I need a specific requirement for my form. The textbox field in my form is labeled "DEA License number", and I want it to only allow the user to enter alphabetic characters for the first two characters, followed by numbers afterward. I am looking to implement this functionality using JavaScript. Note: I do not want validation, but rather a way to prevent the user from inputting anything other than the specified format.
Have you considered using regular expressions (regex)?
You might find this post helpful as it discusses a similar objective: RegEx pattern any two letters followed by six numbers
Consider utilizing masked textboxes for improved user input.
For instance, explore these resources:
To verify this, you can run a regex test:
function checkValidity(str) {
return /^[a-zA-Z]{2}\d+$/.test(str);
}
If you're looking to prevent users from entering invalid characters without actually validating it, you could potentially achieve this using an input event listener on an element with the id "test":
var previousValue = "";
document.getElementById("test").addEventListener("input", function(event) {
var currentValue = event.target.value;
if ((currentValue.length <= 2 && /^[a-zA-Z]*$/.test(currentValue)) || (currentValue.length > 2 && /^[a-zA-Z]{2}\d+$/.test(currentValue))) {
previousValue = currentValue;
} else {
event.target.value = previousValue;
}
})
Despite this approach, validation would still be required upon submission to ensure that the user hasn’t entered an incomplete or incorrect value.
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