Custom Directives (En)

Intro

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In addition to the default set of directives shipped in core (v-model and v-show), Vue also allows you to register your own custom directives. Note that in Vue 2.0, the primary form of code reuse and abstraction is components - however there may be cases where you just need some low-level DOM access on plain elements, and this is where custom directives would still be useful. An example would be focusing on an input element, like this one:

When the page loads, that element gains focus (note: autofocus doesn’t work on mobile Safari). In fact, if you haven’t clicked on anything else since visiting this page, the input above should be focused now. Now let’s build the directive that accomplishes this:

// Register a global custom directive called v-focus
Vue.directive('focus', {
// When the bound element is inserted into the DOM...
inserted: function (el) {
// Focus the element
el.focus()
}
})

If you want to register a directive locally instead, components also accept a directives option:

directives: {
focus: {
// directive definition
}
}

Then in a template, you can use the new v-focus attribute on any element, like this:

<input v-focus>

Hook Functions

A directive definition object can provide several hook functions (all optional):

We’ll explore the arguments passed into these hooks (i.e. el, binding, vnode, and oldVnode) in the next section.

Directive Hook Arguments

Directive hooks are passed these arguments:

Apart from el, you should treat these arguments as read-only and never modify them. If you need to share information across hooks, it is recommended to do so through element’s dataset.

An example of a custom directive using some of these properties:

<div id="hook-arguments-example" v-demo:foo.a.b="message"></div>
Vue.directive('demo', {
bind: function (el, binding, vnode) {
var s = JSON.stringify
el.innerHTML =
'name: ' + s(binding.name) + '<br>' +
'value: ' + s(binding.value) + '<br>' +
'expression: ' + s(binding.expression) + '<br>' +
'argument: ' + s(binding.arg) + '<br>' +
'modifiers: ' + s(binding.modifiers) + '<br>' +
'vnode keys: ' + Object.keys(vnode).join(', ')
}
})
new Vue({
el: '#hook-arguments-example',
data: {
message: 'hello!'
}
})

Function Shorthand

In many cases, you may want the same behavior on bind and update, but don’t care about the other hooks. For example:

Vue.directive('color-swatch', function (el, binding) {
el.style.backgroundColor = binding.value
})

Object Literals

If your directive needs multiple values, you can also pass in a JavaScript object literal. Remember, directives can take any valid JavaScript expression.

<div v-demo="{ color: 'white', text: 'hello!' }"></div>
Vue.directive('demo', function (el, binding) {
console.log(binding.value.color) // => "white"
console.log(binding.value.text) // => "hello!"
})