我有以下需要提供给数据库的表单，但我希望在将其保存到数据库之前进行验证：
<form name="add_walkin_patient_form" class="add_walkin_patient_form" id="add_walkin_patient_form" autocomplete="off" >
<div class="form-line">
<div class="control-group">
<label class="control-label">
Patient Name
</label>
<div class="controls">
<input type="text" name="patientname" id="patientname" required="" value=""/>
</div>
</div>
<div class="control-group">
<label class="control-label">
Patient Phone Number
</label>
<div class="controls">
<input type="text" name="patient_phone" id="patient_phone" required="" value=""/>
</div>
</div>
<div class="control-group">
<label class="control-label">
Department
</label>
<div class="controls">
<select name="department" required="" class="department" id="department">
<option value="">Please select : </option>
<option value="Pharmacy">Pharmacy</option>
<option value="Laboratory">Laboratory</option>
<option value="Nurse">Nurse</option>
</select>
</div>
</div>
</div>
<button name="add_walkin_patient_button" type="submit" id="add_walkin_patient_button" class="btn add_walkin_patient_button btn-info pull-right">
Add Walk In Patient
</button>
</form>
使用以下脚本通过jquery脚本完成提交：
<script type="text/javascript">
$(document).ready(function () {
//delegated submit handlers for the forms inside the table
$('#add_walkin_patient_button').on('click', function (e) {
e.preventDefault();
//read the form data ans submit it to someurl
$.post('<?php echo base_url() ?>index.php/reception/add_walkin', $('#add_walkin_patient_form').serialize(), function () {
//success do something
// $.notify("New Patient Added Succesfully", "success",{ position:"left" });
$(".add_walkin_patient_form").notify(
"New Walkin Patient Added Successfully",
"success",
{position: "center"}
);
setInterval(function () {
var url = "<?php echo base_url() ?>index.php/reception/";
$(location).attr('href', url);
}, 3000);
}).fail(function () {
//error do something
$(".add_walkin_patient_form").notify(
"There was an error please try again later or contact the system support desk for assistance",
"error",
{position: "center"}
);
})
})
});
</script>
如何在将输入提交到脚本之前进行表单验证以检查输入是否为空？
答案 0 :(得分：1)
您正在使用，
<button name="add_walkin_patient_button" type="submit" id="add_walkin_patient_button" class="btn add_walkin_patient_button btn-info pull-right">
Add Walk In Patient
</button>
此处，submit按钮用于提交表单，永远不会触发点击事件。因为，首先会触发提交，从而导致click事件跳过。
$('#add_walkin_patient_button').on('click', function (e) {
如果您使用normal按钮而不是submit按钮
<input type="button">Submit</button>
现在问题。它有两个解决方案，
如果您使用点击事件，那么您应该在正确的验证案例中手动触发提交，
<input type="button" id="add_walkin_patient_button">Submit</button>
//JS :
$("#add_walkin_patient_button").click(function() {
if(valid){
$("#form-id").submit();
}
另一种选择是使用submit事件;这是在您单击提交按钮后触发的事件。在这里，您需要允许表单提交或根据您的验证标准暂停它，
$("#form-id").submit(function(){
if(invalid){
//Suppress form submit
return false;
}else{
return true;
}
});
P.S
我建议您按jQuery Validate
的建议使用@sherin-mathew答案 1 :(得分：0)
使用bool返回类型创建一个javascript验证方法（例如，validateForm（））。将[onsubmit =＆＃34; return validateForm（）＆＃34;]属性添加到表单中，您就完成了。
答案 2 :(得分：0)
您需要阻止默认操作。
$('#add_walkin_patient_form').on('submit', function(e) {
e.preventDefault();
//Validate form and submit
});
答案 3 :(得分：0)
我正在使用javascript进行验证。 以下是表单代码：
<form action="upload.php" method="post" onSubmit="return validateForm()">
<input type="text" id="username">
<input type="text" password="password">
<input type="submit" value='Login' name='login'>
</form>
要执行验证，请编写javascript函数：
<script>
function checkform(){
var uname= document.getElementById("username").value.trim().toUpperCase();
if(uname=== '' || uname=== null) {
alert("Username is blank");
document.getElementById("username").backgroundColor = "#ff6666";
return false;
}else document.getElementById("username").backgroundColor = "white";
var pass= document.getElementById("password").value.trim().toUpperCase();
if(pass=== '' || pass=== null) {
alert("Password is blank");
document.getElementById("password").backgroundColor = "#ff6666";
return false;
}else document.getElementById("password").backgroundColor = "white";
return true;
}
</script>
答案 4 :(得分：0)
<html>
<head>
<title></title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
<!-- jQuery library -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<!-- Popper JS -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"></script>
<!-- Latest compiled JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
</head>
<body>
<style>
#first{
display: none;
}
</style>
<div class="container"><br>
<div class="col-lg-6 m-auto d-block">
<form action="" method="" onsubmit="return validation()" class="bg-light">
<div class="form-group">
<label for="">Title</label>
<span class="text-danger">*</span>
<!-- <input class="form-control" type="text" > -->
<select name="title" id="title" class="form-control" >
<option value=""class="form-control" >Select</option>
<option value="Mr" class="form-control">Mr</option>
<option value="Mrs" class="form-control">Mrs</option>
</select>
<span id="tit" class="text-danger font-weight-bold"> </span>
</div>
<div class="form-group">
<div class="row">
<div class="col">
<label for="firstName">FirstName</label>
<span class="text-danger">*</span>
<input type="text" class="form-control" placeholder="First name" id="firstName" >
<span id="first" class="text-danger font-weight-bold"> </span>
</div>
<div class="col">
<label for="lastName">LastName</label>
<span class="text-danger">*</span>
<input type="text" class="form-control" placeholder="Last name" id="lastName">
<span id="last" class="text-danger font-weight-bold"> </span>
</div>
</div>
</div>
<div class="form-group">
<label for="email">Your Email</label>
<span class="text-danger">*</span>
<input type="text" class="form-control" placeholder="Email" id="email">
<span id="fillemail" class="text-danger font-weight-bold"> </span>
</div>
<div class="form-group">
<label for="contact">Your Contact</label>
<span class="text-danger">*</span>
<input type="text" class="form-control" placeholder="Contact Number" id="contact">
<span id="con" class="text-danger font-weight-bold"> </span>
</div>
<div class="form-group">
<label for="password">Your Password</label>
<span class="text-danger">*</span>
<input type="text" class="form-control" placeholder="Password" id="password">
<span id="pass" class="text-danger font-weight-bold"> </span>
</div>
<div class="form-group">
<label for="conPassword">Confirm Password</label>
<span class="text-danger">*</span>
<input type="text" class="form-control" placeholder="Password" id="conPassword">
<span id="conPass" class="text-danger font-weight-bold"> </span>
</div>
<div class="checkbox">
<label><input type="checkbox"> I accept <a href="form.html">Terms and Conditions</a></label>
</div>
<div class="checkbox">
<label><input type="checkbox"> I agree to recieve Email <a href="form2.html">Terms and Conditions</a></label>
</div>
<div class="checkbox">
<label><input type="checkbox"> I agree to recieve SMS <a href="form2.html">Terms and Conditions</a></label>
</div>
<input type="submit" name="submit" value="SignUp" id="signUp" class="btn btn-success" autocomplete="off">
</form><br><br>
</div>
</div>
<script type="text/javascript">
function validation(){
var title = document.getElementById('title').value;
var firstName = document.getElementById('firstName').value;
var email=document.getElementById('email').value;
var contact=document.getElementById('contact').value;
var password=document.getElementById('password').value;
var conPassword=document.getElementById('conPassword').value;
var signBut=document.getElementById('signUp');
console.log(firstName);
if(title == ""){
document.getElementById("tit").innerHTML =" Please select the title feild first field";
return false;
}
// if(firstName == "" & firstName.length<=3){
// document.getElementById("first").innerHTML =" Please Enter First Name";
// return false;
// document.getElementById("signUp").addEventListener("click", function(event){
// event.preventDefault()
// });
// }
signBut.addEventListener('click',function(e){
if(firstName=="" & firstName<3)
{
document.getElementById("first").innerHTML="Please Enter proper Name";
e.preventDefault();
}
},false);
if(lastName == ""){
document.getElementById("last").innerHTML =" Please Enter Last Name";
return false;
}
else if(email ==""){
document.getElementById("fillemail").innerHTML="Please Enter Email";
}
else if(contact ==""){
document.getElementById("con").innerHTML="Please Enter Your Contact";
}
else if(password ==""){
document.getElementById("pass").innerHTML="Please Enter Your Password";
}
else if(conPassword ==""){
document.getElementById("conPass").innerHTML="Please Confirm Password";
}
}
</script>
</body>
</html>
答案 5 :(得分：0)
我认为您应该使用类型按钮 然后是jquery的eventClick函数