Question

I have view that contains a table with the following structure:

<table id="mappings">
    <thead>
        <tr>
            <th width="40%"><input type="checkbox" id="cb-master" /> Structure</th>
            <th width="15%">Excel Column</th>
            <th width="15%">Excel Row Start</th>
            <th width="15%">Excel Row End</th>
        </tr>
    </thead>
    <tbody>
        <tr>
            <td><input type="checkbox" id="cb-1" value="1" /> Item 1</td>
            <td><input type="text" id="col-1" value="A" /></td>
            <td><input type="text" id="rstart-1" value="5" /></td>
            <td><input type="text" id="rend-1" value="20" /></td>
        </tr>
        <tr>
            <td><input type="checkbox" id="cb-2" value="2" /> Item 2</td>
            <td><input type="text" id="col-2" value="B" /></td>
            <td><input type="text" id="rstart-2" value="5" /></td>
            <td><input type="text" id="rend-2" value="20" /></td>
        </tr>
          .
          .
          .
        <tr>
            <td><input type="checkbox" id="cb-n" value="n" /> Item n</td>
            <td><input type="text" id="col-n" value="Z" /></td>
            <td><input type="text" id="rstart-n" value="5" /></td>
            <td><input type="text" id="rend-n" value="20" /></td>
        </tr>
    </tbody>
</table>

Where ItemId is the value contained in the checkbox, and the id of each input is appended with the Id of the current item. How can I iterate through the table above with jQuery and create a JSON array containing the values of the textboxes in each row where the checkboxes checked value is set to true?

I would like the JSON object to look like this (if possible):

[
    { "ItemId": "1", "ExcelColumn": "A", "ExcelRowStart": "5", "ExcelRowEnd": "20" },
    { "ItemId": "2", "ExcelColumn": "B", "ExcelRowStart": "5", "ExcelRowEnd": "20" },
        .
        .
        .
    { "ItemId": "n", "ExcelColumn": "Z", "ExcelRowStart": "5", "ExcelRowEnd": "20" }
]

Answer 1

If you add class for the input, then coding can be simpler

 <tr>
        <td><input type="checkbox" id="cb-1" value="1" class="ItemId" /> Item 1</td>
        <td><input type="text" id="col-1" value="A" class="ExcelColumn"/></td>
        <td><input type="text" id="rstart-1" value="5" class="ExcelRowStart" /></td>
        <td><input type="text" id="rend-1" value="20" class="ExcelRowEnd" /></td>
 </tr>

var result = [];
$("tbody :checked").each(function(){
   var tr = $(this).parent('td').parent('tr');
   var item = {};
   $("input", tr).each(function(){
       item[$(this).attr("class")] = $(this).val();
   });
   result.push(item);
});

check this at http://jsfiddle.net/mxELP/4/