How does jquery realize that only numbers and decimal points can be input
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- 2023-05-29 09:55:491779browse
jquery implements the operation method of inputting only numbers and decimal points: 1. Create an html sample file; 2. Introduce the jQuery file in the head tag; 3. Use "$("input box").keypress() " syntax, to monitor the keyboard, only decimal point and number input is allowed; 4. Use regular expressions to match "/D|^0/g" and replace it with "/[^0-9.]/g".
Operating system for this tutorial: Windows 10 system, jQuery3.6.0 version, Dell G3 computer.
jquery implements the operation method of inputting only numbers and decimal points:
1. Reference the jQuery file in html:
<!DOCTYPE html> <html> <head> <script src="http://libs.baidu.com/jquery/2.0.0/jquery.js"></script> </head> </html>
2. Use the ".keypres()" method to control that the text box with class checkNum can only enter numbers and decimal points:
//监听键盘，只允许输入数字和小数点
$(".checkNum").keypress(function(event) {
var keyCode = event.which;
if (keyCode == 46 || (keyCode >= 48 && keyCode <=57) || keyCode == 8)//8是删除键
return true;
else
return false;
}).focus(function() {
this.style.imeMode='disabled';
});3. Process it through regular expressions:
/*JQuery 限制文本框只能输入数字和小数点*/
$(".NumDecText").keyup(function(){
$(this).val($(this).val().replace(/[^0-9.]/g,''));
}).bind(
"paste",function(){
$(this).val($(this).val().replace(/[^0-9.]/g,''));
//粘贴的不是数字，则替换为'' //或 return false; 禁用粘贴功能})
.css("ime-mode", "disabled");
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