逗号后用Javascript Maxlength输入

Question

是否可以将此jquery代码转换为javascript？

$("#field").keypress(function (evt) {
if (evt.which == 46) {
    $(this).val($(this).val() + ',');
    evt.preventDefault();
}

//The input of more than 2 numbers after the decimal point is prevented
var foo = $(this).val();
if( !foo.match(/^(\d)*,?(\d){0,1}$/) ){
     evt.preventDefault(); 
}
});

jsfiddle

提前Thanx！

Answer 1

最后我找到了解决方案。希望它可以帮助任何人

<script type="text/javascript">
  function decimals(that) {
  var s = that.value;
  var i = s.indexOf(".");
  if (i < 0 || s.substr(i+1).length < 2) return;
  alert("Only 1 digit to the right of the decimal are allowed!");
  that.value = s.substring(0,i+2);
  }
</script>

<input type="text" size="5" maxlength="5" onkeyup="decimals(this)">

祝福

Answer 2

检查此代码http://jsfiddle.net/s62W5/可能会对您有所帮助

var x=document.getElementById("field");
 x.onkeydown = function(e){

 var keyPress;

 if (typeof event !== 'undefined') {
   keyPress = event.keyCode;
 }
 else if (e) {
   keyPress = e.which;
 }
  if (keyPress == 46) {
  x.value= x.value + ',';

 }
};