Saturday, May 30, 2015

Logout user after browser close in ASP.NET C# using web services

Introduction:
Keeping a track of user's time in your web application is one of the most important issue to maintain. It not only helps to keep the track of user's but also it helps to solve any other analytical problems with application's data, like average in time, average out time, average time spent in your application etc. So how to keep the users login logout information of your web application.

By clicking on the login button you can easily get the login time, and I hope you have kept your session checking active during logging of your users. On other hand by clicking on the Logout button you can also trace the logout time. But what happen when user close the browser, then how will you keep the track of user's logout time. Here in this post we will discuss about this serious issue.

Using of Web Services
Instead of using  normal methods we will use Web services to get the logout time for the user.

What is Web Services?
According to MSDN
Web services are components on a Web server that a client application can call by making HTTP requests across the Web. ASP.NET enables you to create custom Web services or to use built-in application services, and to call these services from any client application.
Key Concept:
There is a function named onbeforeunload of javascript. This is called at the time of unloading the web page, whether you are closing the browser or closing the tab or redirecting to any other web page from that particular page, where it is coded. Do not use an alert() within onbeforeunload, it will not work.

Using this we are getting the login session id and passes it to the web services. And in web service we are doing our necessary thing(sql server entry or putting it in any notepad with login id etc.).

Using the code:
 Lets create a project named it whatever you want. Add a new web form and design it according to you.

On the aspx page's head section write down the following code.

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
<script>
        window.onbeforeunload = function (evt) {
            var message = 'You have started writing or editing a post.';
            var loginId = '<%= Session["LoginId"].ToString() %>';
            console.log('in');

            $.ajax({
                url: "Logout.asmx/LogoutMethod",
                contentType: "application/json; charset=utf-8",
                type: "POST",
                success: function (data) {
                    alert(data);
                },
                error: function (x, y, z) {
                    alert(x.responseText + "  " + x.status);
                }
            });
        }
</script>

On body you do whatever your design or work. In the web services write down again the following code. And make sure that [System.Web.Script.Services.ScriptService] is uncommented


[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.ComponentModel.ToolboxItem(false)]
// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line.
[System.Web.Script.Services.ScriptService]
public class Logout : System.Web.Services.WebService
{
   [WebMethod (EnableSession = true)]
   public string LogoutMethod()
   {
       // take a log.txt and write on there with time
       string a = Session["LoginId"].ToString();
       File.AppendAllText(Server.MapPath("~/log.txt"),"Login id loges out "+a+ " at "+ DateTime.Now.ToString()+ Environment.NewLine);

        return "";
    }
}

Before run this create a log.txt file in your solution explorer, where all your log out log will be stored.

You can down the full source code here.  Now its your turn to do. Try it in your machine.

Saturday, May 23, 2015

Team management Part-I (View users)

Team Management
  1. Team Management part 1 (View users) [Current]
  2. Team Management Part II (Add Users) 

In various applications user is the main character to play a role and for software developer, user management is a big issue to handle. Many thing like user satisfaction, user info secrecy, child parent management, easy to handle, scalability etc. are one of the parts of user management process.  Today in this post I choose to write about the parent child relation within a user management or rather we should say the Team management. This is only the part 1, registration checking delete and many others are coming after this.

What is a Team?

So what is a Team? A group of users which has an admin or manager who is managing a set of people or users. And with all those users a team is forming. In the terms of database all the users are virtual, there is no existing of a physical user. So how to manage those virtual users from our database. Lets see.

Basic Database design:

Database design is one of the most important part of a team management process. If your table structure is not properly maintained then many more problems will arise as the no. of team members will increase. As it follows a tree structure you can take a single table or more than one table to put your users with their all details and an important one, their level.  Level is the one thing from which you can actually track your users and do a descend tracking of users.

Database Design:

UserId (Primary Key)
Int (Identity(1,1))
Email
NVarChar(255)
Name
NVarChar(255)
Password
NVarChar(255)
ParentId
Int
IsDelete
Bit

Here I didn't take any position to place the member under an admin. All the users are under one roof. And they are distinguished by UserId & Email and described as a child of a Parent with ParentId.

Design of the database is quite simple and straight forward. I hope you will understand it clearly.


Query to fetch:

Now we have to write the SQL query to fetch the data along with the parent details. The most easiest and simplest way is to use Self Join. To know Self join more precicely you can follow either w3resource.com or w3schools.com. Both have explained it very well.  Now lets come to our query.

select a.UserId, a.Name, a.Email, b.UserId, b.Name, b.Email from tblUser a inner join tblUser b
on a.ParentId = b.UserID

This query will return the all users with their and their parents details.

select a.UserId, a.Name, a.Email, b.UserId, b.Name, b.Email from tblUser a inner join tblUser b
on a.ParentId = b.UserID and a.UserId = '<user_id>'

With the help of this query you can get a single user's details with his/her parents details.

Now you have to find out the possible children and possible parents of a selected node.  For this follow the bellow SQL query.

Query to find all possible parents


DECLARE @UserId INT;
SET @UserId = 4;
WITH tblParent AS
(
    SELECT *
        FROM tblUser WHERE UserId = @UserId
    UNION ALL
    SELECT tblUser.*
        FROM tblUser  JOIN tblParent  ON tblUser.UserId = tblParent.ParentId
)
SELECT * FROM  tblParent
    WHERE UserId <> @UserId
OPTION(MAXRECURSION 32767)

Query to find all possible children


DECLARE @userId INT;
SET @userId = 1;
WITH tblChild AS
(
    SELECT *
        FROM tblUser WHERE ParentId = @userId
    UNION ALL
    SELECT tblUser.* FROM tblUser  JOIN tblChild  ON tblUser.ParentId = tblChild.UserId
)
SELECT *
    FROM tblChild
OPTION(MAXRECURSION 32767)



View Team:

You have done your database, you have shown the details of user and their parents information in a tabular format. Now its time for some graphics. We will produce a genealogy or family view of the whole team, or you can set the admin from a particular user (can be set by sql query).

There are whole lots of process to generate a genealogy view. Here I choose two of the easiest way to generate.
  1. Using Google Organizational Chart
  2. Using ulli and CSS3
Google Organizational Chart:

You can get the full details of Google Organizational chart from here. But here I will show you how to connect this with your SQL database. For this you don't need to do much more thing. You just have to create the string which will contain the user data along with their parents' id or name.
Just have a look over the line

data.addRows([['Mike',''], ['Jim''Mike'], ['Alice''Mike'],['Bob','Jim'],['Carol''Jim']]);

It contains the whole of the operation, it is holding the data. You have to create this data string to generate your parent child view. I am taking a DataTable to store the data. You will use the upper sql query to do so.


string s = "";
DataTable table = new DataTable();
table.Columns.Add("name"typeof(string));
table.Columns.Add("parent"typeof(string));
table.Rows.Add("Mike""");
table.Rows.Add("Jim""Mike");
table.Rows.Add("Alice""Mike");
table.Rows.Add("Carol""Jim");
for (int i = 0; i < table.Rows.Count; i++)
{
     s = s + "['"+table.Rows[i][0].ToString()+"','"+table.Rows[i][1].ToString()+"'],";
}
s = s.TrimEnd(',');



Now in the s string you have all the data stored. Only passing the data stream to JS is left. To do follow the next step.



String csname1 = "PopupScript";
Type cstype = this.GetType();
ClientScriptManager cs = Page.ClientScript;
if (!cs.IsStartupScriptRegistered(cstype, csname1))
{
     StringBuilder cstext1 = new StringBuilder();
     cstext1.Append("<script>");
     cstext1.Append("google.setOnLoadCallback(drawChart);");
     cstext1.Append("function drawChart() {");
     cstext1.Append("var data = new google.visualization.DataTable();");
     cstext1.Append("data.addColumn('string', 'Name'); data.addColumn('string', 'Manager');");
     cstext1.Append("data.addRows(["+s+"]);");
     cstext1.Append("var chart = new google.visualization.OrgChart(document.getElementById('chart_div'));");
     cstext1.Append("chart.draw(data, { allowHtml: true });");
     cstext1.Append("}");
     cstext1.Append("</script>");
     cs.RegisterStartupScript(cstype, csname1, cstext1.ToString());
 }




Here I am using ClientScriptManager to run the created JS code from back end(C# code). Run the code and see the result. 


Using ulli and CSS3:

We have seen how to do this with he help of Google Organizational Chart. Now its time for a pure HTML, CSS work to do. For that We need to generate the HTML. Follow the bellow code to generate the HTML quickly.


DataView view = new DataView(table);
DataTable distinctValues = view.ToTable(true, "parentid");
tree += "<div class='tree'><ul><li style='background-color: white;'>Relegare(Admin)[rel]</li></ul></div>";

 for (int i = 1; i < distinctValues.Rows.Count;i++ )
 {
     SqlDataAdapter da2 = new SqlDataAdapter("select userid,fname+' '+lname from tbl_userlogin where parentid='" + distinctValues.Rows[i]["parentid"] + "'",con);
     DataTable dt2 = new DataTable();
     da2.Fill(dt2);
     string temp = "";
     for(int j =0;j<dt2.Rows.Count;j++)
     {
         if (j == 0)
         {
              temp += "<ul>";
         }
         temp += "<li>" + dt2.Rows[j][1].ToString() + " [" + dt2.Rows[j][0].ToString() + "]</li>";
         if (j == dt2.Rows.Count-1)
         {
              temp += "</ul>";
              if (i == 1)
              {
                   tree = tree.Replace("[rel]", temp);
              }
              else
              {
                   tree = tree.Replace("["+distinctValues.Rows[i][0].ToString() + "]", temp);
              }
         }
     }
}
tree = tree.Replace("[]","");
tree = Regex.Replace(tree, @"\[(.*?)\]", "");

For CSS follow the jsfiddle online demo.



Run your own project to check the team management, though I didn't mention the add or edit/delete part of the team management. In next article I will discuss about the manage roles and permissions of users from their admin end. Enjoy coding.

Download the Download the full source code of Google Organizational chart here.

Thursday, May 21, 2015

Find all the input in a particular cell of a HTML table

Here in this post I will show you how to fetch all the input data of a particular cell of a HTML table using JQuery. What ever the input we are taking in HTML (text, radio, password, checkbox etc.)

Follow the following JSFiddle to get the value of all input tag value in a particular cell.

How it s happening ?
For each tr and every td of that tr, we are searching for the input tag. And where we are getting an input tag we are taking the value of that element. We have taken value as we are moving on text boxes only. If your code is based on checkbox, radio button or  any thing else, then you have to code according to that.



I have taken here tr:eq(1) td:eq(1) for the only 2nd cell of 2nd tr (searching starts with 0). If you want to search through over all table then use  tr td only.

Customize your code and enjoy...

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