How to Restrict Zoom on Mobile Devices in Vue PDF Viewer

14 Aug 20265 minutes to read

Use minZoom and maxZoom to restrict zoom levels on mobile devices and improve scrolling performance and perceived load time. Restricting zoom prevents extreme zoom levels that can degrade rendering performance on constrained devices.

<template>
  <div id="app">
      <ejs-pdfviewer
        id="pdfViewer"
        ref="pdfviewer"
        :documentPath="documentPath"
        :resourceUrl="resourceUrl"
        :documentLoad="documentLoad">
      </ejs-pdfviewer>

  </div>
</template>

<script>
import Vue from 'vue';
import { PdfViewerPlugin, Toolbar, Magnification, Navigation,
         LinkAnnotation, BookmarkView, Annotation, ThumbnailView,
         Print, TextSelection, TextSearch, FormFields, FormDesigner, PageOrganizer } from '@syncfusion/ej2-vue-pdfviewer';
import {Browser} from '@syncfusion/ej2-base';
Vue.use(PdfViewerPlugin);

export default {
  name: 'app',
  data () {
    return {
      documentPath:"https://cdn.syncfusion.com/content/pdf/pdf-succinctly.pdf",
      resourceUrl:"https://cdn.syncfusion.com/ej2/31.2.2/dist/ej2-pdfviewer-lib"
    };
  },
  provide: {
    PdfViewer: [ Toolbar, Magnification, Navigation, LinkAnnotation, BookmarkView, Annotation,
                 ThumbnailView, Print, TextSelection, TextSearch, FormFields, FormDesigner, PageOrganizer ]},

  methods: {
    documentLoad: function (args) {
      const viewer = this.$refs.pdfviewer.ej2Instances;
      if (Browser.isDevice && !viewer.enableDesktopMode) {
        viewer.maxZoom = 200;
        viewer.minZoom = 10;
      }
      else{
          viewer.zoomMode = 'Default';
      }
    }
  }
}
</script>
<template>
  <div id="app">
      <ejs-pdfviewer
        id="pdfViewer"
        ref="pdfviewer"
        :serviceUrl="serviceUrl"
        :documentPath="documentPath"
        :documentLoad="documentLoad">
      </ejs-pdfviewer>

  </div>
</template>

<script>
import Vue from 'vue';
import { PdfViewerPlugin, Toolbar, Magnification, Navigation,
         LinkAnnotation, BookmarkView, Annotation, ThumbnailView,
         Print, TextSelection, TextSearch, FormFields, FormDesigner, PageOrganizer } from '@syncfusion/ej2-vue-pdfviewer';
import {Browser} from '@syncfusion/ej2-base';
Vue.use(PdfViewerPlugin);

export default {
  name: 'app',
  data () {
    return {
      serviceUrl:"https://document.syncfusion.com/web-services/pdf-viewer/api/pdfviewer",
      documentPath:"https://cdn.syncfusion.com/content/pdf/pdf-succinctly.pdf"
    };
  },
  provide: {
    PdfViewer: [ Toolbar, Magnification, Navigation, LinkAnnotation, BookmarkView, Annotation,
                 ThumbnailView, Print, TextSelection, TextSearch, FormFields, FormDesigner, PageOrganizer ]},

  methods: {
    documentLoad: function (args) {
      const viewer = this.$refs.pdfviewer.ej2Instances;
      if (Browser.isDevice && !viewer.enableDesktopMode) {
        viewer.maxZoom = 200;
        viewer.minZoom = 10;
      }
      else{
          viewer.zoomMode = 'Default';
      }
    }
  }
}
</script>

This limits maximum zoom to 200% and minimum zoom to 10% on mobile devices, helping prevent performance issues from excessive zooming.

View sample in GitHub