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(Vue.js) Scrolling in the modal will also scroll the back of the modal

Asked By: Anonymous

Clicking on the image brings up a long, scrolling modal. The problem is that if you scrolling in the modal will also scroll the back of the modal. How do you solve it?

Modal is a component. Here is my code:

Carousel.vue

_x000D_

_x000D_

<template>_x000D_
  <div>_x000D_
    <div v-for="(item, index) in photos" :key="index">_x000D_
      <div @click="imgClick(item)" style="cursor:pointer;">_x000D_
        <img :src="item.thumbnail" />_x000D_
      </div>_x000D_
      <Modal v-if='item.show' @close="item.show = false">_x000D_
        <div slot='body'>_x000D_
          <img :src="item.thumbnail" :class="`img-index--${index}`"/>_x000D_
        </div>        _x000D_
      </Modal>_x000D_
    </div>_x000D_
  </div>_x000D_
</template>_x000D_
_x000D_
<script>_x000D_
import Modal from './Modal.vue'_x000D_
export default {_x000D_
  props: {_x000D_
    items: { type: Array, default: () => [] }_x000D_
  },_x000D_
  data() {_x000D_
    return {_x000D_
      photos: {}_x000D_
    }_x000D_
  },_x000D_
  created() {_x000D_
    this.photos = this.items.map(item => {_x000D_
      return { ...item, show: false }_x000D_
    })_x000D_
  },_x000D_
  methods: {_x000D_
    imgClick(item) {_x000D_
      item.show = true_x000D_
    }_x000D_
  },_x000D_
  components: {_x000D_
    Modal: Modal_x000D_
  }_x000D_
}_x000D_
</script>

_x000D_

_x000D_

x000D


Solution

Answered By: Anonymous

Most modal packages solve this by applying a class to the <body> tag when a modal is opened. For example, <body class="modal-open">. Then in your application’s CSS, you can add this rule:

body.modal-open {
  overflow: hidden;
}

This will make it so that the page behind the modal is no longer scrollable.

Whichever modal package you are using likely fires events when the modal is opened or closed. You can apply this class to the <body> tag in the open event handler, and remove the class from the <body> tag in the close event handler.


UPDATE

Based on the code you added, here’s how you can toggle the modal-open class on the <body> tag:

...

<div @click="showModal(item)" style="cursor:pointer;">
  <img :src="item.thumbnail" />
</div>
<Modal v-if='item.show' @close="hideModal(item)">
  <div slot='body'>
    <img :src="item.thumbnail" :class="`img-index--${index}`"/>
  </div>        
</Modal>

...

{
...

methods: {
  showModal(item) {
    item.show = true
    document.body.classList.add("modal-open");
  },
  hideModal(item) {
    item.show = false;
    document.body.classList.remove("modal-open");
  }
},

...
}

See this jsFiddle for reference.

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