Form validation before Submit - php

Question

I have the following form that needs to feed into the database but I would like it to be validated before it can be saved into the database :
<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>
And the submit is done by a jquery script using the following script :
<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>
How can I put form validation to check if input is empty before submitting it into the script?

Answer 1

I am using javascript to do the validations.
Following is the form code:
<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>
To perform validation write a javascript function:
<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>

Answer 2

You are using,
<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>
Here, submit button is used for submitting a form and will never trigger click event. Because, submit will be triggered first thus causing the click event skip.
$('#add_walkin_patient_button').on('click', function (e) {
This would have worked if you have used normal button instead of submit button
<input type="button">Submit</button>
Now to the problem. There are two solution for it ,
If you use click event, then you should manually trigger submit on correct validation case,
<input type="button" id="add_walkin_patient_button">Submit</button>
//JS :
$("#add_walkin_patient_button").click(function() {
if(valid){
$("#form-id").submit();
}
Another option is to use submit event;which is triggered just after you click submit button. Here you need to either allow form submit or halt it based on your validation criteria,
$("#form-id").submit(function(){
if(invalid){
//Suppress form submit
return false;
}else{
return true;
}
});
P.S
And i would recommend you to use jQuery Validate as suggested by #sherin-mathew

Answer 3

make a javascript validation method (say, validateForm(), with bool return type). add [onsubmit="return validateForm()"] attribute to your form and you are done.

Answer 4

You need to prevent default action.
$('#add_walkin_patient_form').on('submit', function(e) {
e.preventDefault();
//Validate form and submit
});

Answer 5

<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 Terms and Conditions</label>
</div>
<div class="checkbox">
<label><input type="checkbox"> I agree to recieve Email Terms and Conditions</label>
</div>
<div class="checkbox">
<label><input type="checkbox"> I agree to recieve SMS Terms and Conditions</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>

Answer 6

I think you should use type button
and then eventClick function of jquery