chess board using javascript and dom - javascript

I'm trying to create a chessboard just like this.
I did create a table And don'r know how to colour it. A also need to print the board name (like A1, A2, ... H8) and be able to pust any figuere in any of the cell.
For start this is the code to create a table:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>ChessBoard</title>
<script type="text/javascript">
function CreateTable(){
var poz = document.getElementById('space');
// createing table adn inserting into document
tab = document.createElement('table');
poz.appendChild(tab);
tab.border = '5';
for (var i = 0; i < 8; i++){
// creating row and inserting into document
var row = tab.insertRow(i);
for(var j = 0; j < 8; j++){
// creating cells and fill with data (numbers)
var cell = row.insertCell(j);
cell.innerHTML = i*j;
cell.style.backgroundColor = 'blue';
cell.style.color = 'white';
cell.style.height = '50px';
cell.style.width = '50px';
};
};
}
</script>
</head>
<body onload="CreateTable()" id ="space">
</body>
</html>
How do i fill specific cell with figure (like A3, E5, H8, ...)? Figure are imgages.
Part 2:
I did create a board with your help.
Now I'm trying to do some more from this code.
How do I put several different images into several cells? I'm trying to get right working code, but with no success. This images should appear when the tabel will be loaded (when i press button CreateTable).
I try to create with this code:
In this point I would like to put figures on board. When i create table it should be blank. Then there will be buttons to add figures. At the beginning for each different figure own button
something like this:
function addKing(idStr){
cell = document.getElementById(idStr);
if(cell != null){
// works for color, doesn't work for images!!
// cell.style.backgroundColor = 'red';
cell.src = 'http://akramar.byethost8.com/images/SplProg/DN3/images/50px/king_m.png'
}
}
Button addKing in html:
<button id="king" onclick="addKing(prompt('Insert field'))">Add King</button>
upgrading previousu code to even better if i can put all together and select which one I like to insert (promtpt window 1: what figure:'king, queen, ...', prompt window 2: on what position would you like to insert: 'A1, B3, ...')).
function addImage (type, position){
var img = ??
}
When I pres button add image the prompt window should appear and ask for type (king, queen, root, ...) and location (A1, B4, ...) (for further update perhaps even color (black or white) but let build step by step).
All tis chessboard I would like to build just in javascript and with dom.
link to not working exaple: jsfiddle

Assuming you need to support only modern browsers, the chess-board is entirely do-able with CSS using counters, and generated-content:
table {
empty-cells: show;
}
td {
width: 2em;
height: 2em;
line-height: 2em;
text-align: center;
border: 1px solid #000;
}
tbody tr:nth-child(odd) td:nth-child(even),
tbody tr:nth-child(even) td:nth-child(odd) {
color: #fff;
background-color: #00f;
}
tbody tr:nth-child(even) td:nth-child(even),
tbody tr:nth-child(odd) td:nth-child(odd) {
background-color: #999;
}
tbody {
counter-reset: rowNumber;
}
tr {
counter-increment: rowNumber;
counter-reset: cellNumber;
}
td {
counter-increment: cellNumber;
}
td::before {
content: counter(rowNumber, upper-alpha) counter(cellNumber, decimal);
}
JS Fiddle demo.
The above tested in Chromium 24 and Firefox 19, both on Ubuntu 12.10.
And for a JavaScript approach:
var chess = {
createBoard: function (dimension) {
if (!dimension || isNaN(dimension) || !parseInt(dimension, 10)) {
return false;
} else {
dimension = typeof dimension === 'string' ? parseInt(dimension, 10) : dimension;
var table = document.createElement('table'),
tbody = document.createElement('tbody'),
row = document.createElement('tr'),
cell = document.createElement('td'),
rowClone,
cellClone;
table.appendChild(tbody);
for (var r = 0; r < dimension; r++) {
rowClone = row.cloneNode(true);
tbody.appendChild(rowClone);
for (var c = 0; c < dimension; c++) {
cellClone = cell.cloneNode(true);
rowClone.appendChild(cellClone);
}
}
document.body.appendChild(table);
chess.enumerateBoard(table);
}
},
enumerateBoard : function (board) {
var rows = board.getElementsByTagName('tr'),
text = document.createTextNode(),
rowCounter,
len,
cells;
for (var r = 0, size = rows.length; r<size; r++){
rowCounter = String.fromCharCode(65 + r);
cells = rows[r].getElementsByTagName('td');
len = cells.length;
rows[r].className = r%2 == 0 ? 'even' : 'odd';
for (var i = 0; i<len; i++){
cells[i].className = i%2 == 0 ? 'even' : 'odd';
cells[i].appendChild(text.cloneNode());
cells[i].firstChild.nodeValue = rowCounter + i;
}
}
}
};
chess.createBoard(10);
JS Fiddle demo.

You can tie an ID to the cell, and then use that ID to reference and updated the background as needed. Here is one example using your code: http://jsfiddle.net/7Z6hJ
function CreateTable(){
var poz = document.getElementById('space');
// createing table adn inserting into document
tab = document.createElement('table');
poz.appendChild(tab);
tab.border = '5';
for (var i = 0; i < 8; i++){
// creating row and inserting into document
var row = tab.insertRow(i);
for(var j = 0; j < 8; j++){
// creating cells and fill with data (numbers)
var cell = row.insertCell(j);
var idStr = String.fromCharCode(97 + i).toUpperCase() + (j+1);
cell.innerHTML = idStr;
cell.id = idStr;
cell.style.backgroundColor = 'blue';
cell.style.color = 'white';
cell.style.height = '50px';
cell.style.width = '50px';
};
};
}
function updateRow(idStr)
{
cell = document.getElementById(idStr);
if(cell != null)
{
cell.style.backgroundColor = 'red';
}
}
As some have mentioned, there is probably a better way to go about this (using css and jQuery, etc) but this answer sticks with what you have so far.

Create a new variable inside the top loop to save the "letter" name of the row (eg. A, B, C).
// creating row and inserting into document
var row = tab.insertRow(i);
var row_letter = String.fromCharCode(65 + i);
Then in the second loop combine the row name and column number.
cell.innerHTML = row_letter + j;

Actually, you need to do some math for correctly coloring and adding labels. Here is the part of code for doing magic:
1 cell.innerHTML = String.fromCharCode(65 + i) + (j + 1);
2 if((i+j)%2){ cell.style.backgroundColor = 'white'; }
3 else{ cell.style.backgroundColor = 'blue'; }
4 cell.style.color = 'black';
5 cell.style.height = '50px';
6 cell.style.width = '50px';
Let me explain. In first line, you take constant 65, which is ASCII code for letter 'A'. While you change the letter by rows, you add i counter to it, so you get 65+0, 65+1, ..., 65+7. Their ASCII equivalents (which you get with String.fromCharCode()) are A, B, ..., H. Now when you have that letter, easily add number of cell to it (j + 1). You can remove '1' and leave just j and make inner loop go from 1 to 8.
Lines 2, 3: Colors are alternating - every second row have the same color. So, just test if is i+j dividable by 2.
For adding figure, you have to make some function that will do cell.innerHTML = <SOME IMAGE>. But, I guess, it's for second question.
Hope I helped you understand the logic.

I case if someone is looking for a way to visualize a chessboard using JS (as I was doing and accidentally came to this question), here is an excellent JS library to do this.
It can create something like this
and much more in no time just by doing the following:
JavaScript
var ruyLopez = 'r1bqkbnr/pppp1ppp/2n5/1B2p3/4P3/5N2/PPPP1PPP/RNBQK2R';
var board = new ChessBoard('board', ruyLopez);
HTML
<div id="board" style="width: 400px"></div>

Related

clientY is not displaying the right thing

I know that the title seems a bit weird, but i'm trying to create a drawing app. I have a javascript generated table that is 17 by 36 and I am trying to make it so that whenever you click in a box it colors it black. Below is the code (here it acts weirder because they are not 30 by 30 pixels)
var array = [];
var body = document.body, tbl = document.createElement("table");
tbl.style.border = "1px solid black";
tbl.style.borderCollapse = "collapse";
tbl.setAttribute("border", "1px");
tbl.style.margin = "0px";
tbl.setAttribute("onClick", "color(event)");
var id = 1;
for (var j = 0; j < 17; j++) {
var row = tbl.insertRow();
row.setAttribute("id", id.toString());
id++;
for (var ij = 0; ij < 36; ij++) {
var cell = row.insertCell();
cell.style.width = "28px";
cell.style.height = "28px";
}
}
body.appendChild(tbl);
function color(event) {
var x = event.clientX;
var y = event.clientY;
console.log(x + " = x");
console.log(y + " = y");
console.log((x/30) + " = x/30");
console.log((y/30) + " = y/30");
x = Math.ceil(x / 30);
y = Math.ceil(y / 30);
if (x == 37) {x = 36}
if (y == 18) {y = 17}
console.log(x + "x after");
console.log(y + "y after");
document.getElementById(y.toString()).childNodes[x - 1].style.background = "black";
}
<!DOCTYPE html>
<html>
<head>
<title>Program</title>
<style>
body {
margin: 0px;
}
</style>
</head>
<body>
<script src="program.js"></script>
<button onClick="calculate()"></button>
</body>
</html>
When I click a square in the 10th row, it colors it black. When I click it in a row near the bottom, starting from the 13th row, it goes 5 squares up. Also, if I click in the second half of a square (from the left or from the top) it thinks it's the next square over! Please help!
As already mentioned in a comment, you are making this problem more complicated than it actually is. When you click an element, it generates a click event which contains a reference to the element that the event is for. In your case it already references the td-element that you want to change.
So: Simply use event.target and you are good to go.
/* Creating the table */
var array = [];
var body = document.body,
tbl = document.createElement("table");
tbl.style.border = "1px solid black";
tbl.style.borderCollapse = "collapse";
tbl.setAttribute("border", "1px");
tbl.style.margin = "0px";
tbl.setAttribute("onClick", "color(event)");
var id = 1;
for (var j = 0; j < 17; j++) {
var row = tbl.insertRow();
row.setAttribute("id", id.toString());
id++;
for (var ij = 0; ij < 36; ij++) {
var cell = row.insertCell();
cell.style.width = "28px";
cell.style.height = "28px";
}
}
body.appendChild(tbl);
function color(event) {
var node = event.target;
var parent = node.parentNode;
//Probably a tbody, but we don't care as long as it is the parent
var table = parent.parentNode;
var column = [].slice.call(parent.childNodes).indexOf(node);
var row = [].slice.call(table.childNodes).indexOf(parent);
console.log(column);
console.log(row);
node.style.background = "black";
}
Edit: Since you asked how to update your array, I'll expand a bit on this. You have a reference to the DOM. If you need to track if the particular item is black, you can simply check it's style in the DOM. No need to keep a global array for this. Use console.log( node ) if you are curious as to what you have available to you, or (better) use the documentation on MDN.
If you need the array for a different reason, you can use the node.parentNode and node.childNodes methods. Please note that the last method returns a NodeList; it looks like an Array, but it is actually not an array. To use array-specific functions on it, we convert it to an array with [].slice.call( NodeList ). Instead of [] you could use Array.prototype. I can't tell if it would behave any differently in some browsers.

Could you please help me to highlight the selected HTML table row created dynamically through java script

Below is the JavaScript functionalities addRow() I have used to add the rows dynamically and now am trying to highlight the selected row with red color using rowhighlight() function.
/Function to addRows dynamically to the HTML table/
function addRow(msg)
{
var table = document.getElementById("NotesFinancialSummary");
var finSumArr1 = msg.split("^");
var length = finSumArr1.length-1;
alert("length"+ length);
for(var i=1; i<finSumArr1.length; i++)
{
var rowValues1 = finSumArr1[i].split("|");
tb=document.createElement("tbody");
var tbody=document.createElement("tbody");
table.appendChild(tbody);
var tr=document.createElement("tr");
tbody.appendChild(tr);
for(var k=0;k<=10;k++)//adding data to table dynamically
{
var td=document.createElement("td");
tr.appendChild(td);
var element1=rowValues1[k];
td.innerHTML =element1;
tr.onclick=function(){
rowhighlight(this);//calling the rowhighlight function
}
}
}
}
function rowhighlight(x)
{
var index = x.rowIndex;
document.getElementById("NotesFinancialSummary").rows [index].style.backgroundColor = "red";
}
One approach is to first loop through the other rows and remove the styling (really should be a class) then apply the styling (again, class) to the selected row.
Here's one way of doing it:
function rowHighlight() {
var selectedRows = document.getElementsByClassName('selected');
for (var n = 0; n < selectedRows.length; n++) {
selectedRows[n].className = '';
}
this.className = 'selected'
}
And here's a working example of it, though very simple: fiddle time!

Handle cells with rowspan when hiding table rows

I have a table containing cells with rowspan attributes, I would like to:
Whenever a tr is hidden, the table will rearrange itself correctly
Whenever a tr is shown again, it will be restored to original state
So if you have a table like this clicking on X shouldn't destroy the layout.
and click a come back button, should restore the original layout.
(try removing all rows from bottom-up, and than restoring them from right-to-left, this is a desired flow)
I had some semi-solutions, but all seem too complicated, and i'm sure there is a nice way to handle this.
OK I really spent a hell of a long time over this question, so here goes...
For those of you who just want to see the working solution, click here
Update: I've changed the visual columns calculation method to iterate over the table and create a 2-dimensional array, to see the old method which used the jQuery offset() method, click here. The code is shorter, but more time costly.
The problem exists because when we hide a row, whilst we want all the cells to be hidden, we want the pseudo-cells — that is, the cells that appear to be in the following rows due to the cells rowspan attribute — to persist. To get around this, whenever we come across a hidden cell with a rowspan, we try to move it down the the next visible row (decrementing it's rowspan value as we go). With either our original cell or it's clone, we then iterate down the table once more for every row that would contain a pseudo-cell, and if the row is hidden we decrement the rowspan again. (To understand why, look at the working example, and note that when the blue row is hidden, red cell 9's rowspan must be reduced from 2 to 1, else it would push green 9 right).
With that in mind, we must apply the following function whenever rows are shown/hidden:
function calculate_rowspans() {
// Remove all temporary cells
$(".tmp").remove();
// We don't care about the last row
// If it's hidden, it's cells can't go anywhere else
$("tr").not(":last").each(function() {
var $tr = $(this);
// Iterate over all non-tmp cells with a rowspan
$("td[rowspan]:not(.tmp)", $tr).each(function() {
$td = $(this);
var $rows_down = $tr;
var new_rowspan = 1;
// If the cell is visible then we don't need to create a copy
if($td.is(":visible")) {
// Traverse down the table given the rowspan
for(var i = 0; i < $td.data("rowspan") - 1; i ++) {
$rows_down = $rows_down.next();
// If our cell's row is visible then it can have a rowspan
if($rows_down.is(":visible")) {
new_rowspan ++;
}
}
// Set our rowspan value
$td.attr("rowspan", new_rowspan);
}
else {
// We'll normally create a copy, unless all of the rows
// that the cell would cover are hidden
var $copy = false;
// Iterate down over all rows the cell would normally cover
for(var i = 0; i < $td.data("rowspan") - 1; i ++) {
$rows_down = $rows_down.next();
// We only consider visible rows
if($rows_down.is(":visible")) {
// If first visible row, create a copy
if(!$copy) {
$copy = $td.clone(true).addClass("tmp");
// You could do this 1000 better ways, using classes e.g
$copy.css({
"background-color": $td.parent().css("background-color")
});
// Insert the copy where the original would normally be
// by positioning it relative to it's columns data value
var $before = $("td", $rows_down).filter(function() {
return $(this).data("column") > $copy.data("column");
});
if($before.length) $before.eq(0).before($copy);
else $(".delete-cell", $rows_down).before($copy);
}
// For all other visible rows, increment the rowspan
else new_rowspan ++;
}
}
// If we made a copy then set the rowspan value
if(copy) copy.attr("rowspan", new_rowspan);
}
});
});
}
The next, really difficult part of the question is calculating at which index to place the copies of the cells within the row. Note in the example, blue cell 2 has an actual index within its row of 0, i.e. it's the first actual cell within the row, however we can see that visually it lies in column 2 (0-indexed).
I took the approach of calculating this only once, as soon as the document is loaded. I then store this value as a data attribute of the cell, so that I can position a copy of it in the right place (I've had many Eureka moments on this one, and made many pages of notes!). To do this calculation, I ended up constructing a 2-dimensional Array matrix which keeps track of all of the used-visual columns. At the same time, I store the cells original rowspan value, as this will change with hiding/showing rows:
function get_cell_data() {
var matrix = [];
$("tr").each(function(i) {
var $cells_in_row = $("td", this);
// If doesn't exist, create array for row
if(!matrix[i]) matrix[i] = [];
$cells_in_row.each(function(j) {
// CALCULATE VISUAL COLUMN
// Store progress in matrix
var column = next_column(matrix[i]);
// Store it in data to use later
$(this).data("column", column);
// Consume this space
matrix[i][column] = "x";
// If the cell has a rowspan, consume space across
// Other rows by iterating down
if($(this).attr("rowspan")) {
// Store rowspan in data, so it's not lost
var rowspan = parseInt($(this).attr("rowspan"));
$(this).data("rowspan", rowspan);
for(var x = 1; x < rowspan; x++) {
// If this row doesn't yet exist, create it
if(!matrix[i+x]) matrix[i+x] = [];
matrix[i+x][column] = "x";
}
}
});
});
// Calculate the next empty column in our array
// Note that our array will be sparse at times, and
// so we need to fill the first empty index or push to end
function next_column(ar) {
for(var next = 0; next < ar.length; next ++) {
if(!ar[next]) return next;
}
return next;
}
}
Then simply apply this on page load:
$(document).ready(function() {
get_cell_data();
});
(Note: whilst the code here is longer than my jQuery .offset() alternative, it's probably quicker to calculate. Please correct me if I'm wrong).
Working solution - http://codepen.io/jmarroyave/pen/eLkst
This is basically the same solution that i presented before, i just changed how to get the column index to remove the restriction of the jquery.position, and did some refactor to the code.
function layoutInitialize(tableId){
var layout = String();
var maxCols, maxRows, pos, i, rowspan, idx, xy;
maxCols = $(tableId + ' tr').first().children().length;
maxRows = $(tableId + ' tr').length;
// Initialize the layout matrix
for(i = 0; i < (maxCols * maxRows); i++){
layout += '?';
}
// Initialize cell data
$(tableId + ' td').each(function() {
$(this).addClass($(this).parent().attr('color_class'));
rowspan = 1;
if($(this).attr('rowspan')){
rowspan = $(this).attr("rowspan");
$(this).data("rowspan", rowspan);
}
// Look for the next position available
idx = layout.indexOf('?');
pos = {x:idx % maxCols, y:Math.floor(idx / maxCols)};
// store the column index in the cell for future reposition
$(this).data('column', pos.x);
for(i = 0; i < rowspan; i++){
// Mark this position as not available
xy = (maxCols * pos.y) + pos.x
layout = layout.substr(0, xy + (i * maxCols)) + 'X' + layout.substr(xy + (i * maxCols) + 1);
}
});
}
Solution: with jquery.position() - http://codepen.io/jmarroyave/pen/rftdy
This is an alternative solution, it assumes that the first row contains all the information about the number of the table columns and the position of each on.
This aproach has the restriction that the inizialitation code must be call when the table is visible, because it depends on the visible position of the columns.
If this is not an issue, hope it works for you
Initialization
// Initialize cell data
$('td').each(function() {
$(this).addClass($(this).parent().attr('color_class'));
$(this).data('posx', $(this).position().left);
if($(this).attr('rowspan')){
$(this).data("rowspan", $(this).attr("rowspan"));
}
});
UPDATE
According to this post ensuring the visibility of the table can be manage with
$('table').show();
// Initialize cell data
$('td').each(function() {
$(this).addClass($(this).parent().attr('color_class'));
$(this).data('posx', $(this).position().left);
if($(this).attr('rowspan')){
$(this).data("rowspan", $(this).attr("rowspan"));
}
});
$('table').hide();
As Ian said, the main issue to solve in this problem is to calculate the position of the cells when merging the hidden with the visible rows.
I tried to figure it out how the browser implements that funcionality and how to work with that. Then looking the DOM i searched for something like columnVisiblePosition and i found the position attributes and took that way
function getColumnVisiblePostion($firstRow, $cell){
var tdsFirstRow = $firstRow.children();
for(var i = 0; i < tdsFirstRow.length; i++){
if($(tdsFirstRow[i]).data('posx') == $cell.data('posx')){
return i;
}
}
}
The js code
$(document).ready(function () {
add_delete_buttons();
$(window).on("tr_gone", function (e, tr) {
add_come_back_button(tr);
});
// Initialize cell data
$('td').each(function() {
$(this).addClass($(this).parent().attr('color_class'));
$(this).data('posx', $(this).position().left);
if($(this).attr('rowspan')){
$(this).data("rowspan", $(this).attr("rowspan"));
}
});
});
function calculate_max_rowspans() {
// Remove all temporary cells
$(".tmp").remove();
// Get all rows
var trs = $('tr'), tds, tdsTarget,
$tr, $trTarget, $td, $trFirst,
cellPos, cellTargetPos, i;
// Get the first row, this is the layout reference
$trFirst = $('tr').first();
// Iterate through all rows
for(var rowIdx = 0; rowIdx < trs.length; rowIdx++){
$tr = $(trs[rowIdx]);
$trTarget = $(trs[rowIdx+1]);
tds = $tr.children();
// For each cell in row
for(cellIdx = 0; cellIdx < tds.length; cellIdx++){
$td = $(tds[cellIdx]);
// Find which one has a rowspan
if($td.data('rowspan')){
var rowspan = Number($td.data('rowspan'));
// Evaluate how the rowspan should be display in the current state
// verify if the cell with rowspan has some hidden rows
for(i = rowIdx; i < (rowIdx + Number($td.data('rowspan'))); i++){
if(!$(trs[i]).is(':visible')){
rowspan--;
}
}
$td.attr('rowspan', rowspan);
// if the cell doesn't have rows hidden within, evaluate the next cell
if(rowspan == $td.data('rowspan')) continue;
// If this row is hidden copy the values to the next row
if(!$tr.is(':visible') && rowspan > 0) {
$clone = $td.clone();
// right now, the script doesn't care about copying data,
// but here is the place to implement it
$clone.data('rowspan', $td.data('rowspan') - 1);
$clone.data('posx', $td.data('posx'));
$clone.attr('rowspan', rowspan);
$clone.addClass('tmp');
// Insert the temp node in the correct position
// Get the current cell position
cellPos = getColumnVisiblePostion($trFirst, $td);
// if is the last just append it
if(cellPos == $trFirst.children().length - 1){
$trTarget.append($clone);
}
// Otherwise, insert it before its closer sibling
else {
tdsTarget = $trTarget.children();
for(i = 0; i < tdsTarget.length; i++){
cellTargetPos = getColumnVisiblePostion($trFirst, $(tdsTarget[i]));
if(cellPos < cellTargetPos){
$(tdsTarget[i]).before($clone);
break;
}
}
}
}
}
}
// remove tmp nodes from the previous row
if(rowIdx > 0){
$tr = $(trs[rowIdx-1]);
if(!$tr.is(':visible')){
$tr.children(".tmp").remove();
}
}
}
}
// this function calculates the position of a column
// based on the visible position
function getColumnVisiblePostion($firstRow, $cell){
var tdsFirstRow = $firstRow.children();
for(var i = 0; i < tdsFirstRow.length; i++){
if($(tdsFirstRow[i]).data('posx') == $cell.data('posx')){
return i;
}
}
}
function add_delete_buttons() {
var $all_rows = $("tr");
$all_rows.each(function () {
// TR to remove
var $tr = $(this);
var delete_btn = $("<button>").text("x");
delete_btn.on("click", function () {
$tr.hide();
calculate_max_rowspans();
$(window).trigger("tr_gone", $tr);
});
var delete_cell = $("<td>");
delete_cell.append(delete_btn);
$(this).append(delete_cell);
});
}
function add_come_back_button(tr) {
var $tr = $(tr);
var come_back_btn = $("<button>").text("come back " + $tr.attr("color_class"));
come_back_btn.css({"background": $(tr).css("background")});
come_back_btn.on("click", function () {
$tr.show();
come_back_btn.remove();
calculate_max_rowspans();
});
$("table").before(come_back_btn);
}
if you have any questions or comments let me know.
I'm assuming you want the the rows to shift upward when you hide the row but you do not want the cells to shift left.
Here is what I got http://codepen.io/anon/pen/prDcK
I added two css rules:
#come_back_container{height: 30px;}
td[rowspan='0']{background-color: white;}
Here is the html I used:
<div id="come_back_container"></div>
<table id="dynamic_table" cellpadding=7></table>
<table id="dynamic_table2" cellpadding=7>
<tr style="background-color: red">
<td rowspan="5">a</td>
<td rowspan="1">b</td>
<td rowspan="5">c</td>
<td rowspan="1">d</td>
<td rowspan="2">e</td>
</tr>
<tr style="background-color: grey">
<td rowspan="0">f</td>
<td rowspan="1">g</td>
<td rowspan="0">h</td>
<td rowspan="1">i</td>
<td rowspan="0">j</td>
</tr>
<tr style="background-color: blue">
<td rowspan="0">k</td>
<td rowspan="1">l</td>
<td rowspan="0">m</td>
<td rowspan="1">n</td>
<td rowspan="1">o</td>
</tr>
<tr style="background-color: yellow">
<td rowspan="0">p</td>
<td rowspan="1">q</td>
<td rowspan="0">r</td>
<td rowspan="1">s</td>
<td rowspan="2">t</td>
</tr>
<tr style="background-color: green">
<td rowspan="0">u</td>
<td rowspan="1">v</td>
<td rowspan="0">w</td>
<td rowspan="1">x</td>
<td rowspan="0">y</td>
</tr>
</table>
The first rule is just to keep the top edge of the table in the same place. The second rule is to make the cells appear blank by blending in with the background, so change accordingly.
Finally here is the js:
$(function () {
//firstTable()
var myTb2 = new dynamicTable();
myTb2.createFromElement( $("#dynamic_table2") );
myTb2.drawTable()
$(window).on("tr_hide", function (e,data){
var tbl = data.ctx,
rowIndex = data.idx;
tbl.hideRow.call(tbl, rowIndex);
})
$(window).on("tr_show", function (e,data){
var tbl = data.ctx,
rowIndex = data.idx;
tbl.showRow.call(tbl, rowIndex);
})
})
function dynamicTableItem(){
this.height = null;
this.content = null;
}
function dynamicTableRow(){
this.color = null;
this.items = []
this.show = true
this.setNumColumns = function(numCols){
for(var i=0;i<numCols;i++){
var item = new dynamicTableItem();
item.height = 0;
this.items.push(item)
}
}
this.addItem = function(index, height, content){
var item = new dynamicTableItem();
item.height = height;
item.content = content;
if(index>=this.items.length){ console.error("index out of range",index); }
this.items[index] = item;
}
}
function dynamicTable(){
this.element = null;
this.numCols = null;
this.rows = []
this.addRow = function(color){
var row = new dynamicTableRow();
row.color = color;
row.setNumColumns(this.numCols)
var length = this.rows.push( row )
return this.rows[length-1]
}
this.drawTable = function(){
this.element.empty()
var cols = [],
rowElements = [];
for(var i=0;i<this.numCols;i++){
cols.push( [] )
}
for(var r=0; r<this.rows.length; r++){
var row = this.rows[r]
if(row.show){
var $tr = $("<tr>"),
delete_cell = $("<td>"),
delete_btn = $("<button>").text("x")
var data = {ctx: this, idx: r};
delete_btn.on("click", data, function(e){
$(window).trigger("tr_hide", e.data);
})
delete_cell.addClass("deleteCell");
$tr.css( {"background": row.color} );
delete_cell.append(delete_btn);
$tr.append(delete_cell);
this.element.append($tr);
rowElements.push( $tr );
for(var i=0; i<row.items.length; i++){
cols[i].push( row.items[i] );
}
}
}
for(var c=0; c<cols.length; c++){
var cellsFilled = 0;
for(var r=0; r<cols[c].length; r++){
var item = cols[c][r]
var size = item.height;
if(r>=cellsFilled){
cellsFilled += (size>0 ? size : 1);
var el = $("<td>").attr("rowspan",size);
el.append(item.content);
rowElements[r].children().last().before(el);
}
}
}
}
this.hideRow = function(rowIndex){
var row = this.rows[rowIndex]
row.show = false;
var come_back_btn = $("<button>").text("come back");
come_back_btn.css( {"background": row.color} );
var data = {ctx:this, idx:rowIndex};
come_back_btn.on("click", data, function(e){
$(window).trigger("tr_show", e.data);
$(this).remove();
});
$("#come_back_container").append(come_back_btn);
this.drawTable();
}
this.showRow = function(rowIndex){
this.rows[rowIndex].show = true;
this.drawTable();
}
this.createFromElement = function(tbl){
this.element = tbl;
var tblBody = tbl.children().filter("tbody")
var rows = tblBody.children().filter("tr")
this.numCols = rows.length
for(var r=0;r<rows.length;r++){
var row = this.addRow( $(rows[r]).css("background-color") );
var items = $(rows[r]).children().filter("td");
for(var i=0;i<items.length;i++){
var item = $(items[i]);
var height = parseInt(item.attr("rowspan"));
var contents = item.contents();
row.addItem(i,height,contents);
}
}
//console.log(this);
}
}
function firstTable(){
var myTable = new dynamicTable();
myTable.element = $("#dynamic_table");
myTable.numCols = 5
var red = myTable.addRow("red");
red.addItem(0,5);
red.addItem(1,1);
red.addItem(2,5);
red.addItem(3,1);
red.addItem(4,2);
var white = myTable.addRow("grey");
//white.addItem(0,0);
white.addItem(1,1);
//white.addItem(2,0);
white.addItem(3,1);
//white.addItem(4,0);
var blue = myTable.addRow("blue");
//blue.addItem(0,3); //try uncommenting this and removing red
blue.addItem(1,1);
//blue.addItem(2,0);
blue.addItem(3,1);
blue.addItem(4,1);
var yellow = myTable.addRow("yellow");
//yellow.addItem(0,0);
yellow.addItem(1,1);
//yellow.addItem(2,0);
yellow.addItem(3,1);
yellow.addItem(4,2);
var green = myTable.addRow("green");
//green.addItem(0,0);
green.addItem(1,1);
//green.addItem(2,0);
green.addItem(3,1);
//green.addItem(4,0);
myTable.drawTable();
}
I tried to use clear variable and method names but if you have any quests just ask.
PS- I know there is no easy way to add content to the cells right now but you only asked for disappearing rows.

Trouble with Javascript table colspan

I'm trying to make some of my columns span for readability, as well as pattern recognition. I'm also changing the background color of the cells to show patterns. If the data in my array is null, I use red. If it is not null and spans at least 2 columns, it is blue, otherwise, it is grey. I'm finding that some of my columns are wider than they should be, and some are shorter. With my data, the first columns are the only ones too wide, and the last are the only ones too short. So far as I can tell however, their colors are correct. I can give example code, but not example data as it is highly confidential. I can give the code, and will. Why are some of my columns wider, and others shorter than I expect them to be?
function loadTable() {
var fields = JSON.parse(localStorage.getItem("boxFields"));
var report = JSON.parse(localStorage.getItem("boxReport"));
var space = document.getElementById("batchReport");
var baseList = document.createElement("ul");
space.appendChild(baseList);
for (var i = 0; i < fields.length; i++) {
var li = document.createElement("li");
baseList.appendChild(li);
var header = document.createElement("h2");
header.textContent = fields[i] + ":";
li.appendChild(header);
if (report.length > 0) {
var table = document.createElement("table");
table.className += "wide";
li.appendChild(table);
var tr = document.createElement("tr");
table.appendChild(tr);
var td = document.createElement("td");
td.colSpan = report.length;
tr.appendChild(td);
tr = document.createElement("tr");
table.appendChild(tr);
var compare = "NeverEqual";
var count = 0;
td = null;
for (var j = 0; j < report.length; j++) {
if (compare == report[j][i]) {
count++;
td.colSpan = count;
if (compare != null)
td.style.backgroundColor = "#336";
} else {
count = 1;
compare = report[j][i];
td = document.createElement("td");
tr.appendChild(td);
td.textContent = report[j][i];
//td.colSpan = 1;
if (compare != null)
td.style.backgroundColor = "#333";
else {
td.style.backgroundColor = "#633";
}
}
}
}
}
space.style.height = "93%";
space.style.overflow = "auto";
}
Your not specifying explicit widths for the table cells so they'll be auto calculated based on their content and the fallback logic the browser / IE does. If you want to have a cell have a specific width apply either a class to it or set it's with property explicity, e.g.:
td.style.width = "50px";
Or
td.className = "myCell";
// and in css somewhere define the class
.myCell{
width: 50px;
}

Adding addEventListener to a clicked table cell to change the color

I am creating a dynamic table of three columns and multiple rows. I want to be able to click the last cells in each row and have the row be selected showing a certain color. I am trying to do this as well as make sure that if another cell is selected already it will deselect. I am having a few issues not sure exactly what to do. I can create an onclick alert message that works, however no success with the bg color. Any suggestions are helpful. Function createCell should be where this is addressed.
<html>
<br/><br/></p>
<table id="my_table" align="center" cellspacing="0" cellpadding="0" border="0">
<tr>
<td>Name</td>
<td>Age</td>
<td>Sex</td>
</tr>
</table>
<p></center></p>
<script type="text/javascript" language="javascript">
function appendRow(){
var names = ["Paul", "Mike", "Linda"];
var ages = ["16", "23", "44"];
var male_female = ["M", "M", "F"];
var tbl = document.getElementById('my_table'); // table reference
// append table row
var id;
var z=1;
for(k=0;k<names.length;k++){
var row = tbl.insertRow(tbl.rows.length);
var j = tbl.rows.length - 2;
for (var i=0;i<tbl.rows[0].cells.length;i++) {
id=z++;
var cell_text = '';
if (i == 0) {
cell_text = names[j];
} else if (i == 1) {
cell_text = ages[j];
} else if (i == 2) {
cell_text = male_female[j];
}
createCell(id, row.insertCell(i), cell_text, 'row');
}
}
}
function createCell(id, cell, text, style){
var div = document.createElement('div'); // create DIV element
var txt = document.createTextNode(text); // create text node
if(id % 3 == 0)
{
cell.setAttribute('onclick', 'alert("hello")'); //for testing purposes
cell.addEventListener("click", clickCell, false);
}
div.appendChild(txt); // append text node to the DIV
div.setAttribute('class', style); // set DIV class attribute
div.setAttribute('className', style); // set DIV class attribute for IE (?!)
cell.appendChild(div); // append DIV to the table cell
}
function clickCell()
{
if(e)
e.setAttribute("bgColor","purple");
if(e != this){
e = this;
e.setAttribute("bgColor","blue");
}else{
e = null;
}
}
</script>
<BODY onload="appendRow()">
<style>
table#my_table{border-collapse:collapse;}
table#my_table td{width:50px;height:27px;border:1px solid #D3D3D3;font-size:10pt;text-align:center;padding:0;}
.append_row{background-color:#FFD6D6;border:1px #ccc solid;}
</style>
</body>
</html>
Modify the clickCell method to:
function clickCell(e) {
// clear the background of all rows
var rows = document.getElementById('my_table').rows;
for(var i = 0; i < rows.length; i++) {
rows[i].style.backgroundColor = '';
}
// set background of clicked row
this.style.backgroundColor = 'purple';
}
See an example.
In createCell change cell.setAttribute('onclick', 'alert("hello")'); to cell.setAttribute('onclick', 'alert("hello");this.parentNode.setAttribute("bgcolor", "purple")');
Figured out that if I set the clickcell function to the following, it will clear all cells that are colored. I thought I could call "this.style.backgroundColor" to change the cell color and then clear that cell with a "row.style.backgroundColor" turns out I was wrong.
function clickCell(e) {
var tr = document.getElementById('my_table').rows;
for(i=0;i<tr.length;i++)
{
for(k=0;k<tr[i].cells.length;k++)
{
tr[i].cells[k].style.backgroundColor = "";
}
}
this.style.backgroundColor = "blue";
}

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