How to implement the click-to-zoom-in and zoom-out function of images through Vue?

How to implement the click-to-zoom-in and zoom-out function of images through Vue?

In modern web development, clicking to zoom in and out of images is a common requirement. As a popular front-end framework, Vue provides rich functions and concise syntax, which can easily implement this function. This article will introduce how to implement the click-to-zoom-in and zoom-out function of images through Vue, and provide code examples.

First, we need a component that contains multiple pictures. You can use Vue's v-for directive to dynamically render the image list. The following is a simple component example:

<template>
  <div>
    <img class="thumbnail lazy"  src="/static/imghw/default1.png"  data-src="image.src"  v-for="(image, index) in images" :key="index" : 
         @click="toggleModal(index)">
    <Modal :show="modalShow" :image="modalImage" @close="closeModal">
  </div>
</template>

<script>
import Vue from 'vue';
import Modal from './Modal.vue';

export default {
  components: {
    Modal
  },
  data() {
    return {
      images: [
        {src: 'image1.jpg'},
        {src: 'image2.jpg'},
        {src: 'image3.jpg'}
      ],
      modalShow: false,
      modalImage: ''
    }
  },
  methods: {
    toggleModal(index) {
      this.modalImage = this.images[index].src;
      this.modalShow = true;
    },
    closeModal() {
      this.modalShow = false;
    }
  }
}
</script>

In the above code, we use a simple component to implement the image zoom-in and zoom-out function. The component contains a picture list and a modal box component. Each image is bound to the click event @click="toggleModal(index)", and the toggleModal method is triggered when the image is clicked.

The toggleModal method will pass the src of the currently clicked image to modalImage and set modalShow to true to display the modal box. The code of the modal box component Modal is as follows:

<template>
  <div v-if="show" class="modal">
    <span @click="close" class="close">X</span>
    <img  class="modal-image lazy"  src="/static/imghw/default1.png"  data-src="image"  : alt="How to implement the click-to-zoom-in and zoom-out function of images through Vue?" >
  </div>
</template>

<script>
export default {
  props: ['show', 'image'],
  methods: {
    close() {
      this.$emit('close');
    }
  }
}
</script>

<style scoped>
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.8);
  display: flex;
  justify-content: center;
  align-items: center;
}

.modal-image {
  max-width: 80%;
  max-height: 80%;
}

.close {
  position: absolute;
  top: 10px;
  right: 10px;
  cursor: pointer;
  color: #ffffff;
  font-size: 24px;
}
</style>

In the Modal component, we use the props attribute to receive the passed show and image. The modal box contains a close button and an img tag to display the image. When the close button is clicked, the close method is triggered and the close event is passed to the parent component through this.$emit('close').

In the above code, we also added a style to the Modal component to set the style of the modal box.

Finally, in the parent component, we need to add some styles when importing the Modal component:

<style>
.thumbnail {
  width: 100px;
  height: 100px;
  object-fit: cover;
  margin: 10px;
  cursor: pointer;
}
</style>

In the above styles, we set the width and height of the thumbnail, and set the mouse The cursor is a pointer, indicating that it can be clicked.

Through the above code, we can easily realize the click-to-zoom-in and zoom-out function of the image. Just put the image into the component's images array. When the picture is clicked, the toggleModal method will be triggered, the corresponding modal box will be displayed, and the clicked picture will be displayed in the modal box.

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