Code Globe: JavaScript

Creating array of HTML form elements

Array is a collection of similar data elements, means we can use array to store similar elements referenced under a common name.

In web development sometimes we need to group HTML form elements as arrays do. For example, you have a form where user has to select his hobbies from a group of check boxes as given below.

Sample Code

<form action="showlist.php" method="post" name="hobby_frm">
<h3> Select your hobbies </h3>
<input type="checkbox" name="hobbies[]" value="hb1"  />
Reading <br />
<input type="checkbox" name="hobbies[]" value="hb2" />
Surfing <br />
<input type="checkbox" name="hobbies[]" value="hb3" />
Listening to music  <br />
<input type="submit" value="submit" />
</form>

Please notice the name of all checkboxes hobbies[]
The above code will define an array with the name hobbies

Accessing form elements array using JavaScript

Now, let's see how to access the hobbies[] using JavaScript.

<script type="text/javascript">
var hobbies = document.hobby_frm.elements['hobbies[]'];
var str = "Length  : "+hobbies.length+"\n";
for( var i = 0; i < hobbies.length; i++ ) {
str = str + "Hobby "+(i+1)+" : "+hobbies[i].value+"\n";
}
alert(str);
</script>

Handle form elements array in PHP

In PHP, data sent from a form with post method is available in $_POST array.
We can access hobbies[] using the following code.

<?php

    $hobbies = $_POST['hobbies']; // use name of the array as key

    foreach( $hobbies as $value )

       print $value;

?>

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Gantt Chart in asp.net

A Gantt chart(wiki link) is a type of bar chart that illustrates a project schedule. Gantt charts illustrate the starting and finishing dates of terminal elements and summary elements of a project. Terminal elements and summary elements comprise the work breakdown structure of the project. Some Gantt charts also show the dependency (i.e, precedence network) relationships between activities.

We here use jsgantt(Its a free JavaScript library for creating Gantt chart) to create Gantt chart having following features .It’s implemented using JavaScript, HTML, CSS and thus very fast and flexible. Since it is pure HTML/JavaScript you can integrate this with any server side scripting language.

URL: http://www.jsgantt.com

Basic Features

* Tasks & Collapsible Task Groups

* Multiple Dependencies

* Task Completion

* Task Color

* Milestones

* Resources

* No images needed

* Free [released under BSD license]

Advanced Features

* Dynamic Loading of Tasks

* Dynamic change of format (day/week/month)

* Load Gantt from XML file

Disadvantage

Currently only one Gantt chart is allowed per page.

You can download jsGantt from http://code.google.com/p/jsgantt/

There are many ways to integrate gantt chart programmatically, here we explain one of the method which using external data exchange between asp.net and JavaScript using XML file that are generated at run time using values from the SQL Server Database.

Sample xml file Structure that used by jsgantt. Is as follows

<task>

<pName>WCF Changes</pName>

</task>

<task>

<pName>Move to WCF from remoting</pName>

</task>

</project>

XML tags in our External XML file have following tags and values. Here we describe the purpose of each tag:

pID: (required) is a unique ID used to identify each row for parent functions and for setting dom id for hiding/showing

pName: (required) is the task Label

pStart: (required) the task start date, can enter empty date ('') for groups

pEnd: (required) the task end date, can enter empty date ('') for groups

pColor: (required) the html color for this task; e.g. '00ff00'

pLink: (optional) any http link navigated to when task bar is clicked.

pMile:(optional) represent a milestone

pRes: (optional) resource name

pComp: (required) completion percent

pGroup: (optional) indicates whether this is a group(parent) - 0=NOT Parent; 1=IS Parent

pParent: (required) identifies a parent pID, this causes this task to be a child of identified task

pOpen: can be initially set to close folder when chart is first drawn

pDepend: optional list of id's this task is dependent on ... line drawn from dependent to this item

pCaption: optional caption that will be added after task bar if Caption Type set to "Caption"

Creating Database Schema in Sql Server

Create database named Projects in SQL Server

Tables

project

Column Name --------------------------------Data Type

projectid-----------------------------------------Int(PK)

projectname-------------------------------------Varchar(50)

startdate-----------------------------------------Datetime

enddate------------------------------------------Datetime

tasks

Column Name---------------------------------- Data Type

taskid-------------------------------------------Int((PK)

projectid----------------------------------------Int(FK)

taskname---------------------------------------Varchar(50)

startdate----------------------------------------Datetime

enddate---------------------------------------- Datetime

percentagecompleted---------------------------Int

parenttask--------------------------------------Int

Sample data

project

projectid----------------------name------------------ startdate-------------- enddate

1---------------------------Search Engine-----------04/03/2009 -----------04/30/2009

Task

projectid name startdate enddate percentagecompleted parenttask

1--------------Analysis----- 4/3/2009----- 4/11/2009-----100 -------------------- 0

2--------------Design-------4/12/2009----4/15/2009------100---------------------1

3--------------Code--------4/16/2009----4/20/2009-------25----------------------2

4--------------Test ---------4/21/2009--- 4/27/2009--------0 ----------------------3

5------------- Test2---------4/28/2009----4/30/2009------- 0 ----------------------4

*Tasks Date is in mm/dd/yyyy format

Using Gantt Chart in your ASP.NET Application

Create a website project in ASP.NET in Visual Studio.

Add an XML file named Tasks.xml to project

UnCompress Copy paste jsgantt directory you downloaded from jsGantt Website http://code.google.com/p/jsgantt/ to your project

Add dropdownlist control to Default.aspx to fill projects and to select name it cmbproject

Edit .aspx page’s HTML do following step

1. Include JSGantt CSS and Javascript

Add this just before the </head> tag

<link rel="stylesheet" type="text/css" href="jsgantt.css" />

<script language="javascript" src="jsgantt.js"></script>

2. Create a div element to hold the Gantt chart

In your html body

<div style="position:relative" class="gantt" id="GanttChartDIV"></div>

Add This script to html body

var g = new JSGantt.GanttChart('g',document.getElementById('GanttChartDIV'), 'day');//Here intantiating chart control

g.setShowRes(1); // Show/Hide Responsible (0/1)

g.setShowDur(0); // Show/Hide Duration (0/1)

g.setShowComp(1); // Show/Hide % Complete(0/1)

//g.setCaptionType('Resource'); // Set to Show Caption (None,Caption,Resource,Duration,Complete)

if( g ) {

// You can also use the XML file parser

JSGantt.parseXML('Tasks.xml',g)//Read data from Tasks.xml

g.Draw();

g.DrawDependencies();

}

else

{

alert("not defined");

}

</script>

ASP.NET CODE

Default.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<title>Untitled Page</title>

</head>

<body>

<div>

<tr>

</td>

</td>

</td>

</tr>

<tr>

</td>

<asp:DropDownList ID="cmbproject" runat="server" AutoPostBack="True" OnSelectedIndexChanged="cmbproject_SelectedIndexChanged"

Width="165px">

</asp:DropDownList></td>

</td>

</tr>

<tr>

</td>

</td>

</td>

</tr>

</table>

</div>

</div>

var g = new JSGantt.GanttChart('g',document.getElementById('GanttChartDIV'), 'day');

g.setShowRes(1); // Show/Hide Responsible (0/1)

g.setShowDur(0); // Show/Hide Duration (0/1)

g.setShowComp(1); // Show/Hide % Complete(0/1)

//g.setCaptionType('Resource'); // Set to Show Caption (None,Caption,Resource,Duration,Complete)

if( g ) {

// You can also use the XML file parser

JSGantt.parseXML('Tasks.xml',g)//Read data from Tasks.xml

g.Draw();

g.DrawDependencies();

}

else

{

alert("not defined");

}

</script>

</form>

</body>

</html>

Default.aspx.cs

using System;

using System.Data;

using System.Configuration;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using System.Data.SqlClient;

using System.Xml;

public partial class _Default : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

{

//Fill dropdownlist with all projects names

SqlConnection mcon = new SqlConnection("Data Source=CYBERMIND\\SQLEXPRESS;Database=Projects;Trusted_Connection=True"); //Cahnge Connection string of your SQL Server Here

mcon.Open();

cmbproject.Items.Clear();

SqlCommand GetProjectName = new SqlCommand("select projectid,name from project", mcon);

SqlDataReader ReadPrjName;

ReadPrjName = GetProjectName.ExecuteReader();

cmbproject.Items.Add("--------Select-----");

while (ReadPrjName.Read())

{

ListItem LIT = new ListItem();

LIT.Text = ReadPrjName.GetValue(1).ToString();//Add Project name as dropdownlists Text

LIT.Value = ReadPrjName.GetValue(0).ToString();//Add Projectid as dropdownlists Value

cmbproject.Items.Add(LIT);

}

ReadPrjName.Close();

mcon.Close();

}

protected void cmbproject_SelectedIndexChanged(object sender, EventArgs e)

{

string projectid = "";

SqlConnection mcon = new SqlConnection("Data Source=CYBERMIND\\SQLEXPRESS;Database=Projects;Trusted_Connection=True");

mcon.Open();

//Creating data of ou Task.xml programatically

XmlTextWriter xwriter = new XmlTextWriter(Server.MapPath("Tasks.xml"), null); //Creating a Xml Text writer

xwriter.Formatting = Formatting.Indented;// Setting indendation in xml file

xwriter.Indentation = 4;// Indentation space is 4 here

SqlCommand mmcmd = new SqlCommand("select projectid,name,convert(varchar(10),startdate,101),convert(varchar(10),enddate,101) from project where projectid =" + cmbproject.SelectedItem.Value + "", mcon);

SqlDataReader projectReader = mmcmd.ExecuteReader();

xwriter.WriteStartElement("project");

while (projectReader.Read())

{

projectid = projectReader.GetValue(0).ToString();

xwriter.WriteStartElement("task");

xwriter.WriteStartElement("pID"); // WriteStartElement writes a tag

xwriter.WriteString(projectReader.GetValue(0).ToString()); // WriteString writes strin to xml file

xwriter.WriteEndElement();// WriteStartElement writes a end tag

xwriter.WriteStartElement("pName");

xwriter.WriteString(projectReader.GetValue(1).ToString());

xwriter.WriteEndElement();

xwriter.WriteStartElement("pStart");

xwriter.WriteString(projectReader.GetValue(2).ToString());

xwriter.WriteEndElement();

xwriter.WriteStartElement("pEnd");

xwriter.WriteString(projectReader.GetValue(3).ToString());

xwriter.WriteEndElement();

xwriter.WriteStartElement("pParent");

xwriter.WriteString("0");

xwriter.WriteEndElement();

}

//End of Project Details Read and Write to XML

mcon.Close();

SqlConnection mcon2 = new SqlConnection("Data Source=CYBERMIND\\SQLEXPRESS;Database=Projects;Trusted_Connection=True");

mcon2.Open();

string str = "select taskid,taskname,convert(varchar(10),startdate,101),convert(varchar(10),enddate,101), percentagecompleted from Task where projectid =" + cmbproject.SelectedItem.Value + " ";

SqlCommand mcmd = new SqlCommand(str, mcon2);

SqlDataReader reader = mcmd.ExecuteReader();

//Start to read and write Tasks to Xml file

while (reader.Read())

{

xwriter.WriteStartElement("task");

xwriter.WriteStartElement("pID");

xwriter.WriteString(reader.GetValue(0).ToString());

xwriter.WriteEndElement();

xwriter.WriteStartElement("pName");

xwriter.WriteString(reader.GetValue(1).ToString());

xwriter.WriteEndElement();

xwriter.WriteStartElement("pStart");

xwriter.WriteString(reader.GetValue(2).ToString());

xwriter.WriteEndElement();

xwriter.WriteStartElement("pEnd");

xwriter.WriteString(reader.GetValue(3).ToString());

xwriter.WriteEndElement();

xwriter.WriteStartElement("pColor");// Sets chart task bar color to blue

xwriter.WriteString("ff00ff");

xwriter.WriteEndElement();

xwriter.WriteStartElement("pComp");

xwriter.WriteString(reader.GetValue(4).ToString());

xwriter.WriteEndElement();

xwriter.WriteStartElement("pParent");

xwriter.WriteString(projectid);

xwriter.WriteEndElement();

}

xwriter.WriteEndElement();

//Start to read and write Tasks to Xml file

xwriter.Flush();

xwriter.Close(); //Close XML File

mcon2.Close();

}

Download Complete Project Code

Code Globe

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Download Aptana Studio 1.2.6
Inlcudes Aptana Cloud & Jaxer. Add support for PHP, Ruby, Rails, Python, iPhone and Adobe AIR after installation.

Ext JS 2.0

Wednesday, April 15, 2009

Creating Gantt Chart in ASP.NET

php object array to javascript array

LinkWithin

Contributors

Sunday, April 15, 2012

Extending a Javascript function without affecting the original function defenition.

Thursday, October 15, 2009

HTML Form elements array

Monday, April 20, 2009

Aptna Studio

Download Aptana Studio 1.2.6 Inlcudes Aptana Cloud & Jaxer. Add support for PHP, Ruby, Rails, Python, iPhone and Adobe AIR after installation.

Ext JS 2.0

Wednesday, April 15, 2009

Creating Gantt Chart in ASP.NET

php object array to javascript array

LinkWithin

Download Aptana Studio 1.2.6
Inlcudes Aptana Cloud & Jaxer. Add support for PHP, Ruby, Rails, Python, iPhone and Adobe AIR after installation.