JS限制文本框输入数字
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
<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(/^\.$/))this.value=0;this.o_value=this.value}”>
总结：封装成单独的函数
function keyPress(ob) {
if (!ob.value.match(/^[\+\-]?\d*?\.?\d*?$/)) ob.value = ob.t_value; else ob.t_value = ob.value; if (ob.value.match(/^(?:[\+\-]?\d+(?:\.\d+)?)?$/)) ob.o_value = ob.value;
}
function keyUp(ob) {
if (!ob.value.match(/^[\+\-]?\d*?\.?\d*?$/)) 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};
}
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\’)”>