the requirement is like this. The input input box can only enter numbers and decimals, the beginning cannot be a dot and zero, and the decimal can only be two digits at most. Thank you!
the requirement is like this. The input input box can only enter numbers and decimals, the beginning cannot be a dot and zero, and the decimal can only be two digits at most. Thank you!
/ ^ d * (?: .d {0 2})? $/
reference article: http://www.jb51.net/article/8.
<input id="input">var reg = /^[1-9]\d*(\.\d{0,2})?$|^0(\.\d{0,2})?$|^-([1-9]{1}\d*(\.\d{0,2})?)?$|^-(0(\.\d{0,2})?)?$/;
var input = document.getElementById('input');
var oldValue = '';
input.addEventListener('input',function(){
console.log(input.value)
if(input.value && !reg.test(input.value)){
input.value = oldValue;
}
oldValue = input.value;
});
input.addEventListener('change',function(){
if(input.value.endsWith('.') || input.value.endsWith('-')){
input.value = input.value.slice(0,-1);
}
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