There are also clever ways of styling the label to look like a checkbox and hiding the actual checkbox so you can use your own graphic, font icon or CSS creation: , but actually toggling the checkbox in the background.We know the checkbox is changing because that's what drives the CSS effect: The HTML for this example is the same as above. I'm not much of a developer, but stubble on your website searching for exactly what you posted here.We know that the checkbox is unchecked by default so we need to tell the browser what message to display.The event handler on the checkbox then toggles the error message.Using vanilla Java Script we can prevent form submission as follows: All this does is confirm before submitting the form that the checkbox is checked.If not, an alert is displayed and focus is moved to the checkbox.Did you find any of these examples useful or have any questions? However, I noticed that your script is throwing errors and thought maybe i'd check with you to see if you might know why. I'm getting : Uncaught Syntax Error: Unexpected token ...and then about 4 of these: Uncaught Type Error: Cannot read property 'add Event Listener' of null(…) Anyways, just thought I'd see if you knew why.
I don't want to write a whole bunch of code for a single checkbox.
At time of writing Safari does not enforce input fields.
If you're using Safari or another unsupporting browsers all the examples will just display the Java Script alert box.
Here you can see the custom message being displayed in Firefox: Custom messages can be set in a similar manner for object states (validity.value Missing, validity.pattern Mismatch, ...) to determing the right message. The previous example was starting to become a bit cluttered with two Java Script script blocks as well as the The forms behaviour should be unchanged: While it looks much more complicated, this is a better solution because it allows for the HTML and Java Script to be maintained separately.
The only hooks between them are the values for the form itself and the checkbox input element.