Angular 7获取关键字列表的google搜索结果计数

Question

EDITED

我的CSVRecord类型如下：

  export class CSVRecord {
    public id: any;
    public pubversion: any;
    public guid: any;
    public keywords: any;
    public seometriccount: any;
  }

我正在尝试从csv中读取值并将其显示在td中，我可以从下面的代码中实现。

app.component.html

<input type="file" #csvReader name="Upload CSV" id="txtFileUpload" (change)="uploadListener($event)" accept=".csv" />
<table class="minimalistBlack" *ngIf="records.length > 0">
    <thead>
        <tr>
            <th>ID </th>
            <th>Pub version </th>
            <th>GUID </th>
            <th>Keywords </th>
            <th>SEO Metric count </th>
        </tr>
    </thead>
    <tbody>
        <tr *ngFor="let record of records; let i = index;">
            <td> <span>{{record.id}}</span> </td>
            <td> <span>{{record.pubversion}}</span> </td>
            <td> <span>{{record.guid}}</span> </td>
            <td> <span>{{ record.keywords }}</span> </td>
            <td> <span>{{ record.seometriccount }}</span> </td>
        </tr>
    </tbody>
</table>

app.component.ts

import { Component, ViewChild } from '@angular/core';
import { CSVRecord } from './CSVModel';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})

export class AppComponent {
  title = 'Angular7-readCSV';

  public records: any[] = [];
  @ViewChild('csvReader') csvReader: any;

  uploadListener($event: any): void {

    let text = [];
    let files = $event.srcElement.files;

    if (this.isValidCSVFile(files[0])) {

      let input = $event.target;
      let reader = new FileReader();
      reader.readAsText(input.files[0]);

      reader.onload = () => {
        let csvData = reader.result;
        console.log(csvData);
        let csvRecordsArray = (<string>csvData).split(/\r\n|\n/);

        let headersRow = this.getHeaderArray(csvRecordsArray);

        this.records = this.getDataRecordsArrayFromCSVFile(csvRecordsArray, headersRow.length);
      };

      reader.onerror = function () {
        console.log('error is occured while reading file!');
      };

    } else {
      alert("Please import valid .csv file.");
      this.fileReset();
    }
  }

  getDataRecordsArrayFromCSVFile(csvRecordsArray: any, headerLength: any) {
    let csvArr = [];

    for (let i = 1; i < csvRecordsArray.length; i++) {
      let curruntRecord = (<string>csvRecordsArray[i]).split(',');
      if (curruntRecord.length == headerLength) {
        let csvRecord: CSVRecord = new CSVRecord();
        csvRecord.id = curruntRecord[0].trim();
        csvRecord.pubversion = curruntRecord[1].trim();
        csvRecord.guid = curruntRecord[2].trim();
        csvRecord.keywords = curruntRecord[3].trim();
        csvRecord.seometriccount = curruntRecord[4];
        csvArr.push(csvRecord);

      }
    }
    return csvArr;
  }

  isValidCSVFile(file: any) {
    return file.name.endsWith(".csv");
  }

  getHeaderArray(csvRecordsArr: any) {
    let headers = (<string>csvRecordsArr[0]).split(',');
    let headerArray = [];
    for (let j = 0; j < headers.length; j++) {
      headerArray.push(headers[j]);
    }
    return headerArray;
  }

  fileReset() {
    this.csvReader.nativeElement.value = "";
    this.records = [];
  }
}

输出：

现在，我需要使用关键字（在上一列中）在输出的最后一列中显示google搜索结果计数。

例如：如果我的Keywords列中包含-亚马逊，Firestick，bla bla ..等关键字，那么我的脚本应在google中搜索这些关键字并显示第1页的结果计数。

在第1页上说，它有5个结果，应该显示5。

1）我该如何实现？ -可以使用Angular完成吗？

2）请用代码解释，因为我是角度7的新手

Answer 1

首先，您要实现的目标根本不是用户友好的。只是要记住，每次在模型或UI中进行更改时，angular都会尝试绑定单元格（我不确定，但是有时即使滚动页面，它也会尝试重新绘制UI，因此需要缓存结果，否则，您将不断向Google提出请求，这可能会导致您的客户端IP地址获得验证码，并且没有结果返回给您）

所以要尽量减少影响：

使用html：

  <td> <span>{{ GetResultFromGoogle(record) }}</span> </td>

以Ts：

    public GetResultFromGoogle(record:CSVRecord ):number {

    if(!record.seometriccount)
    {
    // search google for result and get what you want, answering to this part, is for another quesiton
        this.httpClient.get(googleUrl, neededParamsForSearch).subscribe( data=>{
        //extract result by Xpath  and set to your record
         return record.seometriccount = resultCount;
        });

    }
    else
        return record.seometriccount;

    }