Vue Js Restrict Special Character Validation: To restrict special characters in an input field in
Vue.js, you can create a custom directive that listens to the input event and validates the input value against a regular expression. The regular expression can define which characters are allowed or disallowed.In this Explain we will learn how to validate special character using Vue Js
How to restrict special characters in textbox using Vue Js?
This code is for a Vue.js application that restricts special characters in an input field. The input value is stored in a data property called “inputValue”. The method “restrictSpecialChars” is called when the input value changes and it checks if the input contains any special characters. If it does, the “invalidInput” property is set to true and a message is displayed. Any special characters are then removed from the input value using a regular expression. The updated input value is then displayed in the input field using two-way data binding.
Implementing Input Field Validation to Restrict Special Characters in
Vue.js
<div id="app">
<h3>Vue Js Restrict Special Characters in an input field</h3>
<input v-model="inputValue" @input="restrictSpecialChars" />
<pre v-if="invalidInput" style="color: red;">Invalid input</pre>
</div>
<script type="module">
import { createApp } from "vue";
createApp({
data() {
return {
inputValue: "",
invalidInput: false
}
},
methods: {
restrictSpecialChars() {
if (/[^A-Za-z0-9]/.test(this.inputValue)) {
this.invalidInput = true;
} else {
this.invalidInput = false;
}
this.inputValue = this.inputValue.replace(/[^A-Za-z0-9]/g, "");
}
}
}).mount("#app");
</script>
Output of above example
![](https://danatec.vn/wp-content/uploads/2024/07/6-8.webp)