Home > Article > Web Front-end > jQuery implements amount input box
jQuery implements amount input box
- 高洛峰Original
- 2016-12-28 09:51:221514browse
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 == 'object') {
// 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 == 'string') {
// 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 == '-' || 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>The above is the entire content of this article. I hope the content of this article will be helpful to everyone's learning. Or the work can bring some help, and I also hope to support the PHP Chinese website!
For more articles related to the jQuery implementation of the amount input box, please pay attention to the PHP Chinese website!