带输入文件的Angular 4/5材质凸起按钮 [英] Angular 4/5 material raised button with input file

问题描述

我正在开发一个有角度的应用程序，目前正在上传我正在使用的文件:

I am working on a angular application, currently to upload a file I am using this :

<label class="btn btn-default">
    <input type="file" (change)="selectFile($event)">
</label>
<button class="btn btn-success" [disabled]="!selectedFiles"
    (click)="upload()">Upload</button>

在.ts文件中具有方法，效果很好.

with methods on my .ts file, it is working well.

我现在想将其升级为像这样的实质性的角度组件凸起按钮:

I want to upgrade this to material angular components raised button like that right now :

<button mat-raised-button>
    <input type="file" (change)="selectFile($event)">
</button>

<button mat-button disabled [disabled]="!selectedFiles" (click)="upload()">Upload</button>

disabled按钮效果很好，但是输入文件部分不起作用，打印错误，并且没有打开文件夹搜索窗口.有什么想法吗?

the disabled button is doing well but the input file part doesnt work , it prints baddly and does not open a file folder search window. any ideas?

推荐答案

建议不要在按钮内使用输入字段，最好先隐藏文件输入，然后再隐藏按钮以触发它.下面的示例将显示它的一个最小示例.

Won't advise using input field within a button, better you hide the file input and then a button to trigger it. The below example will show a minimal example of it

@Component({
  selector: 'my-app',
  template: `
    <div>
      <h2>Hello {{name}} is for Uploading</h2>
    </div>

    <button mat-raised-button (click)="openInput()">
        Select File to Upload
    </button>

<input id="fileInput" hidden type="file" (change)="fileChange($event.target.files)" >

<button mat-button [disabled]="!ourFile" (click)="upload()">Upload</button>

  `
})
export class App {
  name:string;
  ourFile: File; // hold our file

  constructor() {
    this.name = `Angular! v${VERSION.full}`
  }

  /**
   * this is used to trigger the input
   */ 
  openInput(){ 
    // your can use ElementRef for this later
    document.getElementById("fileInput").click();
  }

  fileChange(files: File[]) {
    if (files.length > 0) {
      this.ourFile = files[0];
    }
  }


   /**
   * this is used to perform the actual upload
   */
   upload() {
    console.log('sending this to server', this.ourFile);
  }


}

选中此 plnk

在上面的示例中，您应该能够在不影响HTML语义的情况下对按钮进行样式设置

With the above example, you should be able to style your button without distorting HTML semantics

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