object mirror problem

theEclipse · May 26, 2000

I am creating a chess game with javascript. here are the specs: I create a 2-dimmensional array (8 by 8) of objects, called chess. each array slot's objects consist of .owner .piece and .occpuied . Almost everything works fine, the one thing that dosn't work is the function that moves the piece already selected. here it is: function mover(){ chess[endRow][endCol]=chess[startRow][startCol]; chess[startRow][startCol].occupied=false; alert('chess[startRow][startCol].occupied='+chess[startRow][startCol].occupied+'\nchess[endRow][endCol].occupied='+chess[endRow][endCol].occupied); //alert statement added for debugging purposes print(chess); } the values endRow,endCol,startRow, and startCol are all determined in another function. here is what happens: The script recives the values for endRow,endCol,startRow, and startCol, and then calls mover. mover is supposed to take one piece and copy it to another location: chess[endRow][endCol]=chess[startRow][startCol]; then set the old location to not occupied: chess[startRow][startCol].occupied=false; and lastly, run the printer: print(chess); but for some reason, when I set the old location to not occupied, it also sets the new location to the same. here is the full .html script, but be warned I have only tested it in IE 5.0, and I have not equiped it for use with netscape, or lower versions of IE. I have replaced all array loop counters with [ i] , for this forum. ------------------------------------------------------------ <HTML> <HEAD> <title></title> <script language="javascript"> var chess=new Array(8),moverWin,startCol,startRow,endCol,endRow,cPlayer='white'; startCol=startRow=endCol=endRow=null; function checkOut(row,col){  if ((startRow==null)¦¦(startCol==null)){   if ((row >= 0)&&(row <= 7)&&(col >= 0)&&(col <= 7)){    startRow=row;    startCol=col;    document.all.statusMsg.innerHTML='Select the Destination square';   }  } else if ((endRow==null)¦¦(endCol==null)){   if ((row >= 0)&&(row <= 7)&&(col >= 0)&&(col <= 7)){    endRow=row;    endCol=col;    document.all.statusMsg.innerHTML='';    mover();   }  } } function print(theBoard){  var stOut='<table border=2 cellpadding=0 cellspacing=0 width=90% height=90%>';  for (i=0;i<theBoard.length;i++){   stOut+='<tr>';   for (k=0;k<theBoard[ i].length;k++){    stOut+='<td width=12% height=12% align=center onclick=checkOut('+i+','+k+'); >';    if (theBoard[ i][k].occupied==true){     if (theBoard[ i][k].owner=='black'){      stOut+=theBoard[ i][k].piece.toUpperCase();}     else {      stOut+=theBoard[ i][k].piece     }    } else {     stOut+=' '    }    stOut+='</td>\n';   }//for (k)   stOut+='</tr>';  }//for (i)  stOut+='</table>';  document.all.chessboard.innerHTML=stOut; } function initBoard(theBoard){  //set up the theBoardboard   for (i=0;i<theBoard.length;i++){    theBoard[ i]=new Array(8);    for (j=0;j<theBoard[ i].length;j++) theBoard[ i][j]=new chesspiece();  } //put the pieces in their places  for (i=0; i<theBoard.length; i++){   for (j=0; j<theBoard[ i].length; j++){    switch (i){     case 0:      theBoard[ i][j].occupied=true;      switch (j){       case 0: theBoard[ i][j].piece='rook'; break;       case 7: theBoard[ i][j].piece='rook'; break;       case 1: theBoard[ i][j].piece='knight'; break;       case 6: theBoard[ i][j].piece='knight'; break;       case 2: theBoard[ i][j].piece='bishop'; break;       case 5: theBoard[ i][j].piece='bishop'; break;       case 3   : theBoard[ i][j].piece='queen'; break;       case 4   : theBoard[ i][j].piece='king'; break;      } //switch (j)      theBoard[ i][j].owner='black';     break; {0}     case 7:      theBoard[ i][j].occupied=true;      switch (j){       case 0: theBoard[ i][j].piece='rook'; break;       case 7: theBoard[ i][j].piece='rook'; break;       case 1: theBoard[ i][j].piece='knight'; break;       case 6: theBoard[ i][j].piece='knight'; break;       case 2: theBoard[ i][j].piece='bishop'; break;       case 5: theBoard[ i][j].piece='bishop'; break;       case 3   : theBoard[ i][j].piece='queen'; break;       case 4   : theBoard[ i][j].piece='king'; break;     } //switch (j)      theBoard[ i][j].owner='white';     break; {0}     case 6:      theBoard[ i][j].occupied=true;      theBoard[ i][j].piece='pawn';      theBoard[ i][j].owner='white';     break;     case 1:      theBoard[ i][j].occupied=true;      theBoard[ i][j].piece='pawn';      theBoard[ i][j].owner='black';     break;     case 3 :      theBoard[ i][j].occupied=false;     break;     case 4 :      theBoard[ i][j].occupied=false;     break;     case 5 :      theBoard[ i][j].occupied=false;     break;     case 6 :      theBoard[ i][j].occupied=false;     break;    } //switch (i)   } //for (j)  } //for (i)  return theBoard; } function mover(){  chess[endRow][endCol]=chess[startRow][startCol];  chess[startRow][startCol].occupied=false;  alert('chess[startRow][startCol].occupied='+chess[startRow][startCol].occupied+'\nchess[endRow][endCol].occupied='+chess[endRow][endCol].occupied);  print(chess); } function changeplayer(player){  if (player=='white'){ player='black' } else { player='white'; }  return player; } function begin(){  chess=initBoard(chess);  print(chess);  document.all.statusMsg.innerHTML='Select the Origin square'; } function chesspiece(){  this.occupied=false;  this.piece=' ';  this.owner='';  return this } </script> <style>  #chessboard {font-family:courier,comic sans ms; color:#c0c0c0;} </style> </head> <body onload="begin();" bgcolor=#000000 text=#c0c0c0 topmargin=0 leftmargin=0> <div id=chessboard></div> <div id=statusMsg ></div> </body> </html> thanks for any help theEclipse <a href=mailto:eclipse_web@hotmail.com>eclipse_web@hotmail.com</a> <a href=robacarp.webjump.com>robacarp.webjump.com</a> **-Trying to build a documentation of a Javascript DOM, crossbrowser, of course. E-mail me if you know of any little known events and/or methods, etc.

theEclipse · May 26, 2000

nevermind, i decided to just use: chess[endRow][endCol].piece=chess[startRow][startCol].piece; chess[endRow][endCol].owner=chess[startRow][startCol].owner; in other words, I am copying over each property individually, instead of all at once. thanks anyway theEclipse <a href=mailto:eclipse_web@hotmail.com>eclipse_web@hotmail.com</a> <a href=robacarp.webjump.com>robacarp.webjump.com</a> **-Trying to build a documentation of a Javascript DOM, crossbrowser, of course. E-mail me if you know of any little known events and/or methods, etc.

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object mirror problem

theEclipse

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