jsp表单验证汇总

js验证表单大全js验证radio是否选择 <script language="javascript">function checkform(obj){for(i=0;i<obj.oo.length;i++) if(obj.oo[i].checked==true) return true; alert("请选择")return false; }</script><form id="form1" name="form1" method="post" action="" onsubmit="return checkform(this)"> <input type="radio" name="oo" value="radiobutton" /> <input type="radio" name="oo" value="radiobutton" /> <input type="submit" name="Submit" value="提交" /></form> 1. 长度限制<script>function test() {if(document.a.b.value.length>50){alert("不能超过50个字符！");document.a.b.focus();return false;}}</script><form name=a onsubmit="return test()"><textarea name="b" cols="40" wrap="VIRTUAL" rows="6"></textarea><input type="submit" name="Submit" value="check"></form> 2. 只能是汉字 <input onkeyup="value="/oblog/value.replace(/[^\u4E00-\u9FA5]/g,'')">3." 只能是英文<script language=javascript>function onlyEng(){if(!(event.keyCode>=65&&event.keyCode<=90))event.returnvalue=false;}</script><input onkeydown="onlyEng();">4. 只能是数字<script language=javascript>function onlyNum(){if(!((event.keyCode>=48&&event.keyCode<=57) (event.keyCode>=96&&event.keyCode<=105)))//考虑小键盘上的数字键event.returnvalue=false;}</script><input onkeydown="onlyNum();">5. 只能是英文字符和数字<input onkeyup="value="/oblog/value.replace(/[\W]/g,"'') "onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))">6. 验证油箱格式<SCRIPT LANGUAGE=javascript RUNAT=Server>function isEmail(strEmail) {if (strEmail.search(/^\w+((-\w+) (\.\w+))*\@[A-Za-z0-9]+((\. -)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) != -1)return true;elsealert("oh");}</SCRIPT><input type=text onblur=isEmail(this.value)>7. 屏蔽关键字(这里屏蔽***和****)<script language="javascript1.2">function test() {if((a.b.value.indexOf ("***") == 0) (a.b.value.indexOf ("****") == 0)){alert("");a.b.focus();return false;}}</script><form name=a onsubmit="return test()"><input type=text name=b><input type="submit" name="Submit" value="check"></form>8. 两次输入密码是否相同<FORM METHOD=POST ACTION=""><input type="password" id="input1"><input type="password" id="input2"><input type="button" value="test" onclick="check()"></FORM><script>function check(){ with(document.all){if(input1.value!=input2.value){alert("false")input1.value = "";input2.value = "";}else document.forms[0].submit();}}</script>够了吧 屏蔽右键 很酷 oncontextmenu="return false" ondragstart="return false" onselectstart="return false"加在body中二2.1 表单项不能为空<script language="javascript"><!--function CheckForm(){ if (document.form.name.value.length == 0) { alert("请输入您姓名!");document.form.name.focus();return false;}return true;}--></script>