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jquery input number validator
$.fn.numeral = function() {
this.bind("keydown",
function(e) {
// Allow: backspace, delete, tab, escape and enter
if ($.inArray(e.keyCode, [46, 8, 9, 27, 13, 110]) !== -1 ||
// Allow: Ctrl+A, Command+A
(e.keyCode == 65 && (e.ctrlKey === true || e.metaKey === true)) ||
// Allow: home, end, left, right, down, up
(e.keyCode >= 35 && e.keyCode <= 40)) {
// let it happen, don't do anything
return;
}
// Ensure that it is a number and stop the keypress
if ((e.shiftKey || (e.keyCode < 48 || (e.keyCode > 57 && e.keyCode != 189 && e.keyCode != 190))) && (e.keyCode < 96 || e.keyCode > 105)) {
e.preventDefault();
}
// 如果使用者輸入-,先判斷現在的值有沒有-,如果有,就不允許輸入
if (e.keyCode == 189 && /-/g.test(this.value)) {
e.preventDefault();
}
// 如果使用者輸入.,先判斷現在的值有沒有.,如果有,就不允許輸入
if (e.keyCode == 190 && /\./g.test(this.value)) {
e.preventDefault();
}
});
this.bind("keyup",
function() {
if (/[^0-9\.-]/g.test(this.value)) {
this.value = this.value.replace(/[^0-9\.-]/g, '');
}
if (/-/g.test(this.value) && !/^-/g.test(this.value)) {
this.value = this.value.replace(/-/g, '');
}
});
};
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