In this article I will explain with an example, how to get selected (checked) CheckBox Row (Cell) values of Html Table using JavaScript.
When the Button is clicked, all the CheckBoxes inside the Html Table will be referenced and then the Row (Cell) values of selected (checked) CheckBoxes will be extracted and displayed using JavaScript Alert Message Box.
 
 
HTML Markup
The following HTML Markup consists of an Html Table and a Button. The Button has been assigned an OnClick event which calls a JavaScript function.
<table cellspacing="0" rules="all" border="1" id="Table1" style="border-collapse: collapse;">
    <tr>
        <th>&nbsp;</th>
        <th style="width:80px">Customer Id</th>
        <th style="width:120px">Name</th>
        <th style="width:120px">Country</th>
    </tr>
    <tr>
        <td><input type="checkbox"/></td>
        <td>1</td>
        <td>John Hammond</td>
        <td>United States</td>
    </tr>
    <tr>
        <td><input type="checkbox"/></td>
        <td>2</td>
        <td>Mudassar Khan</td>
        <td>India</td>
    </tr>
    <tr>
        <td><input type="checkbox"/></td>
        <td>3</td>
        <td>Suzanne Mathews</td>
        <td>France</td>
    </tr>
    <tr>
        <td><input type="checkbox"/></td>
        <td>4</td>
        <td>Robert Schidner</td>
        <td>Russia</td>
    </tr>
</table>
<br />
<input type="button" value="Get Selected" onclick="GetSelected()" />
 
 
JavaScript function to get selected (checked) CheckBox Row values of Html Table
Inside the GetSelected JavaScript function, first the Html Table is referenced and then all the CheckBoxes inside the Html Table are referenced.
Then a loop is executed over the CheckBoxes and if the CheckBox is checked, the values of Cells of the Row are extracted and displayed using JavaScript Alert Message Box.
<script type="text/javascript">
    function GetSelected() {
        //Reference the Table.
        var grid = document.getElementById("Table1");
 
        //Reference the CheckBoxes in Table.
        var checkBoxes = grid.getElementsByTagName("INPUT");
        var message = "Id Name                  Country\n";
 
        //Loop through the CheckBoxes.
        for (var i = 0; i < checkBoxes.length; i++) {
            if (checkBoxes[i].checked) {
                var row = checkBoxes[i].parentNode.parentNode;
                message += row.cells[1].innerHTML;
                message += "   " + row.cells[2].innerHTML;
                message += "   " + row.cells[3].innerHTML;
                message += "\n";
            }
        }
 
        //Display selected Row data in Alert Box.
        alert(message);
    }
</script>
 
 
Screenshot
Get selected (checked) CheckBox Row values of HTML Table using JavaScript
 
 
Browser Compatibility

The above code has been tested in the following browsers.

Internet Explorer  FireFox  Chrome  Safari  Opera 

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Demo
 
 
Downloads