I want to put the interface with add,update, Delete ,Search Functions in JSP. Can we put one servlet for all the functions. I have allredy add the add function and I have done validation part for buttons separetly according to my requirement. I have added all the coding below. if we can’t have one servlet for all the actions how can i put separate actions in jquery.
<form id="form-sign-up" class="styled" action="DepartmentServlet" method="post">
<fieldset>
<h3>Department </h3>
<ol>
<li class="form-row"><label>Department Id:</label>
<input type="text" name="departmentId" id="departmentId" class="text-input required"/><span id="errmsg"></span>
</li>
<li class="form-row"><label>Department Name:</label>
<input type="text" name="departmentName" id="departmentName" class="text-input required"/>
</li>
<li class="form-row"><label>Department Head:</label>
<select name="departmentHead" class="text-input required" id="myDropdown"style="width: 158px"> <option value="">Select Department Head</option>
<%
String val = "";
Department dp = new Department();
ResultSet rs = dp.getHeadOfDepartment();
while (rs.next()) {
val = rs.getString(2);
%>
<option value="<%= val%>"><%= val%></option>
<%
}
%>
</select>
</li>
<li class="form-row"><label>Appointed Date:</label>
<input id="demo1" name="appointedDate"type="text" maxlength="25" size="25" class="text-input required"><a href="javascript:NewCal('demo1','ddmmmyyyy',true,24)"><img src="images/cal.gif" width="16" height="16" border="0" alt="Pick a date"></a>
<span class="descriptions">pick a date..</span>
</li>
<li class="button-row">
<input type="submit" value="ADD" class="btn-submit img-swap"/>
<input type="submit" value="Delete" class="btn-delete img-swap"/>
<input type="submit" value="Update" class="btn-update img-swap"/>
<input type="submit" value="Search" class="btn-search img-swap"/>
</li>
</ol>
</fieldset>
$(document).ready(function() {
$("#departmentId").keypress(function (e)
{
//if the letter is not digit then display error and don't type anything
if( e.which!=8 && e.which!=0 && (e.which<48 || e.which>57))
{
//display error message
$("#errmsg").html("Digits Only").show().fadeOut("slow");
return false;
}
});
$('.btn-delete').click(function(e){
// Declare the function variables:
// Parent form, form URL, email regex and the error HTML
var $formId = $(this).parents('form');
var formAction = $formId.attr('action');
var emailReg = /^([\w-\.]+@([\w-]+\.)+[\w-]{2,4})?$/;
var $error = $('<span class="error"></span>');
// Prepare the form for validation - remove previous errors
$('li',$formId).removeClass('error');
$('span.error').remove();
// Validate all inputs with the class "required"
$('.required',$formId).each(function(){
var inputVal = $("#departmentId").val();
var $parentTag = $("#departmentId").parent();
if(inputVal == ''){
$parentTag.addClass('error').append($error.clone().text('Required Field'));
}
// Run the email validation using the regex for those input items also having class "email"
// Check passwords match for inputs with class "password"
});
// All validation complete - Check if any errors exist
// If has errors
if ($('span.error').length > 0) {
$('span.error').each(function(){
// Set the distance for the error animation
var distance = 5;
// Get the error dimensions
var width = $(this).outerWidth();
// Calculate starting position
var start = width + distance;
// Set the initial CSS
$(this).show().css({
display: 'block',
opacity: 0,
right: -start+'px'
})
// Animate the error message
.animate({
right: -width+'px',
opacity: 1
}, 'slow');
});
} else {
$formId.submit();
}
// Prevent form submission
e.preventDefault();
});
// Fade out error message when input field gains focus
$('.required').focus(function(){
var $parent = $(this).parent();
$parent.removeClass('error');
$('span.error',$parent).fadeOut();
});
$('.btn-submit').click(function(e){
// Declare the function variables:
// Parent form, form URL, email regex and the error HTML
var $formId = $(this).parents('form');
var formAction = $formId.attr('action');
var emailReg = /^([\w-\.]+@([\w-]+\.)+[\w-]{2,4})?$/;
var $error = $('<span class="error"></span>');
// Prepare the form for validation - remove previous errors
$('li',$formId).removeClass('error');
$('span.error').remove();
// Validate all inputs with the class "required"
$('.required',$formId).each(function(){
var inputVal = $(this).val();
var $parentTag = $(this).parent();
if(inputVal == ''){
$parentTag.addClass('error').append($error.clone().text('Required Field'));
}
// Run the email validation using the regex for those input items also having class "email"
if($(this).hasClass('email') == true){
if(!emailReg.test(inputVal)){
$parentTag.addClass('error').append($error.clone().text('Enter valid email'));
}
}
// Check passwords match for inputs with class "password"
if($(this).hasClass('password') == true){
var password1 = $('#password-1').val();
var password2 = $('#password-2').val();
if(password1 != password2){
$parentTag.addClass('error').append($error.clone().text('Passwords must match'));
}
}
});
// All validation complete - Check if any errors exist
// If has errors
if ($('span.error').length > 0) {
$('span.error').each(function(){
// Set the distance for the error animation
var distance = 5;
// Get the error dimensions
var width = $(this).outerWidth();
// Calculate starting position
var start = width + distance;
// Set the initial CSS
$(this).show().css({
display: 'block',
opacity: 0,
right: -start+'px'
})
// Animate the error message
.animate({
right: -width+'px',
opacity: 1
}, 'slow');
});
} else {
$formId.submit();
}
// Prevent form submission
e.preventDefault();
});
// Fade out error message when input field gains focus
$('.required').focus(function(){
var $parent = $(this).parent();
$parent.removeClass('error');
$('span.error',$parent).fadeOut();
});
});
public class DepartmentServlet extends HttpServlet {
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//Getting the Value from the viewer
String sdepartmentId=request.getParameter("departmentId");
String departmentName=request.getParameter("departmentName");
String departmentHead=request.getParameter("departmentHead");
String dateTime=request.getParameter("appointedDate");
//Converting to the String department id to integer
Integer departmentId=Integer.parseInt(sdepartmentId);
Department dp=new Department();
dp.setAppDate(dateTime);
dp.setDepartHead(departmentHead);
dp.setDepartId(departmentId);
dp.setDepartName(departmentName);
try {
new Department().insertDepartment(dp);
} catch (SQLException ex) {
Logger.getLogger(DepartmentServlet.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
Well its a good practice to have one single servlet which behaves as a controller.
To make the “DepartmentServlet” as a single point servlet sufficing all the actions, below are few changes to be made in the above code
Add a hidden variable named action in the jsp / html page, inside the form tag, which contains the action to be performed when the corresponding button is pressed.
<input type="hidden" name="action" id="action" value=""/>write a jquery function which sets the value of action to the button clicked, for example when the add button is clicked call below snippet
$("#action").val('add')In the DepartmentServlet, retreive the action request parameter value