JavaScript - Referring To An Already Defined Property In Object Literals

I am and seem to remain newbie ...

I have a JS script that presents a series of "pages" with different questions inside a single HTML file, by rewriting certain <div>s.

I have an object like this that contains the questions and information about answer labels etc (the idea is that this should be easy to modify for someone who doesn't know JS):

Code:

var Questions = [
    {
        "question" : "How good is this?",
        "labels" : ["excellent","very good","good","bad","very bad","awful"],
        "page" : 0 ,
        "random" : false ,
        "type" : "default",
        "varname" : "allgood"
    },
    {
        "question" : Change[curCase]+"What do you think now?",
        "labels" : BetterLabels,                                                               
        "page" : 1 ,
        "random" : true ,
        "type" : "default",
        "varname" : "betteradapt"
    }
]

This object is initialized when the page loads, and a function reads the total number of pages by getting the maximum number of the "page" property across elements.

Later, the object is accessed by thenextQuestion() function which uses the "page" property to looks whether each element belongs on the current page , then reads out the properties and presents the question.

This works okay. Now the tricky bit:

For some questions, their text should be different depending on which case is currently on the screen (Change[curCase]). curCase is different on each page, an integer between 0 and Change.length. I cannot get this to work for the Questions object, probably because the Questions object has been already initialized when the page loaded.

How can I get my function nextQuestion() to "re-evaluate" the property "question" for all the elements of the Questions objectwhen nextQuestion() is called , using the current value of "curCase"?

nextQuestion() is longer, but the (i think!) crucial bits are he

Look whether question belongs on current page and push it onto new array:

Code:

for (i=0; i < Questions.length; i++) {
        Questions[i].page = Questions[i].page;
        if ( Questions[i].page == BlockNum ) { // if the q belongs on the current page               
            QuestionsObjectThisPage.push(Questions[i]);
        }
    }

Then, extract an array containing the questions, which will then be presented:

Code:

 for (i=0; i < QuestionsObjectThisPage.length; i++) {
QuestionsThisPage.push(QuestionsObjectThisPage[i].question) ;
}

So what I'm looking for is something to change either of these two Object.push() functions so they don't simply take the value they find in the Questions (or QuestionsThisPage) object, but to re-evaluate the code for the "questions" property, taking into account the current value of curCase

Phew. I found that really hard to describe; hope it's somewhat clear.

Hello,

how can I make the following object work properly so when I use 'layers.photo1.layer' a jQuery element is returned rather than the text of the function as it is now.

I also need to be able to find the element by the photo1 object its contained in not have to input a string there so that I can also reuse it in the background layer.

Code:

		var layers = {			
			photo1 : {
				layer: function() { return $(element).find($('photo1'))}
			},
			background : {
				layer: function() { return $(element).find($('background'))}
			}
		}

Thx Very Much!

Hello just a quick problem with a seemingly difficult solution that I'm not aware throughout.

What I'm attempting to do is increment a value when the mouse hovers over the element by using this move_right function:
Code:

function Move_Right( event, element, number) {
    number++;
    var elem = document.getElementById(element);
    elem.style.right =  number + "px";
  }

inside the mouseover event trigger function which I figured out.

The problem is it doesn't move incrementally only once every mouse hover no matter the technique of setInterval(); and or setTimeout(); also ontop of this problem I'm getting errors like :

2014-10-12 20:07:57.785Uncaught TypeError: Cannot read property 'style' of null even after the changes I made also after this original function call :

This is the current code so far which is different to the previous code above "obviously" :
Edit fiddle - JSFiddle

Thanks if someone knows the issues here, I hope it makes sense .

My website is working perfectly on Firefox but when I visit it with IE(7), I get the following errors and some things aren't where they're supposed to be.

Quote:
Webpage Script Errors

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; SLCC1; .NET CLR 2.0.50727; InfoPath.2; .NET CLR 3.5.30729; .NET CLR 3.0.30618)
Timestamp: Fri, 25 Sep 2009 08:31:56 UTC

Message: Object doesn't support this property or method
Line: 8
Char: 186
Code: 0
URI: http://icarwakim.com/media/system/js/mootools.js

Message: Object doesn't support this property or method
Line: 59
Char: 102
Code: 0
URI: http://icarwakim.com/media/system/js/mootools.js
Website: http://www.icarwakim.com

Any advise?

I'm Sunita.
I am working in ASP .net . I have created Class1.dll file .
and in javascript I am creating ActiveXobject . when i debug the application . Its gives error like Object doesn't support this property or method.

my code is

Code:

Class1.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.IO.Ports;

namespace Ana7140
{
    public class Class1
    {
        //Declare Variables
        string data = "";
        string log = "";
        bool DoneDataReceived = false;
        bool tare = false;
        private SerialPort comport = new SerialPort();


        public void send()
        {

            //Send comport 
            comport.Write("?1");


            if (data.Length > 1)
            {
                data = data.Replace('\r', ' ');
                char sign = data[1];
                string DelimeterStr = "+-";
                char[] delimiter = DelimeterStr.ToCharArray();
                string[] splited = null;
                splited = data.Split(delimiter);
                data = Convert.ToString(sign) + Convert.ToString(Convert.ToDouble(splited[1]));
            }
            else
            {
                data = "";
            }
        }

        public string GetValue()
        {
            //Send command to  port 
            if (comport.IsOpen)
            {
                if (tare == true)
                {
                    comport.Write("?1");
                    log = log + "Sent ?1 command";

                    //if (data.Length > 1)
                    //{
                    //    data = data.Replace('\r', ' ');
                    //    char sign = data[1];
                    //    string DelimeterStr = "+-";
                    //    char[] delimiter = DelimeterStr.ToCharArray();
                    //    string[] splited = null;
                    //    splited = data.Split(delimiter);
                    //    data = Convert.ToString(sign) + Convert.ToString(Convert.ToDouble(splited[1]));
                    //}
                    //else
                    //{
                    //    data = "";
                    //}
                    while (true)
                    {
                        if (DoneDataReceived == true)
                        {
                            DoneDataReceived = false;
                            break;
                        }
                    }
                    tare = false;
                }//end of if(tare==true)
                else
                {
                    data = "-2";
                }
            }
            else
            {
                data = "-1";
            }
            //This will return the data only   
            return data;
        }

        //To fetch the data from Serial Port
        public void port_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            try
            {

                if (comport.IsOpen)
                {

                    //Reading Data from Serial Port

                    data = comport.ReadLine();//.ReadExisting();

                    log += data;
                    //   GetValue();
                    if (data.Length > 1)
                    {
                        data = data.Replace('\r', ' ');
                        char sign = data[1];
                        string DelimeterStr = "+-";
                        char[] delimiter = DelimeterStr.ToCharArray();
                        string[] splited = null;
                        splited = data.Split(delimiter);
                        data = Convert.ToString(sign) + Convert.ToString(Convert.ToDouble(splited[1]));
                    }
                    else
                    {
                        data = "";
                    }
                    DoneDataReceived = true; //Done with data processing

                }

            }
            catch (Exception ex)
            {
                //MessageBox.Show(ex.Message);
            }
        }
        public string getLog()
        {
            return log;
        }
        //This Function initialiases the serial port
        //public void Initialise()
        //{
        //    try
        //    {
        //        isInitialise = true;
        //        correct = false;
        //        init = true;
        //        //sending command to serial port for initialization
        //        //comport.Write("*\n");
        //    }
        //    catch (Exception ex)
        //    { }
        //}
        public void Tare()
        {
            try
            {
                //sending command to serial port for initialization
                comport.Write("T\n");
                tare = true;
            }
            catch (Exception ex)
            { }
        }

        //This function opens the comport
        public void Start()
        {
            try
            {
                //if previously comport is open the firstly close this connection then open again comport
                if (comport.IsOpen)
                {
                    comport.Close();
                }
                else
                {
                    //set Baudrate value as 300
                    comport.BaudRate = 300;
                    //to read data in string set Data bits as 8
                    comport.DataBits = 8;
                    //set stop bits as 1
                    comport.StopBits = (StopBits)1;
                    //set parity bit as None
                    comport.Parity = (Parity)Enum.Parse(typeof(Parity), "None");
                    //Set Port Name as COM1
                    //comport.PortName = "COM1";
                    //Set Read Time Out as 100
                    comport.ReadTimeout = 100;
                    //Open comport
                    comport.Open();
                    //Call event for serial data received
                    comport.DataReceived += new SerialDataReceivedEventHandler(port_DataReceived);
                    //data = "";
                    // comport.Write("?1");
                }
            }
            catch (Exception ex)
            {

            }
        }
        //close the connection and close the comport
        public void Stop()
        {
            try
            {
                //check whether comport is open or not 
                //if comport is open then close the comport
                if (comport.IsOpen)
                {
                    //comport.ReadExisting();
                    comport.Close();
                }
            }
            catch (Exception ex)
            { }
        }//End of Stop

        //To check Connection is Opened or not
        public string getStart()
        {
            string check = "";
            try
            {
                if (comport.IsOpen)
                {
                    check = "0"; //If the connection is opened,then check=0

                }
                else
                {
                    check = "-1"; //If the connection is closed,then check=-1
                }

            }//End of try
            catch (Exception ex)
            { }
            return check;
        }//End of getStart

       
    }
}


JavaScript program is

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

<html xmlns="http://www.w3.org/1999/xhtml" >
<head><title>
	Untitled Page
</title>
    <script language="javascript">
	
	var wshell;
    wshell=new ActiveXObject("Ana7140.Class1");
	
    function GetVal()
    {
    
   var val= wshell.GetValue();
    
   alert(val);
  
}
function setip()
    {
    
   wshell.Start();
    wshell.Initialise();
    
   
   alert(val);
  
}
function Stop()
    {
     wshell.Stop();
    //alert(val);
  // wshell.Stop();
     //alert(val);
}

function Tares()
    {
     wshell.Tares();
    //alert(val);
  // wshell.Stop();
     //alert(val);
}



</script>
</head>
<body>
    <form name="form1" method="post"  id="form2">


    <div>
    <a href="#" onclick="javascript:setip()"> Connect </a>
        &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
    <a href="#" onclick="javascript:GetVal()"> Acquire Weight </a>
	&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
       <a href="#" onclick="javascript:Stop()"> Disconnect </a>
     &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;         
     <a href="#" onclick="javascript:Tares()"> Tares </a>
    </div>
    </form>
</body>
</html>

plz help me