i've just build a javascript function with a regex control that allows 3 numbers and one dot.
function restrictNumber(e) {
var newValue = this.value.replace(new RegExp(/^(?!^(?:\d{1,3}|\d(?:\d?\.\d?|\.\d{2}))$).*/, 'gm'), "");
this.value = newValue;
}
$('.decimal').on('input', restrictNumber);<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<input class="decimal" type="text">The specs of the regex are:
Here is a regex demo for it: https://regex101.com/r/3Ru1O3/3/
i tried to "block" the input when a char is put in that isn't fitting. But when i try to test it deletes my hole string.
How can i change that behaviour that i just can't set new numbers put the string isnt vanishing.
You didn't say much about your actual requirements, as in, if the decimal is required at a certain place value, etc.. but based on what your existing regex does, it could definitely be shortened.
function restrictNumber(e) {
var newValue = this.value.replace(/[^\d\.]/, "").substr(0,4);
this.value = newValue;
}
$('.decimal').on('input', restrictNumber);<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<input class="decimal" type="text">