input field take only number and one comma code example
Example: input field take only number and one comma
function checkKey() {
var clean = this.value.replace(/[^0-9,]/g, "")
.replace(/(,.*?),(.*,)?/, "$1");
// don't move cursor to end if no change
if (clean !== this.value) this.value = clean;
}
// demo
document.querySelector('input').oninput = checkKey;