Duck Friend

How to add html attributes - Vuejs

May 17, 2019

Hi Friend,

I recently was working on a task where I had to consume a REST endpoint which is providing validation rules. long story short, I wanted to be able to dynamically set required pattern and so on. I thought okay, I am gonna create a directive and use element.setAttribute but then I remembered that vuejs core team is awesome

v-bind directive to the rescue

The v-bind directive is so powerful as it provides you with attribute binding capabilities.

you are probably familiar with it’s shorthand version :

<input v-bind:src="imgSrc" />

<input :src="imgSrc" />

Now image we don’t actually know which attribute we want to bind, maybe it’s the src maybe it’s the title or maybe both.

v-bind can actually taken object and vola, you have a dynamically changing html attributes.

<input v-bind="validationRules" />
get validationRules () {
    return {
        required: true,
        pattern: this.someMethodToGetPattern(),
        src: false

Using this you can do so many cool stuff, I have only used it with form validation but I see myself using this more and more.

duck tip: vuejs automatically removes attributes that have their values set to false

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