HTML5输入类型=数字应仅允许无符号整数

Question

How to prevent other number related characters other than unsigned integer

For example - e . ..etc

Demo: http://codepen.io/anon/pen/jrEGrK

 <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet"/> <form action="#" class="container"> <br /> <br /> <br /> <input class="form-control" onkeyup="value=isNaN(parseFloat(value))?1000:value" type="number" value="0"> </form> 

Answer 1

如果您对HTML5没问题，为什么不使用pattern属性并定义仅数字的正则表达式？

<input pattern="[1-9][0-9]*" ...>

Answer 2

 function validate(e) { var ev = e || window.event; var key = ev.keyCode || ev.which; key = String.fromCharCode( key ); var regex = /[0-9]/; if( !regex.test(key) ) { ev.returnValue = false; if(ev.preventDefault) ev.preventDefault(); } } 

 <input type='text' onkeypress='validate(event)' /> 

Answer 3

从实现中获取线索，如果使用这样的正则表达式怎么办：

onkeyup="value=/^\d+$/.test(value)?value:1000"