图像更改灰度(滑块)的角度

问题描述

我正在尝试使用滑块控件将图像更改为灰度和棕褐色

I am trying to change image into Greyscale and Sepia using slider control

这是我的html代码

       <div class="card-body">
        <input id="sepia" type="range" oninput="set(this, 'sepia');" value="0" step="0.1" min="0" max="1"> Sepia <span id="Amount_sepia">(0)</span><br/>
        <input id="grayscale" type="range" oninput="set(this, 'grayscale');" value="0" step="0.1" min="0" max="1"> Grayscale <span id="Amount_grayscale">(0)</span><br/>
      </div>

              <img class="img-fluid" id="img_prev" src="{{actualImage}}" *ngIf="!this.showCropper" />
                <image-cropper id="img_prev"  class="imageclass" *ngIf="this.showCropper"
                        [autoCrop]="false"
                          [imageChangedEvent]="imageChangedEvent"
                           [maintainAspectRatio]="true"
                           [aspectRatio]="4 / 3"
                           [resizeToWidth]="256"
                           [cropperMinWidth]="128"
                            [onlyScaleDown]="true"
                           format="png"
                           (imageCropped)="imageCropped($event)"
                           (imageLoaded)="imageLoaded()"
                           (cropperReady)="cropperReady()"
                           (loadImageFailed)="loadImageFailed()" style="max-height:500px">
                </image-cropper>

这是我的同情

public set(e,f){
    document.getElementById('img_prev').style["filter"] = f+"("+e.value+")";
    document.getElementById('Amount_'+f).innerHTML="("+e.value+")";
 }

我遇到错误

(index):13 Uncaught ReferenceError: set is not defined
at HTMLInputElement.oninput ((index):13)

推荐答案

为什么不使用角度方式"?

why not use an "Angular way"?

您声明两个变量

  sepia=0;
  grayScale=0;

只需使用 [(ngModel)] 和 [style.filter]

<input id="sepia" type="range" [(ngModel)]="sepia"
    step="0.1" min="0" max="1"> Sepia
    <span id="Amount_sepia">({{sepia}})</span>
<br/>
<input id="grayscale" type="range" [(ngModel)]="grayScale"
    step="0.1" min="0" max="1"> Grayscale
<span id="Amount_grayscale">({{grayScale}})</span>
<br/>
<img [style.filter]="'grayscale('+grayScale+') sepia('+sepia+')'"
    src="https://picsum.photos/300/300?random=1">

请参见简单的stackblitz

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