Angular2渲染器：渲染了Svg rect但未在页面中显示 [英] Angular2 Renderer: Svg rect is rendered but not showing in page

问题描述

我想用SVG创建一个条形图，矩形作为条形。

I want to create a bar chart using SVG with rect as the bar.

相关代码如下：

barchart-one.html

barchart-one.html

   <svg #svgone width="400" height="250" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 400 250">
    <g #abcd></g>
</svg>

barchart-one.ts

barchart-one.ts

 import { Component, Renderer2, ViewChild, ElementRef } from '@angular/core';

    @Component({
    selector: 'barchart-one',
    templateUrl: 'barchart-one.html'
    })
    export class BarchartOneComponent {
    @ViewChild('abcd') 
    private abcd: ElementRef;  
    constructor(private renderer: Renderer2) {}

    ngAfterViewInit() {
        for (var i = 1; i < 8; i++) {
            let height = Math.floor(Math.random() * (140 - 110)) + 110;
            const rect = this.renderer.createElement('rect');
            this.renderer.setAttribute(rect, 'height', height);
            this.renderer.setAttribute(rect, 'rx', '6');
            this.renderer.setAttribute(rect, 'ry', '6');
            this.renderer.setAttribute(rect, 'width', '12');
            this.renderer.setAttribute(rect, 'x', (i*50)+20);
            this.renderer.setAttribute(rect, 'y', (220-height));
            this.renderer.appendChild(this.abcd.nativeElement, rect);
            console.log(rect);
        };
    }
    }

svg渲染结果：

<g>


<rect height="126" rx="6" ry="6" width="12" x="70" y="94"></rect>
<rect height="122" rx="6" ry="6" width="12" x="120" y="98"></rect>
<rect height="124" rx="6" ry="6" width="12" x="170" y="96"></rect>
<rect height="116" rx="6" ry="6" width="12" x="220" y="104"></rect>
<rect height="139" rx="6" ry="6" width="12" x="270" y="81"></rect>
<rect height="123" rx="6" ry="6" width="12" x="320" y="97"></rect>
<rect height="137" rx="6" ry="6" width="12" x="370" y="83"></rect>
</g>

即使正确呈现了rect的代码，预期结果也不会显示在页面中。

The expected result is not showing in page even though the code for rect is correctly rendered.

推荐答案

您无法使用createElement创建SVG元素，您必须使用createElementNS并传递SVG名称空间，即 http://www.w3.org/2000/svg 作为第一个参数。

You cannot create SVG elements with createElement, you must use createElementNS and pass the SVG namespace i.e. http://www.w3.org/2000/svg as the first parameter.

this.renderer.createElementNS('http://www.w3.org/2000/svg', 'rect');

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