1.输入大于0的正整数
<input
onkeyup=" if(this.value.length==1){ this.value=this.value.replace(/[^1-9]/g,'') }else{ this.value=this.value.replace(/\D/g,'') }"
onafterpaste=" if(this.value.length==1){ this.value=this.value.replace(/[^1-9]/g,'') }else{ this.value=this.value.replace(/\D/g,'') }">
2.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,'')" onafterpaste="this.value=this.value.replace(/\D/g,'')"
>
3.只能输入数字,能输小数点.
<input
onkeyup=" if(isNaN(value)) execCommand('undo')
" onafterpaste="
if(isNaN(value))
execCommand('undo')
"> <input name=txt1 onchange="
if(/\D/.test(this.value)){
alert('只能输入数字');
this.value='';
}">
4.数字和小数点方法二(封装成单独的函数)
function keyPress(ob) {
if (!ob.value.match(/^[\+\-]?\d*?\.?\d*?$/))if (ob.value.match(/^(?:[\+\-]?\d+(?:\.\d+)?)?$/)) ob.o_value = ob.value;
}
function keyUp(ob) {
if (!ob.value.match(/^[\+\-]?\d*?\.?\d*?$/)) ob.value = ob.t_value; else ob.t_value = ob.value; if (ob.value.match(/^(?:[\+\-]?\d+(?:\.\d+)?)?$/)) ob.o_value = ob.value;
}
function onBlur(ob) {
if(!ob.value.match(/^(?:[\+\-]?\d+(?:\.\d+)?|\.\d*?)?$/))ob.value=ob.o_value;else{if(ob.value.match(/^\.\d+$/))ob.value=0+ob.value;if(ob.value.match(/^\.$/))ob.value=0;ob.o_value=ob.value};
}
只需在调用,传入this对象即可!
5.只能输入字母和汉字
<input onkeyup="value=value.replace(/[\d]/g,'') "onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[\d]/g,''))" maxlength=10 name="Numbers">
6.只能输入英文字母和数字,不能输入中文
<input onkeyup="value=value.replace(/[^\w\.\/]/ig,'')">
7.只能输入数字和英文
<input onKeyUp="value=value.replace(/[^\d|chun]/g,'')">
8.小数点后只能有最多两位(数字,中文都可输入),不能输入字母和运算符号:
<input onKeyPress="
if((event.keyCode<48 || event.keyCode>57) && event.keyCode!=46 || /\.\d\d$/.test(value))
event.returnValue=false
">
9.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).*$/,'$1$2.$3')">