Can you explain the distinction between v-on:click="..." and using onclick="..." in Vue.js?
I am aware that with v-on:click, the handler must be written inside the Vue object (as shown in the documentation example), but what are the benefits of this approach? It seems equally simple to just use onclick="..." to invoke a function (outside of the Vue object).
One of the main distinctions lies in the scope access. The scope bound to `onclick` is global, requiring the functions it calls to be accessible from the global scope. On the other hand, `v-on`'s scope is the Vue model.
Another notable feature is Vue's user-friendly API for defining custom events using `vm.$emit()`. It is also straightforward to listen for these events by using `v-on:customevent="callback"`, which can be easily related to a hypothetical `onfizz="callback()"`.
Considering this, it would be logical to introduce `v-on:click` for a consistent API alongside the other extensions offered by `v-on`.
/*
* This pollutes scope. You would have to start
* making very verbose function names or namespace your
* callbacks so as not collide with other handlers that
* you need throughout your application.
*/
function onClickGlobal() {
console.log("global");
}
const fizzbuzz = {
template: "<button @click='onClick'>FizzBuzz</button>",
methods: {
onClick() {
this.$emit("fizz");
}
}
};
const app = new Vue({
el: "#app",
components: {
fizzbuzz
},
methods: {
onClickModel() {
console.log("model");
},
onFizz() {
console.log("heard fizz");
}
}
});<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.min.js"></script>
<div id="app">
<section>
<h2>Buttons and Clicks</h2>
<!-- Calling function of the bound scope -->
<button @click="onClickModel">v-on Model</button>
<!-- Works as well, but calls the global -->
<button @click="onClickGlobal">v-on Global</button>
<!-- You need to explicitly invoke the function from onclick -->
<!-- This won't work because onClickModel isn't global -->
<button onclick="onClickModel()">onclick Model</button>
<!-- Works because onClickGlobal is global -->
<button onclick="onClickGlobal()">onclick Global</button>
<!-- You can technically call onClickModel through the global app -->
<!-- but you really shouldn't -->
<!-- Works because app.onClickModel is technically global -->
<button onclick="app.onClickModel()">onclick Global through app.onClickModel</button>
</section>
<section>
<h2>Custom Events</h2>
<fizzbuzz @fizz="onFizz"></fizzbuzz>
<!-- The element below doesn't work -->
<button onfizz="onClickGlobal">Hypothetical Fizz</button>
</section>
</div>When considering the scope, the advantage becomes clear. To address your query regarding its benefits:
There is no added value if you confine its use within a small scope. However, if you intend to incorporate it into another project that already contains JS components, you may encounter issues with conflicting global functions. By keeping everything within the component itself, these concerns are eliminated entirely.
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