angular css

Hi, everyone. In this article, I’ll explain several problems that I used to find every time I had to do something with a visual component in Angular and D3.

嗨，大家好。 在本文中，我将解释每次不得不对Angular和D3中的可视化组件进行操作时都会发现的几个问题。

Just to enlighten you, I’ll use a line chart graph based on this example:

为了启发您，我将基于此示例使用折线图：

It’s nothing too complicated — it’s just for creating something basic like a line chart with random data.

没什么太复杂-只是用于创建折线图之类的基本内容 与随机数据。

问题 (The Problem)

There are so many ways to initialise a chart in D3 with Angular, so it can be a problem. Surely, if you did more than three D3 visual components in Angular, you’ve done them in a different way each time.

使用Angular在D3中初始化图表的方法有很多，因此可能是个问题。 当然，如果您在Angular中执行了三个以上的D3视觉组件，则每次都以不同的方式进行了处理。

Let me explain a good way to adjust your charts.

让我解释一下调整图表的好方法。

But for the very first step, I’m going to present the instructions to create a new project with Angular and D3.

但首先，我将介绍使用Angular和D3创建新项目的说明。

创建Angular项目 (Creating the Angular project)

Use the Angular CLI to quickly set one up:

使用Angular CLI快速设置：

$ npm install -g @angular/cli

Then start a new project:

然后开始一个新项目：

$ ng new ng-d3-css-example$ cd ng-d3-css-example

整合D3 (Integrating D3)

Its typings in TypeScript:

它在TypeScript中的类型：

$ npm install d3 --save$ npm install @types/d3 --save-dev

生成组件 (Generate the component)

Let’s create a component.

让我们创建一个组件。

$ ng generate component line-chart

模板 (Template)

The point here is that for every visual component in D3, I use this code. I love it because it’s only one tag with svg, a class, and an identifier to retrieve it later. That’s it!

这里的要点是，对于D3中的每个可视组件，我都使用此代码。 我喜欢它，因为它只是svg的一个标记，一个class和一个标识符，以后可以检索它。 而已！

<svg #chart class="chart"></svg>

样式 (Style)

The focus here is the .chart class — it allows us to adjust our chart via CSS. It completely separates how we’re sizing charts from other parts, and it’s done only through the style.

这里的焦点是.chart类-它允许我们通过CSS调整图表。 它完全将我们如何将图表的大小与其他部分分开，并且仅通过样式来完成。

line-chart.component.scss

line-chart.component.scss

....chart { width: 240px; height: 230px; ...

控制者 (Controller)

Have a quick look at the controller — all the magic is in there. Then, I’m going to comment on just a few things.

快速浏览一下控制器-所有的魔力都在那里。 然后，我将仅对几件事发表评论。

Our controller, where the magic happens. See below for an explanation. 我们的控制器，魔术发生的地方。 请参阅下面的说明。

Obviously, importing D3:

显然，导入D3：

line-chart.component.ts

line-chart.component.ts

import * as d3 from "d3";

Another task would be retrieving, via @ViewChild, the component itself for adding properties that are always present in all of our visual components.

另一个任务是通过@ViewChild检索组件本身，以添加在我们所有可视组件中始终存在的属性。

line-chart.component.ts

line-chart.component.ts

@ViewChild("chart", { static: true }) protected chartContainer: ElementRef; svg: any; g: any; tooltip: any; margin: {top:number; right:number; bottom: number; left: number;}; contentWidth: number; contentHeight: number; width: number; height: number;

All of these properties must be initialised. In fact, we can do it in an ngOnInit cycle of Angular, as we already have everything.

所有这些属性都必须初始化。 实际上，我们可以在ngOnInit做到这ngOnInit Angular的周期，因为我们已经拥有了一切。

line-chart.component.ts

line-chart.component.ts

initChart() { const element = this.chartContainer.nativeElement; this.svg = d3.select(element); this.margin = { top: +this.svg.style("margin-top").replace("px", ""), right: +this.svg.style("margin-right").replace("px", ""), bottom: +this.svg.style("margin-bottom").replace("px", ""), left: +this.svg.style("margin-left").replace("px", "") };this.width = +this.svg.style("width").replace("px", ""); this.height = +this.svg.style("height").replace("px", ""); this.contentWidth = this.width - this.margin.left - this.margin.right; this.contentHeight = this.height - this.margin.top - this.margin.bottom; this.g = this.svg.append("g").attr("transform", "translate(" + this.margin.left + "," + this.margin.top + ")"); } Putting some margins, etc. to delimitate the content a little bit is almost always mandatory in D3

在D3中几乎总是强制使用一些边距等来分隔内容

We’re converting width and height into a numeric value, and it’s the key concept here

我们正在将width和height转换为数值， 这是这里的关键概念

Indeed, even if you put %, vw, vh, or another measure in your style, it’ll still be set correctly

实际上，即使您在样式中放入% ， vw ， vh或其他度量，它也仍会正确设置

结果 (Result)

After the CSS properties like width and height are set, you’ll be able to check them.

设置CSS属性(例如width和height ，就可以对其进行检查。

$ npm start Remember, before we put ‘width: 240px; height: 230px;’ 请记住，在我们输入“ width：240px; 高度：230像素；'

And now, see it’s modified via CSS when I change for this:

现在，当我对此进行更改时，可以通过CSS对其进行修改：

.chart { //width: 240px; //height: 230px; width: 100%; height: 100%;... ’%’? Yes, as I said before, they’re magically captured from CSS and converted to a numeric. '％'一起使用吗？ 是的，正如我之前说过的那样，它们是从CSS中神奇地捕获并转换为数字的。

D3 is going to set up the width as a numeric. However, before it was retrieved from CSS as the maximum size of 100% (the width attribute in the .chart class).

D3将宽度设置为数字。 但是，在从CSS检索到它之前，最大大小为100％(。 .chart类中的width属性)。

Screenshot to see how it was converted to a numeric automatically 屏幕截图，了解如何将其自动转换为数字

Finally, you won’t need to adjust your charts anymore in other parts either — not in your templates or in your controllers.

最后，您无需再调整其他部分的图表，也不需要调整模板或控制器中的图表。

Repo at this point ( StackBlitz or GitHub on branch develop) 此时回购( 分支开发上的 StackBlitz 或 GitHub )

结论 (Conclusion)

It gave me a headache any time I had to build a chart with Angular and D3. Now, I think from my experience and knowledge, I’ve found a good way to at least initialise them.

每当我不得不使用Angular和D3绘制图表时，这都让我头疼。 现在，我认为根据我的经验和知识，我找到了一种至少将它们初始化的好方法。

I hope you enjoyed, and I hope you learned a new way to adjust charts. Thanks for reading.

希望您喜欢，也希望您学习调整图表的新方法。 谢谢阅读。

翻译自: https://medium.com/better-programming/angular-d3js-a-better-pattern-for-adjusting-charts-via-css-646992231901

angular css

相关资源：angular-chart：AngularJS指令，用于可调整的动态更新c3图表-源码