Vue.js | v-if directive
Last Updated :
22 Jun, 2020
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.
HTML
<!DOCTYPE html>
< html >
< head >
< title >
VueJS | v-if directive
</ title >
< script src =
</ 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.
HTML
<!DOCTYPE html>
< html >
< head >
< title >
VueJS | v-if directive
</ title >
< script src =
</ 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:
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