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jQuery implements amount input box

高洛峰Original: 2016-12-28 09:51:221551browse

During the front-end development process, numerical input boxes are usually used. For example, it is required to enter an amount, and it is prohibited to enter non-numeric characters or paste non-numeric characters. How to achieve this?

First, use (function($){ })(jQuery); to execute the function immediately for module isolation, which can avoid variable pollution problems with other functional modules and plug-ins. All private global variables can be placed At the head of the immediate execution function.

Then extend the numbox method on the jquery prototype and directly add the code

(function ($) {
 // 数值输入框
 $.fn.numbox = function (options) {
 var type = (typeof options);
 if (type == &#39;object&#39;) {
　　　　　　　// 创建numbox对象
  if (options.width) this.width(options.width);
  if (options.height) this.height(options.height);
  this.bind("input propertychange", function (obj) {
  numbox_propertychange(obj.target);
  });
  this.bind("change", function (obj) {
  var onChange = options.onChange;
  if (!onChange) return;
  var numValue = Number(obj.target.value);
  onChange(numValue);
  });
  this.bind("hide", function (obj) {
  var onHide = options.onHide;
  if (!onHide) return;
  var numValue = Number(obj.target.value);
  onHide(numValue);
  });
  return this;
 }
 else if (type == &#39;string&#39;) {
　　　　　　　// type为字符串类型，代表调用numbox对象中的方法
  var method = eval(options);
  if (method) return method(this, arguments);
 }
 }
 // 属性值变化事件
 function numbox_propertychange(numbox) {
 if (numbox.value == &#39;-&#39; || numbox.value == numbox.oldvalue) return;
 var numvalue = Number(numbox.value);
 if (isNaN(numvalue)) {
  numbox.value = numbox.oldvalue;
 }
 else {
  numbox.oldvalue = numbox.value;
 }
 }
 // 获取值
 function getValue(numbox) {
 var value = numbox.val();
 return Number(value);
 }
 // 设置值
 function setValue(numbox, params) {
 if (params[1] == undefined) return;
 var numvalue = Number(params[1]);
 if (!isNaN(numvalue)) {
  for (var i = 0; i < numbox.length; i++) {
  numbox[i].focus();
  numbox[i].value = numvalue;
  numbox[i].oldvalue = numvalue;
  }
 }
 }
})(jQuery); // 这里传入jQuery对象作为参数，是为了避免在模块内部直接去访问全局对象，避免过度依赖其他模块，降低耦合度，更加规范化，可控性更高，可参考其他成熟jQuery插件（easyui、bootstrap）

The calling method is as follows

<body>
 <input id="test" />
 <script>
 $("#test").numbox({
  width: 150,
  height: 20
 });
 </script>
</body>

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