Why Does Dynamic Image Loading Fail with Vue.js and Webpack?

Dynamic Image Loading Issues in Vue.js with Webpack

When building web applications with Vue.js and Webpack, displaying dynamic images can sometimes pose challenges. One common scenario is when image file names are stored in a variable and need to be appended to a base path to generate a complete image source.

A developer encountered an issue where the following code, intended to dynamically display images based on a computed property, failed:

<div class="col-lg-2" v-for="pic in pics">
   <img v-bind:src="'../assets/' + pic + '.png'" v-bind:alt="pic">
</div>

Interestingly, a similar approach using a static image path worked as expected:

<img src="../assets/dog.png" alt="dog">

The puzzle lay in the difference between the two approaches. Using a static path directly instructs Webpack to include the image in the build, ensuring its availability at runtime. However, the dynamic approach relies on the image path being generated at runtime, which Webpack cannot anticipate during the build process. Consequently, the image is not included in the bundle, resulting in a missing file.

To address this issue, the developer turned to the require.context() method, which provides a way to dynamically load modules or files within a specific context. By using the following code:

getImgUrl(pet) {
    var images = require.context('../assets/', false, /\.png$/)
    return images('./' + pet + ".png")
}

and updating the HTML as follows:

<div class="col-lg-2" v-for="pic in pics">
   <img :src="getImgUrl(pic)" v-bind:alt="pic">
</div>

the developer achieved the desired effect. require.context() allowed them to dynamically load the image file based on the value of the pic property, and Webpack included the required image in the bundle.

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