[英]JSP form still submitting even though JavaScript validation returning false
[英]Form gets submited even though JS function is returning false
下面是我從 html 源代碼中獲取的代碼片段:
<FORM id=SubmitLogon method=post name=submitLogonForm action=/MyLogin/SubmitLogon.do;jsessionid=reQYQqPCZt_6Oc3EkU66XFiC-fWQQ2DHPdCgWYwR5TbT9xsXOsPe!907086402 AutoComplete="off">
<TR>
<TD class=logonLabelTdTag>Username </TD>
<TD align=left>
<DIV id=wwgrp_username_Id class=wwgrp>
<DIV id=wwctrl_username_Id class=wwctrl>
<INPUT onchange="javascript: this.value=this.value.toUpperCase();" tabIndex=1 onfocus="javascript: this.value=this.value.toUpperCase();" id=username_Id class=logonTextBox maxLength=40 name=username>
</DIV>
</DIV>
</TD>
</TR>
<TR>
<SCRIPT language=JavaScript1.2 type=text/javascript>
$(document).ready(function () {
try {
$("input[type='text']").each(function(){
$(this).attr("autocomplete","off");
});
}
catch (e)
{ }
});
</SCRIPT>
<TD class=logonLabelTdTag>Password </TD>
<TD align=left>
<DIV id=wwgrp_password_Id class=wwgrp>
<DIV id=wwctrl_password_Id class=wwctrl>
<INPUT tabIndex=2 id=password_Id class=logonTextBox maxLength=40 type=password value="" name=password>
</DIV>
</DIV>
</TD>
</TR>
<TR>
<TD colSpan=2 align=right>
<BUTTON onclick=validateLoginCredentials() style="BORDER-TOP-STYLE: none; BORDER-LEFT-STYLE: none; HEIGHT: 39px; WIDTH: 98px; BACKGROUND: none transparent scroll repeat 0% 0%; BORDER-BOTTOM-STYLE: none; BORDER-RIGHT-STYLE: none" type=submit value="Loginn">
<IMG src="https://den02qoj.us.oracle.com/images/btn_login.jpg">
</BUTTON>
</TD>
</TR>
</FORM>
<script>
function validateLoginCredentials(){
alert('invoked');
var usernameVar = document.getElementById("username_Id").value;
var passwordVar = document.getElementById("password_Id").value;
//validationIdd_user
//validationIdd_password
alert('usernameVar is:'+usernameVar);
alert('passwordVar is:'+passwordVar);
alert('usernameVar length is:- '+usernameVar.length);
alert('passwordVar length is:- '+passwordVar.length);
document.getElementById("validationIdd").style.visibility = 'hidden';
document.getElementById("validationIdd_user").style.visibility = 'hidden';
document.getElementById("validationIdd_password").style.visibility = 'hidden';
if(usernameVar == '' && passwordVar == ''){
document.getElementById("validationIdd").style.display='';
alert('517-false');
return false;
}else if(usernameVar == '' || usernameVar == null){
document.getElementById("validationIdd").style.visibility = 'hidden';
document.getElementById("validationIdd_password").style.visibility = 'hidden';
document.getElementById("validationIdd_user").style.display='';
alert('523-false');
return false;
}else if(passwordVar == '' || passwordVar == null){
document.getElementById("validationIdd_password").style.display='';
alert('527-false');
return false;
}else{
alert('530-true submitting now----------------');
document.getElementById('SubmitLogon').submit()
return true;
}
alert('validateLoginCredentials:end');
}
</script>
第一次點擊提交按鈕
當username(id:username_Id)
和password(id:password_Id)
都為空時,JS 函數validateLoginCredentials()
返回 false 這我通過alert('517-false');
但表格已提交。
再次當我第二次點擊提交按鈕時
username(id:username_Id)
和password(id:password_Id)
都是空的 JS 函數validateLoginCredentials()
被調用但它沒有進入下面的塊(這是我上面描述的第一個場景)。
if(usernameVar == '' && passwordVar == ''){
document.getElementById("validationIdd").style.display='';
alert('517-false');
return false;
}
為什么相同(以上)場景有不同的結果,為什么即使 JS 函數返回 false,表單也會在第一個場景中提交?
請幫幫我。
您必須將檢查功能放在表單標簽中,而不是放在按鈕中
<FORM id=SubmitLogon method=post onsubmit="return validateLoginCredentials()" name=submitLogonForm action=/MyLogin/SubmitLogon.do;jsessionid=reQYQqPCZt_6Oc3EkU66XFiC-fWQQ2DHPdCgWYwR5TbT9xsXOsPe!907086402 AutoComplete="off">
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