数字と英数字の組み合わせのみを入力できるhtml入力ボックスについて詳しく紹介します。

<input onkeyup="this.value=this.value.replace(/\D/g,&#39;&#39;)" onafterpaste="this.value=this.value.replace(/\D/g,&#39;&#39;)">

<input onkeyup="if(isNaN(value))execCommand(&#39;undo&#39;)"
onafterpaste="if(isNaN(value))execCommand(&#39;undo&#39;)">
<input name=txt1 onchange="if(/\D/.test(this.value)){alert(&#39;只能输入数字&#39;);this.value=&#39;&#39;;}">

<input type=text t_value="" o_value="" onkeypress="if(!this.value.match(/^[\+\-]?\d*?\.?\d*?$/))
this.value=this.t_value;else this.t_value=this.value;
if(this.value.match(/^(?:[\+\-]?\d+(?:\.\d+)?)?$/))
this.o_value=this.value" onkeyup="if(!this.value.match(/^[\+\-]?\d*?\.?\d*?$/))
this.value=this.t_value;else this.t_value=this.value;
if(this.value.match(/^(?:[\+\-]?\d+(?:\.\d+)?)?$/))
this.o_value=this.value" onblur="if(!this.value.match(/^(?:[\+\-]?\d+(?:\.\d+)?|\.\d*?)?$/))
this.value=this.o_value;
else{if(this.value.match(/^\.\d+$/))this.value=0+this.value;
if(this.value.match(/^\.$/))this.value=0;
this.o_value=this.value}">

<input onkeyup="value=value.replace(/[\d]/g,&#39;&#39;) 
"onbeforepaste="clipboardData.setData(&#39;text&#39;,clipboardData.getData(&#39;text&#39;).replace(/[\d]/g,&#39;&#39;))" maxlength=10 name="Numbers">

<input onkeyup="value=value.replace(/[^\w\.\/]/ig,&#39;&#39;)">

<input onKeyUp="value=value.replace(/[^\d|chun]/g,&#39;&#39;)">

<input onKeyPress="if((event.keyCode<48 || event.keyCode>57) && event.keyCode!=46 || /\.\d\d$/.test(value))event.returnValue=false">

<input onkeyup="this.value=this.value.replace(/^(\-)*(\d+)\.(\d\d).*$/,&#39;$1$2.$3&#39;)">

<input type="text" onkeyup="this.value=this.value.replace(/[^\u4e00-\u9fa5]/g,&#39;&#39;)">

<input type="text" onkeyup="this.value=this.value.replace(/\D/g,&#39;&#39;)">

<input type="text" onkeyup="this.value=this.value.replace(/[^a-zA-Z]/g,&#39;&#39;)">

<input onkeyup="value=value.replace(/[^\w\u4E00-\u9FA5]/g, &#39;&#39;)">

<input class=input maxLength=12 size=15 name=username id="username" onKeyUp="value=value.replace(/[\W]/g,&#39;&#39;)">

<input type="text" onkeyup="this.value=this.value.replace(/^[^!@#$%^&*()-=+]/g,&#39;&#39;)">