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jQuery implements a method that only allows input of numbers and decimal points_jquery

WBOY
WBOYOriginal
2016-05-16 15:12:271397browse

The example in this article describes the jQuery method of allowing only numbers and decimal points to be entered. Share it with everyone for your reference, the details are as follows: 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script src="jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">
//示例代码：
//只允许输入数字与.:<input type="text" name="test" id="test" onkeydown="checkKeyForFloat(this.value,event)" style="ime-mode: disabled" />
//只允许输入数字 :<input type="text" name="test2" id="test2" onkeydown="checkKeyForNum(this.value,event)" style="ime-mode: disabled" />
//只允许输入数字与小数点
function checkKeyForFloat(value, e) {
 var isOK = false;
 var key = window.event &#63; e.keyCode : e.which;
 if ((key > 95 && key < 106) || //小键盘上的0到9
 (key > 47 && key < 60) || //大键盘上的0到9
 (key == 110 && value.indexOf(".") < 0) || //小键盘上的.而且以前没有输入.
 (key == 190 && value.indexOf(".") < 0) || //大键盘上的.而且以前没有输入.
 key == 8 || key == 9 || key == 46 || key == 37 || key == 39 //不影响正常编辑键的使用(8:BackSpace;9:Tab;46:Delete;37:Left;39:Right)
) {
  isOK = true;
 } else {
  if (window.event) //IE
  {
   e.returnValue = false; //event.returnValue=false 效果相同.
  }
  else //Firefox
  {
   e.preventDefault();
  }
 }
 return isOK;
}
//只允许输入数字
function checkKeyForInt(value, e) {
 var isOK = false;
 var key = window.event &#63; e.keyCode : e.which;
 if ((key > 95 && key < 106) || //小键盘上的0到9
 (key > 47 && key < 60) || //大键盘上的0到9
 key == 8 || key == 9 || key == 46 || key == 37 || key == 39 //不影响正常编辑键的使用(8:BackSpace;9:Tab;46:Delete;37:Left;39:Right)
) {
  isOK = true;
 } else {
  if (window.event) //IE
  {
   e.returnValue = false; //event.returnValue=false 效果相同.
  }
  else //Firefox
  {
   e.preventDefault();
  }
 }
 return isOK;
}
//设置有自定义属性 dtype 的文本框 允许输入的范围
function setDType() {
 $(":text[dtype]").each(function () {
  var dtype = $(this).attr("dtype");
  var isOK = true;
  switch (dtype) {
   case "number":
    $(this).css("ime-mode", "disabled").keydown(function (event) {
     isOK = checkKeyForFloat($(this).val(), event);
     if (!isOK) {
      //$(this).SuperFocus("", 500);
     }
     return isOK;
    });
    break;
   default:
    break;
  }
 });
}
</script>
<script type="text/javascript">
$(function () {
 setDType();
});
</script>
</head>
<body>
年龄: <input type="text" maxlength="3" onkeydown="checkKeyForInt(this.value,event)" style="ime-mode: disabled"/><br />
身高：<input type="text" maxlength="5" dtype="number" />
</body>
</html>

Readers who are interested in more jQuery-related content can check out the special topics on this site: "JQuery drag effects and skills summary", "jQuery extension skills summary", "JQuery common classic special effects summary", "jQuery animation and special effects usage summary", "jquery selector usage summary" and "jQuery common plug-ins and usage Summary》

I hope this article will be helpful to everyone in jQuery programming.

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