Angular 6 ng对于按键分组的表列表 [英] Angular 6 ngFor list of tables grouped by key
问题描述
我的Angular 6应用程序需要显示一个表格列表,其中表格是对其组成元素进行的一组化学分析.
My Angular 6 app needs to displays a list of tables, where a table is a group of chemical analyses of elements of its composition.
假设我有金属合金 A .我对其进行了不同的化合物分析,以找到其化学成分:铁:0.001%,铜:0.042%,等等.
Lets say I have a metal alloy A. I perform different compound analyses on it to find its chemical composition: Fe: 0.001%, Cu: 0.042%, etc.
这是我的数据源,它只是带有模拟的打字稿文件
Here is my data source, which is only a typescript file with mocks
import { Certificate } from './certificate';
export const CERTIFICATES: Certificate[] = [
{ serie: '1050 AJ', ident: 'Fe', moy_certified: 0.297 },
{ serie: '1050 AJ', ident: 'Cu', moy_certified: 0.04 },
{ serie: '1050 AJ', ident: 'Mn', moy_certified: 0.0374 },
{ serie: 'X332.0 AC', ident: 'V', moy_certified: 0.019 },
{ serie: 'X4002 AA', ident: 'Mn', moy_certified: 0.037 }
];
我想在使用Angular 6的HTML中在表列表中显示此数据,其中一系列的每个分析都按如下方式分组:
I would like to display this data, in HTML using Angular 6, in a list of tables, where each analyses of a series are grouped like this:
Serie: 1050 AJ
-------------------------
| Element | Composition |
-------------------------
| Fe | 0.0297 |
-------------------------
| Cu | 0.04 |
-------------------------
| Mn | 0.0374 |
Serie: X332.0 AC
-------------------------
| Element | Composition |
-------------------------
| V | 0.019 |
Serie: X332.0 AC
-------------------------
| Element | Composition |
-------------------------
| Mn | 0.037 |
我的HTML文件现在看起来像这样
My HTML file for now looks like this
<ul class="cert-result">
<li *ngFor="let certificate of certificates">
<table>
<tr>
<th>Serie</th>
<th>Element</th>
<th>Composition</th>
</tr>
<tr>
<td>{{certificate.serie}}</td>
<td>{{certificate.ident}}</td>
<td>{{certificate.moy_certifiee}}</td>
</tr>
</table>
</li>
</ul>
显然,这不是正确的方法,因为它为我的数据源的每个元素创建了一个表.
And obviously, this isn't the right way to do it since it makes a table for each elements of my data source.
推荐答案
您必须更改数据结构.
解决方案.
您的数据
export const CERTIFICATES: Certificate[] = [
{ serie: '1050 AJ', ident: 'Fe', moy_certified: 0.297 },
{ serie: '1050 AJ', ident: 'Cu', moy_certified: 0.04 },
{ serie: '1050 AJ', ident: 'Mn', moy_certified: 0.0374 },
{ serie: 'X332.0 AC', ident: 'V', moy_certified: 0.019 },
{ serie: 'X4002 AA', ident: 'Mn', moy_certified: 0.037 }
];
在您的组件中创建一个方法.假设formatedData()
Create a method in your component. let say formatedData()
import { CERTIFICATES } from './certificate';
class AppComponent {
//Todo...
objectKey(obj) {
return Object.keys(obj);
}
formatedCerts() {
return CERTIFICATES.reduce((prev, now) => {
if (!prev[now.serie]) {
prev[now.serie] = [];
}
prev[now.serie].push(now);
return prev;
}, {});
/*
Now your data : { "1050 AJ": [ .... ], "X332.0 AC": [...], ... }
*/
}
}
现在在模板中:
<ul class="cert-result">
<li *ngFor="let key of objectKey(formatedCerts())">
<span>{{key}}</span>
<table>
<tr>
<th>Élément</th>
<th>Moy. Certifiée</th>
</tr>
<tr *ngFor="let certificate of formatedCerts()[key]">
<td>{{certificate.ident}}</td>
<td>{{certificate.moy_certifiee}}</td>
</tr>
</table>
</li>
</ul>
如果要优化,请将formatedCerts()
的数据存储到变量中.
If you want to optimize, store the data of formatedCerts()
into a variable.
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