js驗證表單 驗證空值 長度，過濾非數字等
阿新 • • 發佈：2019-01-22
3、<!-- 驗證表單的js提交方式會不一樣 -->
<script type="text/javascript">
function checkFormSubmit(form){
if(form.username.value == ""){
alert("請輸入賬號");
form.username.focus();
return false;
}
if(form.password.value == ""){
alert("請輸入密碼");
form.password.focus();
return false;
}
document.jvForm.submit();
}
</script>
<form name="jvForm"
賬號：<input name="username" id="username" type="text"/><br/>
密碼：<input name="password" id="password" type="text"/>
<input type="button" value="登入" onclick="checkFormSubmit(this.form)"/>
</form>
<script type="text/javascript">
function checkFormSubmit(form){
if(form.username.value == ""){
alert("請輸入賬號");
form.username.focus();
return false;
}
if(form.password.value == ""){
alert("請輸入密碼");
form.password.focus();
return false;
}
document.jvForm.submit();
}
</script>
<form name="jvForm"
賬號：<input name="username" id="username" type="text"/><br/>
密碼：<input name="password" id="password" type="text"/>
<input type="button" value="登入" onclick="checkFormSubmit(this.form)"/>
</form>