In this article we will show you the solution of JavaScript form validation example download, before submitting a form we need to check if the input is in the right format.
In HTML, if we submit a form then using JavaScript we can check if the input submitted is validated or not.
Step By Step Guide On Javascript Form Validation Example Download :-
At first, let us see an example first on form validation using JavaScript.
<!DOCTYPE html> <html lang = " en " > <head> <meta charset = " UTF - 8" > <meta http-equiv = " X-UA-Compatible " content = " IE=edge " > <meta name = " viewport " content = " width = device-width , initial-scale = 1.0 " > <title>JavaScript form validation example download</title> <style> h1 { font-size : larger ; font-weight : bolder ; color : rgb(113, 221, 113) ; text-align : center ; } h3 { text-align : center ; } .container { display: flex; padding-top: 60px; align-items: center; justify-content: center; font-family: Cambria, Cochin, Georgia, Times, 'Times New Roman', serif; } form input{ margin: 2px solid black; padding: 8px; } p { color: red ; } </style> </head> <body> <h1> TALKERSCODE </h1> <h3> javascript form validation example download </h3> <p id="error"></p> <div class="container"> <form action="/" method="get" id="form"> <div> <label for="f_name"> First Name: </label> <input type="text" name="f_name" id="f_name"> </div> <div> <label for="l_name"> Last Name: </label> <input type="text" name="l_name" id="l_name"> </div> <div> <label for="email"> email ID: </label> <input type="email" name="email" id="email"> </div> <div> <label for="password"> password: </label> <input type="password" name="password" id="password"> </div> <button type="submit"> submit </button> </form> </div> <script> const f_name = document.getElementById('f_name') ; const l_name = document.getElementById('l_name') ; const email = document.getElementById('email') ; const password = document.getElementById('password') ; const errorElement = document.getElementById('error') const form = document.getElementById('form') ; form.addEventListener('submit' , (e) => { let messages = [] if (f_name.value === '' || f_name.value == null){ messages.push (' Please enter your fisrt name') } if (l_name.value === '' || l_name.value == null){ messages.push (' Please enter your last name') } if (email.value === '' || email.value == null){ messages.push (' Please enter your email ID') } if (password.value.length <= 8) { messages.push ('password must be longer than 8 characters') } if (messages.length > 0){ e.preventDefault() errorElement.innerHTML = messages.join (', ') } }) </script> </body> </html>
- First, we write <! DOCTYPE html> which we used as an instruction to the web browser about what version of HTML file is written in.
- Secondly, the <html> tag is used to indicate the beginning of an HTML document.
- As above now the <head> tag is used to contain information about the web page. In this tag, a <title> tag is used which helps us to specify a webpage title.
- Both <head> and <title> tags are Paired tags. So, both have </head> and </title> ending tags respectively.
- Thirdly, the <body> tag is used to define the webpage body. All the contents to show on the website are written here.
- <h1> tag used to add heading here.
- Create a <div> with the Id ‘error’ , which will be used here to show the error messages if the form is invalid.
- Creating a <div> with the class container. Between that <div> create a form using the HTML input property.
- Created the <style> tag to add CSS to the HTML page.
- to add JavaScript Create a <script> tag.
- Create a variable using cosnt tag for every input tag, the errorElement and the form by document.getElementById().
- Using the .addEventListener() tag to add the condition of the validation if the user click on submit.
Conclusion :-
At last here in conclusion, here we can say that with this article’s help, we know how to do form validation using JavaScript.
I hope this article on JavaScript form validation example download helps you and the steps and method mentioned above are easy to follow and implement.