如何使用jquery創建表格的對角線

Question

我想在表格中創建對角線。例如，如果我有表5x5我必須抓住這一行的第一行和第一列，並將thic列的背景設置爲紅色。對於第二行，我必須在第二行的第二列上做同樣的事情。

var cols = 6, 
 
    rows = 6; 
 

 
for (r = 0; r < rows; r++) { 
 
    var row = $('<tr></tr>') 
 
    $('table').append(row); 
 

 
    for (c = 0; c < cols; c++) { 
 
    var col = $('<td></td>'); 
 
    row.append(col); 
 
    $(col[r][c]).addClass('kolorek') 
 
    } 
 
}

table td { 
 
    width: 20px; 
 
    height: 20px; 
 
    border: 1px solid; 
 
} 
 

 
.kolorek { 
 
    background: red; 
 
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> 
 
<table> 
 

 
</table>

Here is a fiddle

Answer 1

你快到了。

var cols = 6, 
 
\t rows = 6, 
 
    $table = $('table'); // Caching the table, because this will be called many times (perf improvement) 
 
    
 
    for (r = 0; r < rows; r++) { 
 
    \t var row = $('<tr></tr>') 
 
    \t 
 
     for(c = 0; c < cols; c++){ 
 
     \t var col = $('<td></td>') 
 
     if(c==r) col.addClass('kolorek') // col[r][c] is undefined. This matches the same column and row numbers 
 
     row.append(col) 
 
     } 
 
     $table.append(row); 
 
    }

table td { 
 
    width: 20px; 
 
    height: 20px; 
 
    border: 1px solid; 
 
} 
 

 
.kolorek { 
 
    background: red; 
 
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> 
 
<table></table>

Answer 2

你可以只檢查是否行索引等於列索引，使從左上角到右下角的對角線：

var cols = 6, 
 
    rows = 6; 
 

 
for (r = 0; r < rows; r++) { 
 
    var row = $('<tr></tr>') 
 
    $('table').append(row); 
 

 
    for (c = 0; c < cols; c++) { 
 
    var col = $('<td></td>'); 
 
    row.append(col); 
 

 
    if (r == c) col.addClass('kolorek'); // add this in place of your current kolerik adder 
 
    } 
 
}

table td { 
 
    width: 20px; 
 
    height: 20px; 
 
    border: 1px solid; 
 
} 
 

 
.kolorek { 
 
    background: red; 
 
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> 
 
<table> 
 

 
</table>