时间:2021-07-01 10:21:17 帮助过:21人阅读
function checkUser(){ var result = document.getElementById("userid").value; var password = document.getElementById("userpassid").value; if(result == "" ){ alert("用户名不能为空"); return false; } if(password == "" ){ alert("密码不能为空"); return false; }else{ return true; } }
在form表单里写成这样:
<form id="formid" name= "myform" method = 'post' action = 'user_login_submit.action' onsubmit = "return checkUser(); " > <table width="100%" border="0"> <tr> <td width="60" height="40" align="right">用户名 </td> <td><input type="text" value="" class="text2" name = "username" id = "userid"/></td> </tr> <tr> <td width="60" height="40" align="right">密 码 </td> <td><input type="password" value="" class="text2" name = "userpass" id = "userpassid"/></td> </tr> <tr> <td width="60" height="40" align="right"> </td> <td><p class="c4"> <input type="submit" value="" class="btn2" />
方法二:
function checkUser(){ var result = document.getElementById("userid").value; var password = document.getElementById("passid").value; if(result == "" ){ alert("用户名不能为空"); return false; } if(password == "" ){ alert("密码不能为空"); return false; } document.getElementById("formid").submit(); }
form表格的写法,需要写id
<form id="formid" method = 'post' action = 'user_login_submit.action' >
button按钮的写法如下:
<input type="button" value="" class="btn2" onclick = "checkUser();" />
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