HTML中控制input文字框輸入內容
阿新 • • 發佈:2021-02-07
1.控制input只能輸入正整數
<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.只能輸入正整數
<input
onkeyup="this.value=this.value.replace(/\D/g,'')"
onafterpaste="this.value=this.value.replace(/\D/g,'')">
3.只能輸入數字(可輸入小數點)
<input
onkeyup="if(isNaN(value))execCommand('undo')"
onafterpaste="if(isNaN(value))execCommand('undo')" >
4.只能輸入數字(可輸入小數點)
<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(/^\.$/))this.value=0;this.o_value=this.value}">
封裝成單獨的函式:
function keyPress(ob) {
if (!ob.value.match(/^[\+\-]?\d*?\.?\d*?$/)) ob.value = ob.t_value; else ob.t_value = ob.value; if (ob.value.match(/^(?:[\+\-]?\d+(?:\.\d+)?)?$/)) ob.o_value = ob.value;
}
<!--輸入時校驗-->
function keyUp(ob) {
if (!ob.value.match(/^[\+\-]?\d*?\.?\d*?$/)) ob.value = ob.t_value; else ob.t_value = ob.value; if (ob.value.match(/^(?:[\+\-]?\d+(?:\.\d+)?)?$/)) ob.o_value = ob.value;
}
<!--失去焦點時校驗-->
function onBlur(ob) {
if(!ob.value.match(/^(?:[\+\-]?\d+(?:\.\d+)?|\.\d*?)?$/))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.只能輸入字母和漢字及其他符號,不能輸入數字
<input
onkeyup="value=value.replace(/[\d]/g,'')"
onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[\d]/g,''))"
maxlength=10
name="Numbers">
6.只能輸入英文字母和數字(包含小數點)
<input onkeyup="value=value.replace(/[^\w\.\/]/ig,'')">
7.只能輸入數字和字母
<input onKeyUp="value=value.replace(/[\W]/g,'')">
8.小數點後最多隻能有兩位小數(數字、中文均可輸入),不能輸入字母和運算子號
<input onKeyPress="if((event.keyCode<48 || event.keyCode>57) && event.keyCode!=46 || /\.\d\d$/.test(value))event.returnValue=false">
9.小數點後只能有最多兩位小數(數字、字母、中文均可輸入),可以輸入運算子號
<input onkeyup="this.value=this.value.replace(/^(\-)*(\d+)\.(\d\d).*$/,'$1$2.$3')">
參考文章: