JavaScript code to stop form submission

Question

One way to stop form submission is to return false from your JavaScript function.

When the submit button is clicked, a validation function is called. I have a case i

Answer 1

Hemant and Vikram's answers didn't quite work for me outright in Chrome. The event.preventDefault(); script prevented the the page from submitting regardless of passing or failing the validation. Instead, I had to move the event.preventDefault(); into the if statement as follows:

    if(check if your conditions are not satisfying) 
    { 
    event.preventDefault();
    alert("validation failed false");
    returnToPreviousPage();
    return false;
    }
    alert("validations passed");
    return true;
    }

Thanks to Hemant and Vikram for putting me on the right track.