Svg using angular 2 and typescript not rendering w

Question

I'm playing around with Angular2, using typescript and there is something that is not rendering as I hoped for, I don't know what I'm doing wrong.

This code is working

import {Component} from 'angular2/core';

@Component({
    selector: 'my-app',
    template: `
        <svg viewBox="0 0 900 500" preserveAspectRatio="xMidYMid meet">
            <svg:circle cx=50 cy=50 r=10 />
            <svg:circle cx=71 cy=71 r=20 />
            <svg:circle cx=106 cy=106 r=30 />
        </svg>
    `
})
export class AppComponent {
}

But when I'm trying to bind it on an object with *ngFor, it's not rendering...

@Component({
    selector: 'my-app',
    template: `
        <svg viewBox="0 0 900 500" preserveAspectRatio="xMidYMid meet">
            <svg:circle *ngFor="#circle of circles"
                  [attr.cx]="circle.x"
                  [attr.cy]="circle.y"
                  [attr.r]="circle.radius" />
        </svg>
    `
})
export class AppComponent {
    circles = [
        {x: 50, y: 50, radius: 10},
        {x: 75, y: 75, radius: 20},
        {x: 115, y: 115, radius: 30}
    ];
}

I'm trying to follow this tutorial (http://teropa.info/blog/2016/02/28/metabubbles-generative-art-with-angular-2.html#drawing-svg-circles) using typescript instead ...

---

Seems to be a duplicate of AngularJS 2 and SVG <ellipse> elements not rendered

Dom elements not generated for every iteration and properties(attributes) not generated...

---

THIS IS NOW FIXED It works in Chrome, but not in IE 11. IE Console was not displaying the javascript errors and chrome console was. That how I managed to fix my issue trying to solve the javascript errors I had.

I turned out to change the SystemJS config. Instead of using the following config as stated there https://angular.io/docs/ts/latest/quickstart.html#!#tsconfig

System.config({
        packages: {        
          app: {
            format: 'register',
            defaultExtension: 'js'
          }
        }
      });

I used it :

System.config({
    transpiler: 'typescript',
    typescriptOptions: {
        emitDecoratorMetadata: true
    },
    map: {
        app: "./app"
    },
    packages: {
        app: {
            main: './main',
            defaultExtension: 'js'
        }
    }
});

That's one part I'm not understanding very well, are those typescriptoptions are overrideing tsconfig.json file? I don't know yet... I don't know yet what is this mapping for and what are the packages, but at least I can go on with my learning

Answer 1

you can try this.

defining your circle component

@Component({
    selector: 'g[circle]',
    templateUrl: './circle.component.html',
    styleUrls: ['./circle.component.scss']
})

circle.component.hmtl :

<svg:circle
            [attr.cx]="circle?.x" 
            [attr.cy]="circle?.y" 
            [attr.r]="radius" 

            [attr.fill]="circle?.fill"
             />

and your root html will be like

<svg>
<g circle *ngFor="let circle of circles" 
                    [attr.fill-opacity]="opacity" 
                    [attr.transform]="scale" 
                    [circle]="circle"
                     />
</svg>

similarly you can use all the other svg shapes by creating similar components with selector as defied above.

You can use this library which provides all the svg elements

https://www.npmjs.com/package/angular-svg

Answer 2

I'm new to angular2 but this works for me, maybe you have to add:

• directives:[NgFor]

• import { NgFor } from 'angular2/common';

sorry for my English hope it will help you.

import { Component } from 'angular2/core';
import { NgFor } from 'angular2/common
..//
@Component({
    selector: 'test',
    directives:[NgFor],
    template: `
               <svg viewBox="0 0 900 500" preserveAspectRatio="xMidYMid meet">
                    <svg:circle *ngFor="#circle of circles"
                        [attr.cx]="circle.x"
                        [attr.cy]="circle.y"
                        [attr.r]="circle.radius" />
                   </svg>`

})

Update:

I have also tried without

• directives:[NgFor]

• import { NgFor } from 'angular2/common';

  and it works.

---

package.json info

..//
"license": "ISC",
  "dependencies": {
    "angular2": "2.0.0-beta.7",
    "systemjs": "0.19.22",
    "es6-promise": "^3.0.2",
    "es6-shim": "^0.33.3",
    "reflect-metadata": "0.1.2",
    "rxjs": "5.0.0-beta.2",
    "zone.js": "0.5.15"
  },
  ..//