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Thread: Building a Table in JavaScript

  1. #1
    Join Date
    Oct 2013
    Location
    Los Angeles, CA.
    Posts
    5

    Building a Table in JavaScript

    I am trying to create a table in JavaScript that contains a list of degrees, radians, sin, cos, and tan.

    I have the math right, but I am having trouble with the creating the table.

    It is not displaying. I know it is something simple, but I am missing it.

    Ideas?

    Code:
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
    <html><head><title>Computer Science 553 Lab Pages: Lab 3: Trig Functions On The Fly</title>
    <link rel="stylesheet" type="text/css" href="style.css" />
    </head>
    <body>
    <h1>Table of Sines, Cosines, and Tangents</h1>
    <h2>Charles P. Scott    |    9092</h2>
    <hr>
    
    <script type="taxt/javaScript">
    // Setting Up Variables
    var myTable			=	document.createElement("table");
    var tRowH			=	document.createElement('tr');
    var tCellH_Radians	=	document.createElement('th');
    var tCellH_Degrees	=	document.createElement('th');
    var tCellH_SinX		=	document.createElement('th');
    var tCellH_CosX		=	document.createElement('th');
    var tCellH_TanX		=	document.createElement('th');
    var angleR			=	0;
    var angleD			=	0;
    
    // Building the Table
    document.appendChild(myTable); // <table>
    
    // Creating the Header Row 
    myTable.appendChild(tRowH); // <th>
    
    // Building the Cells in the Header Row
    tRowH.appendChild(tCellH_Radians);
    tRowH.appendChild(tCellH_Degrees);
    tRowH.appendChild(tCellH_SinX);
    tRowH.appendChild(tCellH_CosX);
    tRowH.appendChild(tCellH_TanX);
    
    // Populate the Cells in the Header Row
    tCellH_Radians.appendChild(document.createTextNode('Radians'));
    tCellH_Degrees.appendChild(document.createTextNode('Degrees'));
    tCellH_SinX.appendChild(document.createTextNode('sin(x)'));
    tCellH_CosX.appendChild(document.createTextNode('cos(x)'));
    tCellH_TanX.appendChild(document.createTextNode('tan(x)'));
    
    for ( var i = 0; i < 25; i++ ) { // Loop to Build the Interior Table Cells
    
    // Setting Up Variables
    	var tRowC			=	document.createElement('tr');
    	var tCell_Radians	=	document.createElement('td');
    	var tCell_Degrees	=	document.createElement('td');
    	var angleRImg		=	document.createElement('img');
    		angleRImg.setAttribute('src', 'images/img' + angleD + '.gif');
    	var tCell_SinX		=	document.createElement('td');
    	var result_SinX		=	Math.round(Math.sin(angleR)*100000)/100000;
    	var tCell_CosX		=	document.createElement('td');
    	var result_CosX		=	Math.round(Math.cos(angleR)*100000)/100000;
    	var tCell_TanX		=	document.createElement('td');
    
    	// Building the Loop Row
    	myTable.appendChild(tRowC); // <tr>
    	if ((i+1)%2==0){
    		tRowC.setAttribute('class','alt'); // Sets up the Alternate Row Color
    	}
    	
    // Building the Table Cells
    	tRowC.appendChild(tCell_Radians);
    	tRowC.appendChild(tCell_Degrees);
    	tRowC.appendChild(tCell_SinX);
    	tRowC.appendChild(tCell_CosX);
    	tRowC.appendChild(tCell_TanX);
    
    // Populating the Cells
    	tCell_Radians.appendChild(angleRImg);
    	tCell_Degrees.appendChild(document.createTextNode(angleD + ""));
    	tCell_SinX.appendChild(document.createTextNode(result_SinX));
    	tCell_CosX.appendChild(document.createTextNode(resultCosX));
    		if ((angleD === 90) || (angleD === 270)){ // Setting Angles 90 and 270 to "Undefined"
    			var resultTanX = "Undefined";
    		}
    		else {
    			var resultTanX = Math.round(Math.tan(angleR)*100000)/100000;
    		}
    	tCell_TanX.appendChild(document.createTextNode(resultTanX));
    
    // Incrementing the Angles
    	angleR += Math.PI/12; // The Same as 15 Degrees
    	angleD += 15;
    }
    </script>
    
    <br /><br />
    <a href="javascript:history.go(-1)">[ Go Back ]</a>
    </body></html>

  2. #2
    Join Date
    Oct 2013
    Location
    Los Angeles, CA.
    Posts
    5

    Solution

    I solved the problem. It was two-fold

    1 - The <script type="text/JavaScript"> was typed incorrectly.
    2 - the line that says
    Code:
    tCell_CosX.appendChild(document.createTextNode(resultCosX));
    Code:
    resultCosX
    should have been
    Code:
    result_CosX
    Now it works.

  3. #3
    Join Date
    May 2006
    Location
    Somewhere behind your screen
    Posts
    1,656
    Code:
    <!DOCTYPE html>
    <html>
    <head>
    <meta charset="utf-8" />
    <title>Computer Science 553 Lab Pages: Lab 3: Trig Functions On The Fly</title>
    <link rel="stylesheet" type="text/css" href="style.css" />
    <style>
    td{text-align:center;}
    .alt{background-color:#ccc;}
    </style>
    </head>
    <body>
    <h1>Table of Sines, Cosines, and Tangents</h1>
    <h2>Charles P. Scott    |    9092</h2>
    <hr>
    <script>
    function addCell(row,tag,content){
    var cell=document.createElement(tag);
    cell.innerHTML=content;
    row.appendChild(cell);
    }
    
    function addRow(tab){
    var tr=document.createElement('tr');
    tab.appendChild(tr);
    return tr;
    }
    
    var myTable=document.createElement("table"),angleR=0,angleD=0;
    myTable.setAttribute('align','center');
    myTable.setAttribute('border','1');
    myTable.setAttribute('cellSpacing','3');
    myTable.setAttribute('cellPadding','3');
    document.body.appendChild(myTable);
    var hdr=addRow(myTable);
    addCell(hdr,'td','Radians');
    addCell(hdr,'td','Degrees');
    addCell(hdr,'td','sin(x)');
    addCell(hdr,'td','cos(x)');
    addCell(hdr,'td','tan(x)');
    for(var i=0;i < 25;i++){
    var result_SinX=Math.round(Math.sin(angleR)*100000)/100000,
    result_CosX=Math.round(Math.cos(angleR)*100000)/100000,
    tRowC=addRow(myTable);
    if((i+1)%2==0){tRowC.setAttribute('class','alt');}
    addCell(tRowC,'td','<img src="images/img'+angleD+'.gif" alt="" />');
    addCell(tRowC,'td',angleD+'');
    addCell(tRowC,'td',result_SinX);
    addCell(tRowC,'td',result_CosX);
    var resultTanX=((angleD === 90)||(angleD === 270))?"Undefined":(Math.round(Math.tan(angleR)*100000)/100000);
    addCell(tRowC,'td',resultTanX);
    angleR += Math.PI/12;
    angleD += 15;
    }
    </script>
    <br /><br />
    <a href="javascript:history.go(-1)">[ Go Back ]</a>
    </body>
    </html>
    Last edited by Padonak; 11-24-2013 at 04:13 PM.

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