Apr 5, 2010 · Try replacing the == for === which doesn't type cast. It might help you with the dropdown problem. Your function is returning false and it might also return -1. As I don't know …

Aug 8, 2012 · Inline validation powered by Javascript can be incredibly easy to implement, so there really is no excuse for not making your user’s lives as easy as possible. Here is a tutorial …

Jan 9, 2025 · Form validation using regular expressions (regex) ensures user input matches specific patterns, like email formats or password rules. It checks inputs upon submission, …

HTML form validation can be done by JavaScript. If a form field (fname) is empty, this function alerts a message, and returns false, to prevent the form from being submitted:

Dec 12, 2024 · In this article, we will explore how to add input validation messages dynamically using JavaScript. We'll walk through how to detect invalid input and display an appropriate …

Nov 21, 2012 · Yes you can do this type of validation in Javascript. In fact one of the primary uses for Javascript was to do form validation. There are multiple ways to do it and there are even …

Aug 19, 2022 · In this document, we have discussed JavaScript Form Validation using a sample registration form. The tutorial explores JavaScript validation on submit with detail explanation.

When it comes to client-side validation, you’ll have two options: JavaScript validation: you develop the validation logic using JavaScript. Or you can use a library to do so. Built-in form validation: …

In this example, we will validate using HTML5 inbuilt methods such as required, length in conjunction with Constraint Validation API to provide detailed error messages.

Oct 31, 2021 · In this tutorial we'll create a simple form validation using javascript. While client-side form validation gives a nice user experience, it can be tricked and bypassed really easily. …