Using v-bind:src with Vue

You can dynamically control the image an <img> tag displays using the v-bind:src, or :src for short, binding. This allows you to insert JavaScript in the attribute field.

methods

Using :src, you can set the image's src to the result of a Vue method.

<script>
  const { createApp } = Vue

  createApp({
    methods: {
      getPhoto() {
        return '../../assets/logo.png';
      }
    },
    template: `
    <img :src="getPhoto()" />
    `
  }).mount('#app');
</script>

computed

A computed property allows you to have logic that is dependent on reactive data. In the example below, should value change, the logo image will no longer be displayed.

<div id="example"></div>

<script>
  const { createApp } = Vue

  createApp({
    data: function() {
      return {
        value: 0
      }
    },
    computed: {
        photo() {
          return this.value == 0 ? '../../assets/logo.png' : 0
        }
    },
    template: `
    <img :src="photo" />
    <div>
      <button @click="value > 0 ? value-- : value++">Click</button>
    </div>
    `
  }).mount('#example');
</script>

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