Vue Js Check if Input is Empty:In Vue.js, you can check if an input is empty using the not operator. The not operator is represented by an exclamation mark (!) and can be used to negate a boolean value. To check if an input is empty, you can bind the input value to a data property using v-model and then use the not operator to negate the truthiness of the value. For example, you can check if an input field with the v-model “username” is empty by using the expression “!username”, which will return true if the input is empty and false if it is not.
What is the recommended approach in Vue js check if an input field is empty?
This Vue.js code defines a form with an input field and a submit button. When the submit button is clicked, the submitForm method is called, which checks whether the input field is empty or not. If the input field is empty, it shows an alert message saying “Input field is empty!” and returns without doing anything else. Otherwise, it logs the value of the input field to the console.
To check if the input field is empty, the submitForm method uses a simple if statement with a negation operator (!) to check if the inputValue data property is falsy.
Vue Js Check If Input Is Empty Example
<div id="app">
<label for="myInput">Enter something:</label>
<input type="text" id="myInput" v-model="inputValue">
<button @click="submitForm">Submit</button>
</div>
<script type="module">
const app = new Vue({
el: "#app",
data() {
return {
inputValue: '',
};
},
methods: {
submitForm() {
if (!this.inputValue) {
alert('Input field is empty!');
return;
}
// Do something with the input value
console.log(this.inputValue);
},
},
});
</script>
Output of Vue Js Check if Input is empty
