Learn how to check if an input field is empty in React using different methods, such as empty string validation, react hook form, and JavaScript. This tutorial will show you how to handle empty field validation in React JS with examples
Learn how to convert a string to a number using JavaScriptJavaScript provides various ways to convert a string value into a number.Best: use the Number objectThe best one in my opinion is to use the Number object, in a non-constructor context (without the new keyword):...
Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more.
JavaScript offers many ways to check if a string contains a substring. Learn the canonical way, and also find out all the options you have, using plain JavaScript
A better way to validate special characters in passwords? A connection attempt failed because the connected party did not properly respond after a period of time A DataTable named 'tablename' already belongs to this DataSet. A field or property with the name X was not found on the selected ...
to search, match, and validate strings. Probably the most common use case for regular expressions isform validation- checking whether the string is a (valid) email, a phone number, etc. But in this article, we'll use it to count the number of occurrences of a substring in a string. ...
c# fastest way to iterate through List or DataTable to validate each row C# File being used by another process. C# file copy via remote to another pc C# file exists on network drive C# file write using another account also changed file privilege, How to avoid it? C# File.WriteAllLines(st...
Notice we added an "onsubmit" event trigger that points to the JavaScript function "ValidateFirstName()" we've defined in the HTML script tag. Notice that we added a "return" keyword in front of the trigger. The "return" statement sets the onsubmit function to true or false. If the boo...
In the Code Editor, add the following code, replacing Contact with the name of your entity and ContactName with the name of the string field that you want to validate: JavaScript Copy if (screen.Contact.ContactName.indexOf('!') != -1) { screen.findContentItem("ContactName").validation...
In the Code Editor, add the following code, replacing Contact with the name of your entity and ContactName with the name of the string field that you want to validate: JavaScript Copy if (screen.Contact.ContactName.indexOf('!') != -1) { screen.findContentItem("ContactName").validation...