Vue.js | v-if directive
Last Updated :
22 Jun, 2020
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The v-if directive is a Vue.js directive used to toggle the display CSS property of a element with a condition. If the condition is true it will make it visible else it will make it invisible. First, we will create a div element with id as app and let's apply the v-if directive to this element with data. Now we will create this data by initializing a Vue instance with the data attribute containing the value.
Syntax:
v-if="data"
Parameters: This directive accepts a single parameter which is the data or a condition.
Example 1: This example uses VueJS to show an element with v-if.
<!DOCTYPE html>
<html>
<head>
<title>
VueJS | v-if directive
</title>
<!-- Load Vuejs -->
<script src=
"https://cdn.jsdelivr.net/npm/vue/dist/vue.js">
</script>
</head>
<body>
<div style="text-align: center;width: 600px;">
<h1 style="color: green;">
GeeksforGeeks
</h1>
<b>
VueJS | v-if directive
</b>
</div>
<div id="canvas" style="border:1px solid #000000;
width: 600px;height: 200px;">
<div id="app">
<h2 v-if="message">
This if condition is executed
</h2>
</div>
</div>
<script>
var app = new Vue({
el: '#app',
data: {
message: true
}
})
</script>
</body>
</html>
Output:
Example 2: This example uses VueJS to show an element with v-if arithmetic conditions.
<!DOCTYPE html>
<html>
<head>
<title>
VueJS | v-if directive
</title>
<!-- Load Vuejs -->
<script src=
"https://cdn.jsdelivr.net/npm/vue/dist/vue.js">
</script>
</head>
<body>
<div style="text-align: center;width: 600px;">
<h1 style="color: green;">
GeeksforGeeks
</h1>
<b>
VueJS | v-if directive
</b>
</div>
<div id="canvas" style="border:1px solid #000000;
width: 600px;height: 200px;">
<div id="app">
<h2 v-if="a > 10">a is greater than 10</h2>
<h2 v-if="a < 10">a is smaller than 10</h2>
<h2 v-if="a == 10">a is equal to 10</h2>
</div>
</div>
<script>
var app = new Vue({
el: '#app',
data: {
a: 9
}
})
</script>
</body>
</html>
Output:
