DD Class3
Contents
Review HW
Basic Events
Button and controls can cause PostBack and can register their own events like OnClick
http://iam.colum.edu/dd/browser/browser.aspx?f=/classsource/events
OnCommand
Commands Rather than OnClick
http://iam.colum.edu/dd/classsource/events/Command.aspx
http://iam.colum.edu/dd/gbrowser.php?file=/classsource/events/Command.aspx.cs
Labels and Panels
demo labels and innerHtml on regular html tags
Control Loops
List Controls
List Controls .Items check .Checked to find Checked controls
Looping through the Items collection in a ListControl. Example In Class!!!
Dynamically Adding Contols
//Adding Controls at run time
Button b = new Button();
b.ID = "Button2";
b.Text = "Added Button";
b.Click += new EventHandler(b_Click);
Panel1.Controls.Add(b);
Questions?
VPN how to connect via VPN. You have all access to our network off campus. VPN will allow you to use local machine names iamdbv.iam.local or siam2.iam.local from off campus.
http://imamp.colum.edu/mediawiki/index.php/IAM_VPN
Validators
Validating Input
Using aspx validators
Types of validations and error messages
http://msdn2.microsoft.com/en-us/library/aa479045.aspx
Require Field Validator
<asp:RequiredFieldValidator id="valid1_validator"
ControlToValidate="valid1"
Display="Static"
runat="server">
* Must not be empty
</asp:RequiredFieldValidator>
http://iam.colum.edu/dd/classsource/class4/validation/validator_require.aspx http://iam.colum.edu/dd/gbrowser.php?file=/classsource/class4/validation/validator_require.aspx
Range validator
This example shows the validate method and how to show or not show the error message manually
http://iam.colum.edu/dd/classsource/class4/validation/validator_range.aspx http://iam.colum.edu/dd/gbrowser.php?file=/classsource/class4/validation/validator_range.aspx
<asp:rangevalidator runat="Server"
id="age_range"
controltovalidate="age"
display="dynamic"
errormessage="Age must be an integer between 18 and 65."
minimumvalue="18" maximumvalue="65"
Type="Integer"
EnableClientScript="False">
*
</asp:rangevalidator>
manually check the Page.IsValid state
void Page_Load()
{
//This example shows the validate method and how to show or not show the error message manually
if(Page.IsPostBack){
//You can manully call Validate() whenevr you like
Page.Validate();
//Now we need to check id the results
if(!Page.IsValid)
{
//Check each control and update the error message apropriately
if(!age_required.IsValid){
errorMessage.Text = age_required.ErrorMessage + "<br>";
}
else if(!age_range.IsValid){
errorMessage.Text = age_range.ErrorMessage + "<br>";
}
}
else
{
errorMessage.Text = "no errors";
}
}
}
Progamatically add and Bind Data
You can dynamically add list items to and control that inherits ListControl ListControl
- To add items to a ListControl use the ListControls Items.Add() function
This example assumes the there is a DropDownList called ddlStates
<asp:DropDownList id="ddlStates" runat="server" >
</asp:DropDownList>
//beware code fragment below
ListItem li = new ListItem("SomeState", "SS"); //create a listitem
ddlStates.Items.Add(li); //add the listitem to the dropdown
li = new ListItem("AnotherState", "AS"); //make another listitem
ddlStates.Items.Add(li); //add the second listitem
http://iam.colum.edu/dd/classsource/class3/DataBindDropDownStates.aspx source
Same this but with RadioButtonList
Data Binding
In class
How to add an array to a table or drop down? http://iam.colum.edu/datadesign/classsource/binding/CheeseArray.aspx source CheeseArray.aspx.cs
http://support.microsoft.com/kb/307860
Controls that inherit from ListControls or DataListControl can be databound
DataControls
There are essentially two types of controls that support databinding ListControls and DataBoundControls Presentation Rendering types for data controls
- ListControl
Repeat a fixed template DropDownList,CheckBoxList,RadioButtonList,BulledList
- DataBoundControl Iterative Control
More flexable user defined templates
- DataGrid - very rich table bound controls
- DataList - column or HTML flow bound control
- Repeater - lookless data control (no predetermined formating)
- GridView - very rich table bound controls with Paging Sorting Selecting Editing v 2.0+
- DetailsView - single record editor Paging Sorting Selecting Editing v 2.0+
- FormView - single view for form 2.0+
Demo http://iam.colum.edu/datadesign/classsource/binding/WebControls.aspx source http://iam.colum.edu/datadesign/gbrowser.php?file=/classsource/binding/WebControls.aspx.cs
/WebControls.aspx.cs
Data Controls and Templates
There are essentially two types of controls that support databinding ListControls and DataBoundControls
Presentation Rendering types for data controls
ListControl
- we looked at list contorls in class 2
Repeat a fixed template
- DropDownList
- CheckBoxList
- RadioButtonList
- BulledList
DataBoundControl Iterative Control
- More flexable user defined templates
- DataGrid
- very rich table bound controls
- DataList
- column or HTML flow bound control
- Repeater
- lookless data control (no predetermined formating)
- GridView
- very rich table bound controls with Paging Sorting Selecting Editing v 2.0+
- DetailsView
- single record editor Paging Sorting Selecting Editing v 2.0+
- single view for form 2.0+
- Lookless controls that implements all new 2.0+ templates
http://iam.colum.edu/dd/classsource/ado/SimpleADOAllControls.aspx - source
MVC Models and View Models
In the models folder lets make a new class for the model
public class Course
{
public string CourseName { get; set; }
public string CourseNumber { get; set; }
public bool IsOnline { get; set; }
}
Now add a new controller with the add controller Default way from generated code way
[HttpPost]
public ActionResult Create(FormCollection collection)
{
try
{
// TODO: Add insert logic here
Course course = new Course() { CourseName = collection["CourseName"],
CourseNumber = collection["CourseNumber"],
IsOnline = (bool)collection.GetValue("IsOnline").ConvertTo(typeof(Boolean))};
//return RedirectToAction("Index");
return View("Create", course);
}
catch (Exception e)
{
//throw e;
return View();
}
}
Easier way by strong typing the course
[HttpPost]
public ActionResult Create(Course c)
{
return View("Create", c);
}
Now add the View
MVC Validation
MVC Scaffolding and Validating with the Model
Data Annotation http://www.asp.net/mvc/tutorials/mvc-4/getting-started-with-aspnet-mvc4/adding-validation-to-the-model Or Model State http://msdn.microsoft.com/en-us/library/dd410404(v=vs.90).aspx The class can then be decorated to support validation. You need to include the data annotations fields
using System.ComponentModel.DataAnnotations;
using System.ComponentModel;
The you can add code decorators
[Required]
[DisplayName("Course Name")]
[StringLength(50,
ErrorMessage = "Course Name cannot be longer than 50 characters")]
public string CourseName { get; set; }
[Required]
[DisplayName("CourseNumber")]
[StringLength(12,
ErrorMessage = "First Name cannot be longer than 12 characters")]
public string CourseNumber { get; set; }
[Required]
public bool IsOnline { get; set; }
Home Work
2 pts ASPX Cheese Reg form
2 pts MVC Simple Cheese form
1 pt HTML Cheese Form
Build registration form for cheese conference in html and then build the same form in aspx.
The html page should post a page that displays thank you message. The aspx form should post back to itself, once the form has posted back the survey should be hidden the page should show a summary of the form and a thank you message.
Use the simple course Model above to create an MVC page that validates a course. When the form posts a cheese a view with a summary of the course should be displayed.
