Exploring the process of implementing a dynamic background image feature in Vue

Looking to create a dynamic navbar and change its background image. I attempted the following:

Here is my attempt:

<b-navbar toggleable="lg" v-bind:style="headerStyle">
this.headerStyle = {
                    backgroundImage: 'url("../../assets/img/sky-views/3.png") !important'
                }

After trying this and inspecting it, I encountered the following:

https://i.sstatic.net/bFGT0.png

The image was not displayed as it could not be found.

However, when I added a class to the element and applied the same path to the class, the image appeared:

<b-navbar toggleable="lg" class="header-wrapper">
...
    <style lang="scss">
    .header-wrapper {
            background-image: url("../../assets/img/sky-views/3.png") !important;
        }
    </style>

Upon inspection, I noticed the following:

https://i.sstatic.net/liriD.png

What am I missing here? Why is the resulting path different? How can I fix this issue?

javascriptcssvue.jsfrontend

Answer №1

When Webpack processes your Vue application, it automatically converts CSS url() paths to their compiled versions. However, this.headerStyle is simply an object variable in a Vue component script, so Webpack does not have the capability to transform the URL.

In a response to a similar query on Stack Overflow, the usage of the require() function is suggested to instruct Webpack to handle the URL transformation. For your specific script, the updated variable would appear as follows:

this.headerStyle = {
  backgroundImage: `url("${require('../../assets/img/sky-views/3.png')}") !important`
}

Then you can apply 

v-bind:style="headerStyle"
in the template in the same way.

Keep in mind that the output may vary based on your build configuration. In my test, I received a large base64-encoded string in the outputted style attribute by default instead of a direct URL to the asset. However, the final visual outcome remained consistent.

Answer №2

I discovered another method to assign a dynamic class name.

<b-navbar toggleable="lg" v-bind:class="headerClass">
...
this.headerClass = 'night'
...
.night {
            background-image: url("../../assets/img/sky-views/nightImage.png") !important;
        }
</style>

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