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Setup Client side javascript validation

How to Setup Client side javascript validation ?

Aman Jain, September 16, 2021September 29, 2021

In this tutorial we will learn javascript validation without using any third party library. we will validate the simple form with 5 inputs fields.

Let’s start with simple steps

Step 1: Create a html file

Firstly we are going to create html file which contains a form with basic fields.

  1. first name
  2. last name
  3. email
  4. password

Index.html

<form name="registerform" onsubmit="return onSubmitHandle()">
              <div class="form-group">
                <label>First Name</label>
                <input
                  id="firstName"
                  type="text"
                  name="firstName"
                  class="form-control"
                />
              </div>
              <div class="form-group">
                <label>Last Name</label>
                <input
                  id="lastName"
                  type="text"
                  name="lastName"
                  class="form-control"
                />
              </div>
              <div class="form-group">
                <label>Email</label>
                <input
                  id="email"
                  type="text"
                  name="email"
                  class="form-control"
                />
              </div>
              <div class="form-group">
                <label>Password</label>
                <input
                  type="password"
                  name="password"
                  id="password"
                  class="form-control"
                />
              </div>
              <div class="form-group">
                <label>Confirm Password</label>
                <input
                  type="password"
                  name="confirmPassword"
                  class="form-control"
                />
              </div>
              <div class="form-group">
                <input type="submit" value="Submit" />
              </div>
            </form>

Step 2 : Create script file

We can use inline javascript or a separate javascript file. we will create 3 function.

  1. getElement : To find the input element in dom
  2. isEmpty : To check the input element is empty or not
  3. onSubmitHandler : To check the form validation on submit.

index.js

 function getElement(id) {
      return document.getElementById(id).value;
    }
    function isEmpty(id) {
      if (getElement(id) == '') {
        return true;
      }
      return false;
    }
    function ¸() {
      var isFormValid = true;
      if (isEmpty('firstName')) {
        isFormValid = false;
        alert('Please enter first name');
      } else if (isEmpty('lastName')) {
        isFormValid = false;
        alert('Please enter last name');
      } else if (isEmpty('email')) {
        isFormValid = false;
        alert('Please enter email');
      } else if (isEmpty('password')) {
        isFormValid = false;
        alert('Please enter password');
      }

      return isFormValid;
    }

Working live example and code

DOWNLOAD CODE

Related

Javascript

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Aman Jain
Aman Jain

With years of hands-on experience in the realm of web and mobile development, they have honed their skills in various technologies, including Laravel, PHP CodeIgniter, mobile app development, web app development, Flutter, React, JavaScript, Angular, Devops and so much more. Their proficiency extends to building robust REST APIs, AWS Code scaling, and optimization, ensuring that your applications run seamlessly on the cloud.

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