, NgModule, OnInit} from '@angular/core'
import {BrowserModule} from '@angular/platform-browser'

const window: any = {};

@Component({
selector: 'my-app',
template: `
  <div id="boolean"><p id="bv">1</p></div>
  <div id="numeric"><p id="nv">2</p></div> 
  <div id="string"><p id="sv">3</p></div> 
  <div id="enum"><p id="ev">4</p></div>
  `
})
export class App implements OnInit {
  ngOnInit() {
    changeValue();
  }
}

@NgModule({
  imports: [ BrowserModule ],
  declarations: [ App ],
  bootstrap: [ App ]
})
export class AppModule {}

.

0

You can use:

import { Component,ElementRef } from '@angular/core';
constructor(private elementRef:ElementRef) {};

ngAfterViewInit() {
  var s = document.createElement("script");
  s.type = "text/javascript";
  s.src = "./app/custom.js";
  this.elementRef.nativeElement.appendChild(s);
}
-1
source

Source: https://habr.com/ru/post/1652074/

More articles:


All Articles