Parsing the html input box can only enter numbers and alphanumerics

JS判断只能是数字和小数点

1.文本框只能输入数字代码(小数点也不能输入)

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

2.只能输入数字,能输小数点.

<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;;}">

3.数字和小数点方法二

<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}">

4.只能输入字母和汉字

<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">

5.只能输入英文字母和数字,不能输入中文

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

6.只能输入数字和英文c652ae2fea3284692ca5068492eba1fdchune6e38b3c62e8df885fe2e3986461aa63

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

7.小数点后只能有最多两位(数字,中文都可输入),不能输入字母和运算符号:

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

8.小数点后只能有最多两位(数字,字母,中文都可输入),可以输入运算符号:

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

输入中文:  

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

输入数字: 

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

输入英文:  

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

三个合在一起  

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

只输入数字和字母  

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

除了英文的标点符号以为 其他的人都可以中文，英文字母，数字，中文标点

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

   

The above is the detailed content of Parsing the html input box can only enter numbers and alphanumerics. For more information, please follow other related articles on the PHP Chinese website!