表單驗證

1.文本框只能輸入數字代碼(小數點也不能輸入)
<input οnkeyup="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.
<input οnkeyup="if(isNaN(value))execCommand('undo')" onafterpaste="if(isNaN(value))execCommand('undo')">
<input name=txt1 οnchange="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="" οnkeypress="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" οnkeyup="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" οnblur="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(/^\.$/))this.value=0;this.o_value=this.value}">
4.只能輸入字母和漢字
<input οnkeyup="value=value.replace(/[\d]/g,'') "onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[\d]/g,''))" maxlength=10 name="Numbers">
5.只能輸入英文字母和數字,不能輸入中文
<input οnkeyup="value=value.replace(/[^\w\.\/]/ig,'')">
6.只能輸入數字和英文<font color="Red">chun</font>
<input onKeyUp="value=value.replace(/[^\d|chun]/g,'')">
7.小數點後只能有最多兩位(數字,中文都可輸入),不能輸入字母和運算符號:
<input onKeyPress="if((event.keyCode<48 || event.keyCode>57) && event.keyCode!=46 || /\.\d\d$/.test(value))event.returnValue=false">
8.小數點後只能有最多兩位(數字,字母,中文都可輸入),可以輸入運算符號:
<input οnkeyup="this.value=this.value.replace(/^(\-)*(\d+)\.(\d\d).*$/,'$1$2.$3')">
<input οnkeyup="value=value.replace(/[^\d\.]/g,'')">
<input type=text οnkeypress="return event.keyCode>=65" style="ime-mode:disabled">
<input type=text t_value="" o_value="" οnkeypress="if(!this.value.match(/^[\+\-]?\d*?\.?\d*?$/))this.value=this.t_value;else this.t_value=this.value;if(this.value.match(/^(?:[\+\-]?\d+(?:\.\d+)?)?$/))this.o_value=this.value" οnkeyup="if(!this.value.match(/^[\+\-]?\d*?\.?\d*?$/))this.value=this.t_value;else this.t_value=this.value;if(this.value.match(/^(?:[\+\-]?\d+(?:\.\d+)?)?$/))this.o_value=this.value" οnblur="if(!this.value.match(/^(?:[\+\-]?\d+(?:\.\d+)?|\.\d*?)?$/))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}">
<input οnkeyup="this.value=this.value.replace(/\D/g,'')" onafterpaste="this.value=this.value.replace(/\D/g,'')">
or
<input name=txt1 οnchange="if(/\D/.test(this.value)){alert('只能輸入數字');this.value='';}">
or
<input οnkeyup="if(isNaN(value))execCommand('undo')" onafterpaste="if(isNaN(value))execCommand('undo')">

限制文本框只能輸入數字包括小數點
<input οnkeyup="value=value.replace(/[^\d\.]/g,'')">
有關正則表達式 1.只能輸入數字和英文的： <input οnkeyup="value=value.replace(/[\W]/g,'') " onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))" ID="Text1" NAME="Text1">
2.只能輸入數字的： <input οnkeyup="value=value.replace(/[^\d]/g,'') " onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))" ID="Text2" NAME="Text2">
3.只能輸入全角的： <input οnkeyup="value=value.replace(/[^\uFF00-\uFFFF]/g,'')" onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\uFF00-\uFFFF]/g,''))" ID="Text3" NAME="Text3">
4.只能輸入漢字的： <input οnkeyup="value=value.replace(/[^\u4E00-\u9FA5]/g,'')" onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\u4E00-\u9FA5]/g,''))" ID="Text4" NAME="Text4">
移到輸入框時自動選擇: <input type="text" id="text1" name="text1" value="輸入檢索關鍵字" οnclick="javascript:this.form.text1.focus();this.form.text1.select();" maxlength="15" />