Vue.js | vif directive (original) (raw)
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:
