Vue Introduction: Difference between revisions
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Revision as of 12:17, 9 December 2020
Intro
Hello John (No world)
Resource for the tutorial was https://github.com/johnpapa/vue-getting-started
The vue js lives at https://cdn.jsdelivr.net/npm/vue. Below is a simple example just showing two way binding
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="https://cdn.jsdelivr.net/npm/vue"></script>
</head>
<body>
<div id="app">
<input type="text" v-model="name">
<p>Hello {{name}}</p>
</div>
<script>
new Vue({
el: "#app",
data() {
return {
name: "John"
}
}
})
</script>
</body>
</html>
Sections
Vue files are comprised of three sections. No prizes for what each bit does
<template>
<a v-bind:href="github" target="_blank">
</a>
<template/>
<script>
</script>
<style>
</style>Displaying Data and Events
Data Model
We can define a data model and use it with standard double curly braces.
</template>
...
<div>{{hero.id}}</div>
...
</template>
<script>
export default {
name: 'Heroes',
data() {
return {
id: 20,
firstName: 'Fred',
lastName: 'Bloggs'
message: ''
}
},
};
</script>
Data Binding
Binding we can use v-bind or the short cut : (full colon). So in the template put the colon and define a data component below
<template>
...
<a
v-bind:="github"
target="_blank"
rel="noopener noreferrer"
>
<i class="fab fa-github fa-2x" aria-hidden="true"></i>
</a>
<a
:href="twitter"
target="_blank"
rel="noopener noreferrer"
>
<i class="fab fa-twitter fa-2x" aria-hidden="true"></i>
</a>
...
</template>
<script>
export default {
name: 'headerLinks',
data() {
return {
github: 'https://github.com/johnpapa/vue-getting-started',
twitter:'https://twitter.com/john_papa',
}
},
}
</script>Two Way Binding
To bind two-way with v-model with the model and property.
</template>
<input class="input" id="firstName" v-model="hero.firstName"/>
</template>Event Binding
Example
To bind events we use v-on: or @ to bind our methods to an event.
</template>
<button @click="cancelHero">Cancel</button>
<button v-on:click="cancelHero">Cancel 2</button>
</template>
<script>
export default {
name: 'Heroes',
data() {
...
},
methods: {
cancelHero() {
this.message = ''
},
}
};
</script>Keyup
Below is an example of binding to the keyup event. The .esc denotes the escape key. </template> <script>
<select
id="power"
v-model="hero.power"
:class="{ invalid: !hero.power }"
@keyup.esc="clearPower"
>
</script> </syntaxhighlight>
Checkbox, Radio
No surprises here
<template>
<input
type="radio"
id="color-red"
value="red"
v-model="hero.capeColor"
/>
<input
type="checkbox"
class="is-primary"
id="active"
v-model="hero.active"
/>
</template>Styles and Classes
Styles and Classes are trickier because of the object approach of the data
<template>
<select
id="power"
v-model="hero.power"
@keyup.esc="clearPower"
>
<div
class="color-line"
:style="{ 'background-color': hero.capeColor }"
></div>
</template>