html表单验证代码 ASP中的表单验证实现方法

ASP中的表单验证实现方法  

　　在ASP程序中我们经常会要求用户填写一个表单 然后直接点发送按钮发送给我们 今天这个程序就是限制表单内容 然后再发送给我们

　　只是一个简单的实例 希望对大家编程有用

　　HTML表单

　　<form action= action asp method= post name= myform >Name and Surname: <br/><input type= text name= nameandsurname size= > <br/>Email: <br/><input type= text name= email size= > <br/>Age: <br/><input type= text name= age size= > <br/>Gender: <br/><select size= name= gender ><option> Select gender </option><option value= Male >Male</option><option value= Female >Female</option></select> <br/><input type= submit value= Submit onClick= check();return false; ></form>

　　其中Check()函数是用来检测表单内容的

　　JavaScript函数

　　<SCRIPT LANGUAGE= JavaScript TYPE= text/javascript >function check() {var nameandsurname = document myform nameandsurname;var email = document myform email;var age = document myform age;var gender = document myform gender;if ( nameandsurname value indexOf( ) == ) {alert( Enter your Name and Surname );nameandsurname focus();} else if ((email value indexOf( @ ) == ) || (email value indexOf( ) == )) {alert( Enter your valid email address );email focus();} else if (! (parseInt(age value) > )) {alert( Enter your Age );age focus();} else if (gender selectedIndex == ) {alert( Select your gender );gender focus();} else { document myform submit();}}</SCRIPT>