Validating a textbox in javascript 100 free chat app

event allows you to run Javascript code when the user clicks away from the field. In order to validate the input, we have to test it against a set of rules that define a pass or fail.

With this regex rule saved, we can then run a test on our input to see if what was entered matches our defined rule. Save this out and refresh the page in your browser.For this tutorial I’m just going to include all of the HTML and Javascript in one file to keep things simple.So to start off, create yourself a little HTML file, like this.The validation you’ve added so far is great because it allows the user to correct their mistakes as they progress.The next step is to prevent the form from being submitted if any of the validation rules are broken.

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