Angular-读取文件并解析其内容 [英] Angular - Read a file and parse its content

问题描述

我具有文件上传控件，该控件可按如下方式保存所选文件，

I have file upload control which holds the selected file as below,

<div class="Block">
  <label id="lbl">File </label>
  <input #fileInput type='file'/>
</div>

我有一个提交按钮，如下所示，

I have a submit button as below,

<button type="button" class="btn btn-primary" 
     (click)="uploadDocument()">Upload File</button>

当我选择一个文件并单击上载按钮时，我需要文件中的内容，而无需将其发送到服务器并从那里读取.

When I select a file and click on the upload button the file I need the contents inside the file without sending it to the server and reading from there.

注意:文件类型为csv

推荐答案

您可以在javascript中使用FileReader作为其csv文件

You can use FileReader in javascript to achieve this as its a csv file

添加文件更改事件以将文件存储在如下所示的对象中，

Add a file change event to store the file in a object as below,

<div class="Block">
  <label id="lbl">Code </label>
  <input type='file' (change)="fileChanged($event)">

</div>

该功能应将文件设置为稍后使用的对象

The function should set the file to an object which is used later

file:any;
fileChanged(e) {
    this.file = e.target.files[0];
}

单击提交按钮后，您可以在javascript中使用FileReader的readAsText()方法来获取如下内容，

When the submit button is clicked you can use the readAsText() method of FileReader in javascript to get the content as below,

uploadDocument(file) {
    let fileReader = new FileReader();
    fileReader.onload = (e) => {
      console.log(fileReader.result);
    }
    fileReader.readAsText(this.file);
}

注意:读取内容后将触发onload事件，因此您的逻辑应放在onLoad函数中.

Note: onload event will be fired after the content is read so your logic should be inside the onLoad function.

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