问题
I’m trying to implement an order entry form using ASP.NET MVC but facing a lot of difficulties. All the samples that I found are related to viewing master detail forms, and none for adding or editing.
Suppose I have two tables: Order and OrderLines that are related to each others with one-to-many relationship. In the main view I had a “New” button when clicked it should show a new order view composed of the order fields, a grid that shows the order lines, and a “Save” button that when clicked will persist the whole order along with its lines into a database. The grid should have three buttons: “Add Line”, “Edit Line”, and “Delete Line”. When the “Add Line” is clicked a new view should be shown that allows the user to add the line to the order view grid lines –at this stage the database is not affected-. When the user clicks “Edit Line” a view will be shown that allows the user to edit the selected line and when done update the order grid lines.
The most difficult problems are:
How to pass the order and its lines collection between the order view and the order line views?
How to update the order view based on changes in the order line view?
And how to persist changes between views without the database being involved?
Is there a concrete example that shows how to implement this using MVC?
Your help and feedback is appreciated.
回答1:
Pleas have a look at my blog post on creating master detail form in asp.net mvc. it also contains demo project that you can download
回答2:
Unlike WebForms, ASP.NET MVC does not try to hide the stateless nature of HTTP. To work with a complex object across multiple forms you have a couple of options:
- Save the object on the server with each change so that the updated object is available using only an id
- Use jquery to populate the order line form and save details to the main form
I usually go with the client side option myself, with the main form having hidden fields for the data that will be edited in the subform. You may find the server side option easier though - if you really don't want to involve the database you can keep your partially updated object in the session.
回答3:
Step 1: Create view model
public class OrderVM
{
public string OrderNo { get; set; }
public DateTime OrderDate { get; set; }
public string Description { get; set; }
public List<OrderDetail> OrderDetails {get;set;}
}
Step 2: Add javascript for add order lines
<script src="//code.jquery.com/ui/1.11.4/jquery-ui.js"></script>
$(function () {
$('#orderDate').datepicker({
dateFormat : 'mm-dd-yy'
});
});
$(document).ready(function () {
var orderItems = [];
//Add button click function
$('#add').click(function () {
//Check validation of order item
var isValidItem = true;
if ($('#itemName').val().trim() == '') {
isValidItem = false;
$('#itemName').siblings('span.error').css('visibility', 'visible');
}
else {
$('#itemName').siblings('span.error').css('visibility', 'hidden');
}
if (!($('#quantity').val().trim() != '' && !isNaN($('#quantity').val().trim()))) {
isValidItem = false;
$('#quantity').siblings('span.error').css('visibility', 'visible');
}
else {
$('#quantity').siblings('span.error').css('visibility', 'hidden');
}
if (!($('#rate').val().trim() != '' && !isNaN($('#rate').val().trim()))) {
isValidItem = false;
$('#rate').siblings('span.error').css('visibility', 'visible');
}
else {
$('#rate').siblings('span.error').css('visibility', 'hidden');
}
//Add item to list if valid
if (isValidItem) {
orderItems.push({
ItemName: $('#itemName').val().trim(),
Quantity: parseInt($('#quantity').val().trim()),
Rate: parseFloat($('#rate').val().trim()),
TotalAmount: parseInt($('#quantity').val().trim()) * parseFloat($('#rate').val().trim())
});
//Clear fields
$('#itemName').val('').focus();
$('#quantity,#rate').val('');
}
//populate order items
GeneratedItemsTable();
});
//Save button click function
$('#submit').click(function () {
//validation of order
var isAllValid = true;
if (orderItems.length == 0) {
$('#orderItems').html('<span style="color:red;">Please add order items</span>');
isAllValid = false;
}
if ($('#orderNo').val().trim() == '') {
$('#orderNo').siblings('span.error').css('visibility', 'visible');
isAllValid = false;
}
else {
$('#orderNo').siblings('span.error').css('visibility', 'hidden');
}
if ($('#orderDate').val().trim() == '') {
$('#orderDate').siblings('span.error').css('visibility', 'visible');
isAllValid = false;
}
else {
$('#orderDate').siblings('span.error').css('visibility', 'hidden');
}
//Save if valid
if (isAllValid) {
var data = {
OrderNo: $('#orderNo').val().trim(),
OrderDate: $('#orderDate').val().trim(),
//Sorry forgot to add Description Field
Description : $('#description').val().trim(),
OrderDetails : orderItems
}
$(this).val('Please wait...');
$.ajax({
url: '/Home/SaveOrder',
type: "POST",
data: JSON.stringify(data),
dataType: "JSON",
contentType: "application/json",
success: function (d) {
//check is successfully save to database
if (d.status == true) {
//will send status from server side
alert('Successfully done.');
//clear form
orderItems = [];
$('#orderNo').val('');
$('#orderDate').val('');
$('#orderItems').empty();
}
else {
alert('Failed');
}
$('#submit').val('Save');
},
error: function () {
alert('Error. Please try again.');
$('#submit').val('Save');
}
});
}
});
//function for show added items in table
function GeneratedItemsTable() {
if (orderItems.length > 0) {
var $table = $('<table/>');
$table.append('<thead><tr><th>Item</th><th>Quantity</th><th>Rate</th><th>Total</th></tr></thead>');
var $tbody = $('<tbody/>');
$.each(orderItems, function (i, val) {
var $row = $('<tr/>');
$row.append($('<td/>').html(val.ItemName));
$row.append($('<td/>').html(val.Quantity));
$row.append($('<td/>').html(val.Rate));
$row.append($('<td/>').html(val.TotalAmount));
$tbody.append($row);
});
$table.append($tbody);
$('#orderItems').html($table);
}
}
});
</script>
Step 3: Create an action for save data
[HttpPost]
public JsonResult SaveOrder(OrderVM O)
{
bool status = false;
if (ModelState.IsValid)
{
using (MyDatabaseEntities dc = new MyDatabaseEntities())
{
Order order = new Order { OrderNo = O.OrderNo, OrderDate = O.OrderDate, Description = O.Description };
foreach (var i in O.OrderDetails)
{
//
// i.TotalAmount =
order.OrderDetails.Add(i);
}
dc.Orders.Add(order);
dc.SaveChanges();
status = true;
}
}
else
{
status = false;
}
return new JsonResult { Data = new { status = status} };
}
you can download source code and video tutorial
回答4:
You could try Telericks free MVC grid control...
http://demos.telerik.com/aspnet-mvc/grid/hierarchyserverside
回答5:
Just off the top of my head (a kind of brain dump)...
You could have a main grid part of the form. This would be full view loaded from an action (either with an order number or not depending on loading an existing one or not).
When clicking an event (new or edit) this could open a partial view in a "lightbox" style. This would then pass back a json object back to the main form.
The passed json object would then be rendered using templating to the bottom of the table (for a new one) or update an existing record. This could also be saved back to the server in the same ajax call. Or just update the client side and need the user to click a save button.
An isDirty flag will be needed so any changes set it to true and the when the browser tries to leave or close etc. then you can prompt the user to save or not.
Hope this helps.
edit
Not tried this but could be interesting with the none db aspect of your question click
回答6:
Step 3: Create an action for save data. [HttpPost]
public JsonResult SaveOrder(OrderVM O)
{
bool status = false;
if (ModelState.IsValid)
{
using (ManageMobileStoreWebContext dc = new ManageMobileStoreWebContext())
{
//Random rnd = new Random();
//OrderID = rnd.Next(),
Order order = new Order { OrderNo = O.OrderNo, OrderDate = O.OrderDate, Description = O.Description };
foreach (var i in O.OrderDetails)
{
if(order.OrderDetails == null)
{
order.OrderDetails = new List<OrderDetail>();
}
// i.TotalAmount =
order.OrderDetails.Add(i);
//dc.OrderDetails.Add(i);
}
dc.Orders.Add(order);
dc.SaveChanges();
status = true;
}
}
else
{
status = false;
}
return new JsonResult { Data = new { status = status } };
}
来源：https://stackoverflow.com/questions/4646340/asp-net-mvc-master-detail-entry-form