webview-screenshot-comparison.uvue

<template>
  <web-view id="webview-screenshot" class="webview-screenshot" :src="src" @loaded="loaded" @error="error">
  </web-view>
  <text style="display: none"></text>
</template>

<script>
  export default {
    data() {
      return {
        baseSrc: '',
        src: '',
        webviewContext: null as WebviewContext | null,
        isLoaded: false,
        needRemoveWebHead: false,
      }
    },
    onReady() {
      this.webviewContext = uni.createWebviewContext('webview-screenshot', this)
    },
    methods: {
      removeWebHead() {
        this.webviewContext?.evalJS(`document.querySelector('uni-page-head').style.display='none'`);
      },
      appendWebHeadPlaceholder() {
        this.webviewContext?.evalJS(`
  const hasWebHeadPlaceholder = document.querySelector('.web-head-placeholder-for-screenshot-comparison');
  if (hasWebHeadPlaceholder) {
    return;
  }
  const webHeadPlaceholder = document.createElement('div');
  webHeadPlaceholder.style.height = '52px';
  webHeadPlaceholder.style.backgroundColor = '#007aff';
  webHeadPlaceholder.classList.add('web-head-placeholder-for-screenshot-comparison');
  const uniPage = document.querySelector('uni-page');
  const uniPageHead = document.querySelector('uni-page-head');
  uniPage.insertBefore(webHeadPlaceholder, uniPageHead);
  `);
      },
      loaded() {
        this.isLoaded = true
        if (this.needRemoveWebHead) {
          this.removeWebHead();
        } else {
          this.appendWebHeadPlaceholder();
        }
      },
      error(event : WebViewErrorEvent) {
        console.log('webview load error', JSON.stringify(event.detail));
      }
    }
  }
</script>
<style>
  .webview-screenshot {
    flex: 1;
  }
</style>