AngularJS UI-Router Nested Views

Akshay Phadke
8y
5.3k
0
1

Article

For more articles on AngularJS, refer to these links.

Introduction

Nested Views have parent child relationship. This means, their properties are available for use for all the child states. There are several methods for creating nested states.

One way to create a nested state is by using dot notation and the other is by using parent property with the parent name as string.

In our Students page, there is a list of students. So, we want the count of how many students are there and the count for the number of males and females. The first step is to create a C# class which will act as container for these.

Name it as studentTotals.cs

Assign the get set properties for total, males, and females.

The next step is to create a web service method in our existing web service, that returns total students. So, we will write the following code.

[WebMethod]
public void GetStudentTotals()
{
// System.Threading.Thread.Sleep(2000);
studentTotals totals = new studentTotals();
// List<Student> listStudents = new List<Student>();
string cs = ConfigurationManager.ConnectionStrings["Test"].ConnectionString;
using (SqlConnection con = new SqlConnection(cs))
{
string query = "SELECT COALESCE(Gender,'GrandTotal') AS Gender,COUNT(*) AS Total from students GROUPBY ROLLUP(Gender)";
SqlCommand cmd = new SqlCommand(query, con);
con.Open();
SqlDataReader sdr = cmd.ExecuteReader();
while (sdr.Read())
{
switch (sdr["Gender"].ToString())
{
case "Male":
totals.males = Convert.ToInt32(sdr["Total"]); break;
case "Females":
totals.females = Convert.ToInt32(sdr["Total"]); break;
default:
totals.total = Convert.ToInt32(sdr["Total"]); break;
}
}
}
JavaScriptSerializer js = new JavaScriptSerializer();
Context.Response.Write(js.Serialize(totals));
}

The name of our method is GetStudentTotals and we are creating the instance of the class which we had created before as studentTotals.cs with three properties - totals, males and females respectively.

And then, we are reading the connection string as Test. From our web.config file, we are using SQL connection object using the query -

SqlConnection con = new SqlConnection

Now, we are building our SQL command object. For that, we have written a SQL query. Let's check the query in SQL and see the output.

query

We have got two columns - gender and total. Within gender column, we have male and grand total, and within the total column, we have respective count.

So, we are building our SQL command by using sqlcommand object.

SqlCommand cmd = new SqlCommand(query, con);

Then, we are opening the connection and executing the command.

con.Open();
SqlDataReader sdr = cmd.ExecuteReader();

And then, we are looping through the rows that are returned. Notice that in our SQL query, we didn’t get any value for female but in code, I have already written a condition for male. So, we will comment that condition for female.

Now, let’s check our web service.

Click on students total and,

Click on Invoke and we will see JSON output displaying total,

students total

The next step is to create student Parent state which will be the parent for students and students details state.

So in our script.js file we modify our controller as,

.state("studentParent", {
url: "/students/",
controller: "studentParentController",
controllerAs: "stdParentCtrl",
templateUrl: "Templates/stduentParent.html",
resolve: {
studentTotals: function($http) {
return $http.get("StudentService.asmx/GetStudentTotals")
.then(function(response) {
return response.data;
})
}
},
abstract: true
})

In this we had a student Parent and the URL respective to the controller name as student Parent Controller and we are using controller as syntax here and we are using resolve property here to retrieve the web method which we had done in our web service.

We had included abstract: true we are making this state as an abstract so what’s an abstract state?

An abstract state is similar to abstract class in C#. Can we create an instance of abstract class? We can’t. Similarly, the abstract state cannot be activated by itself it is implicitly activated when a child statement is activated.

The benefit of using abstract state is that the URL of the parent state is prepended to the URL of the child state. That means we can remove any redundant part from the child state to the URLs. we will see in controller how to remove that.

Another benefit of the parent state is that whatever data we have exposed with the help of resolve property, that data will be available for all the child states.

The next step is to make student details and students to be the child states.

We will use dot to represent parent and child states as-

state("student Parent.students", {

.state("student Parent.student Details", {

Rest of the code is same.

Now if you look at the URL of parent and child state both are the same. So in the child state there is no point in having redundant part so remove URL of child state and replace by “/” as,

Now the next step is we need to create student parent controller function.

redundant part

So we had created studentparent controller in that we had passed studenttotals as parameter as we are using resolve property in the controller.

The next step is to create a student parent template and bind it with binding expression.

Add a HTML page and name it as stduentParent.html now in that write this code

We are using controller as syntax we had bound the respective properties with binding expression.

We are also going to include ui-view directive just below that so that our partial template studentparent.html will get loaded in ui-view directive.

<h1>Total Male Students: {{stdParentCtrl.males}}</h1>
<h1>Total Female Students : {{stdParentCtrl.females}}</h1>
<h1>Total : {{stdParentCtrl.total}}</h1>
<ui-view></ui-view>

Now in our index.html we have to modify students link:

We had included the parent state here. Now similarly modify other links for students.html and studentdetails.html as

Students.html

modify students

Studentdetails.html

Now save the changes and build the app,

At the moment you are in root page,

Click on students,

As you can see we got the count total number of males and females and total number of students from our web service.

When you click on any student you will see,

The same output displaying the count.

The parent state resolved dependencies are available to child states. To prove this, we want to display total number of students on the student’s page against list of student’s text.

We will inject studentTotals in the studentscontroller function as,

So our script.js code is,

/// <reference path="angular.min.js" />
/// <reference path="angular-route.min.js" />
var app = angular.module("Demo", ["ui.router"])
.config(function($stateProvider, $urlMatcherFactoryProvider, $urlRouterProvider, $locationProvider) {
// $routeProvider.caseInsensitiveMatch = true;
$urlRouterProvider.otherwise("/home");
$urlMatcherFactoryProvider.caseInsensitive(true);
$stateProvider
.state("home", {
url: "/home",
templateUrl: "Templates/home.html",
controller: "homeController as homeCtrl",
data: {
customData1: "Home State Custom Data 1",
customData2: "Home Statae custom Data 2"
}
})
.state("courses", {
url: "/courses",
templateUrl: "Templates/courses.html",
controller: "coursesController as coursesCtrl",
data: {
customData1: "Courses State Custom Data 1",
customData2: "Courses Statae custom Data 2"
}
})
.state("studentParent", {
url: "/students/",
controller: "studentParentController",
controllerAs: "stdParentCtrl",
templateUrl: "Templates/stduentParent.html",
resolve: {
studentTotals: function($http) {
return $http.get("StudentService.asmx/GetStudentTotals")
.then(function(response) {
return response.data;
})
}
},
abstract: true
})
.state("studentParent.students", {
url: "/",
templateUrl: "Templates/students.html",
controller: "studentsController as studentsCtrl",
resolve: {
studentsList: function($http) {
return $http.get("StudentService.asmx/GetAllStudents")
.then(function(response) {
return response.data;
})
}
}
})
.state("studentParent.studentDetails", {
url: "/:id",
templateUrl: "Templates/studentDetail.html",
controller: "studentdetailcontroller as StudentDetailCtrl"
})
// .when("/studentssearch/:name?", {
// templateurl: "templates/studentssearch.html",
// controller: "studentssearchcontroller as studentssearchctrl"
// })
// .otherwise({
// redirectto: "/home"
// })
$locationProvider.html5Mode(true);
})
.controller("homeController", function($state) {
this.message = "Home Page";
this.homeCustomData1 = $state.current.data.customData1;
this.homeCustomData2 = $state.current.data.customData2;
this.coursesCustomData1 = $state.get("courses").data.customData1;
this.coursesCustomData2 = $state.get("courses").data.customData2;
})
.controller("coursesController", function() {
this.courses = ["c#", "SQL", "Oracle"];
})
.controller("studentsController", function(studentsList, $state, $location, studentTotals) {
var vm = this;
vm.searchStudents = function() {
if (vm.name) {
$location.url("/studentsSearch/" + vm.name);
} else {
$location.url("/studentsSearch/");
}
}
vm.reloadData = function() {
$state.reload();
}
vm.students = studentsList;
vm.studentTotals = studentTotals;
})
.controller("studentParentController", function(studentTotals) {
this.males = studentTotals.males;
this.females = studentTotals.females;
this.total = studentTotals.total;
})
.controller("studentdetailcontroller", function($http, $stateParams) {
var vm = this;
$http({
url: "StudentService.asmx/GetStudents",
method: "get",
params: {
id: $stateParams.id
}
})
.then(function(response) {
vm.student = response.data;
})
})
//.controller("studentsSearchController", function ($http, $routeParams) {
// var vm = this;
// if ($routeParams.name) {
// $http({
// url: "StudentService.asmx/GetStudentsByName",
// params: { name: $routeParams.name },
// })
//.then(function (response) {
// vm.students = response.data;
//})
// }
// else {
// $http.get("StudentService.asmx/GetAllStudents")
// .then(function (response) {
// vm.students = response.data;
// })
// }