js限制文本框只能輸入數字方法小結

2019-11-20 14:28:50

字體：大中小

來源：轉載

供稿：網友

有時需要限制文本框輸入內容的類型，本節分享下正則表達式限制文本框只能輸入數字、小數點、英文字母、漢字等代碼。

例如，輸入大于0的正整數

<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,'')}">

1，文本框只能輸入數字代碼(小數點也不能輸入)

<input onkeyup="this.value=this.value.replace(//D/g,'')" onafterpaste="this.value=this.value.replace(//D/g,'')">

2，只能輸入數字,能輸小數點. IE only

<input onkeyup="if(isNaN(value))execCommand('undo')" onafterpaste="if(isNaN(value))execCommand('undo')">
<input name=txt1 onchange="if(//D/.test(this.value)){alert('只能輸入數字');this.value='';}">

3，數字和小數點方法二

<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}">

封裝成單獨的函數：

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};}

只需在調用，傳入this對象即可!

4，只能輸入字母和漢字

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

5，只能輸入英文字母和數字,不能輸入中文