Validating form elements

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If the validation fails, the response is then sent back to the client, page that contains the web form is refreshed and a feedback is shown.

This method is secure because it will work even if Java Script is turned off in the browser and it can’t be easily bypassed by malicious users. Ajax calls to the server can validate as you type and provide immediate feedback.

You can use any build system you like when building apps with Spring, but the code you need to work with Maven is included here. Or you can build a single executable JAR file that contains all the necessary dependencies, classes, and resources, and run that.

Do you really need a form wide validation function for a single field?

The option of using pure HTML, sometimes with a touch of CSS, to complement Java Script form validation was until recently unthinkable.

Sure there have been all kinds of whacky plug-ins over the years aimed at achieving this, but never a single standard that we could work towards.

[Links checked February/10/2017] User’s input can be validated on the server and on the client (web browser).

Thus we have server-side and client-side validation. In the server-side validation, information is being sent to the server and validated using one of server-side languages.

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