我可以在已经存在于forloop中的.append（）中获得一个forloop吗？

Question

I'm trying to create a Table based on "width"(columns) and "height"(rows) but I just can't get it right. So is there Something wrong with my code?

Code:

for(var i=0;i<width;i++){
        $('#map').append(
            '<tr>'+
                for(var e=0;e<height;e++){

                }
            +'</tr>'
        );
    };

Answer 1

Your code is invalid, you can't have a for loop there. Try rearranging it a bit.

var html;
for(var i=0;i<width;i++){
    html = '<tr>';
    for(var e=0;e<height;e++){
        html += "<td>foo"+e+"</td>";
    }
    html +='</tr>'
    $('#map').append(html);
};

or even better:

var html = "";
for(var i=0;i<width;i++){
    html += '<tr>';
    for(var e=0;e<height;e++){
        html += "<td>foo"+e+"</td>";
    }
    html +='</tr>';
};
$('#map').append(html);

Answer 2

Programmatically create the <tr> element and append the <td> elements to it instead.

var table = [];
for(var i = 0, $tr; i < height; i++){
  $tr = $("<tr/>");
  for(var j = 0; j < width; j++){
    $tr.append("<td/>");
  )
  table.push($tr);
}
$map.append(table);

UPDATE: Optimized for DOM access.

Answer 3

You can make it like this:

for(var i=0; i < height; i++){
  var row = "<tr>";
  for(var j=0; j < width; j++){
    row += "<td>Something data</td>";
  }
  row += "</tr>";
  $('#map').append(row)
}

Answer 4

The jQuery way to do what you're doing is like so:

var $table = $('<tbody />');

for(var i = 0; i < width; i++){
  $tr = $("<tr/>");
  for(var e = 0; e < height; e++){
    $tr.append("<td/>");
  );
  $table.append($tr);
};

$('#map').append($table);

That way you are only accessing the DOM once .