使用angular 2和typescript的svg无法使用* ngFor渲染 [英] Svg using angular 2 and typescript not rendering with *ngFor

问题描述

我正在使用打字稿来玩Angular2，并且有些东西没有如我所希望的那样渲染，我不知道我在做什么错.

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.

此代码有效

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 {
}

但是当我尝试使用* ngFor将其绑定到对象上时，它没有呈现...

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}
    ];
}

我正在尝试遵循本教程(

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 ...

似乎是 AngularJS 2和SVG< ellipse>的副本;元素未呈现

不是每次迭代都生成Dom元素，也不是生成属性(属性)...

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

此问题现已修复 它适用于Chrome，但不适用于IE 11. IE控制台未显示javascript错误，而chrome控制台却未显示.这样一来，我便设法解决了自己遇到的JavaScript错误，从而解决了这个问题.

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.

我原来是更改SystemJS配置的.而不是使用下面所述的配置 https://angular.io/docs/ts/latest/quickstart.html#!#tsconfig

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'
          }
        }
      });

我用过它:

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

这是我不太了解的一部分，这些打字稿选项是否覆盖了tsconfig.json文件?我还不知道...我还不知道此映射是针对什么以及包是什么，但是至少我可以继续学习

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

推荐答案

我是angular2的新手，但这对我有用，也许您必须添加:

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

• directives:[NgFor]

import { NgFor } from 'angular2/common';

对不起，我的英语希望对您有所帮助.

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>`
       
})

更新:

我也尝试过没有

• directives:[NgFor]

import { NgFor } from 'angular2/common';

它有效.

package.json信息

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"
  },
  ..//

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