单击同一行中的任何复选框时，选中/取消选中表格行中的复选框

Question

I have a simple table as following which has checkboxes in the first and last columns of each row.

<table style="width:100%">
  <tr>
    <td><input type="checkbox" /></td>
    <td>Smith</td> 
    <td><input type="checkbox" /></td>
  </tr>
  <tr>
    <td><input type="checkbox" /></td>
    <td>Jackson</td> 
    <td><input type="checkbox" /></td>
  </tr>
</table>

Problem: When I check/uncheck the last column's checkbox in the first row, the first column's checkbox in the same row should be checked/unchecked. Similarly, if I check/uncheck the first column's checkbox, the corresponding last column checkbox should be checked/unchecked.

How can I achieve this in javascript? Any help or pointers would be really appreciated.

Here is the fiddle which I have created: Fiddle

Thank you.

Answer 1

Use :checkbox selector to select input type checkbox elements.

Try this:

 $(':checkbox').on('change', function() { $(this).closest('tr').find(':checkbox').prop('checked', this.checked); }); 

 table, th, td { border: 1px solid black; border-collapse: collapse; } 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script> <table style="width:100%"> <tr> <td> <input type="checkbox" /> </td> <td>Smith</td> <td> <input type="checkbox" /> </td> </tr> <tr> <td> <input type="checkbox" /> </td> <td>Jackson</td> <td> <input type="checkbox" /> </td> </tr> </table> 

Using JavaScript:

Use querySelectorAll('[type="checkbox"]') to find checkbox elements.

Try this:

 var checkboxes = document.querySelectorAll('[type="checkbox"]'); [].forEach.call(checkboxes, function(checkbox) { checkbox.onchange = function() { var currentRow = this.parentNode.parentNode; var cbElems = currentRow.querySelectorAll('[type="checkbox"]'); [].forEach.call(cbElems, function(cb) { cb.checked = this.checked; }.bind(this)) }; }); 

 table, th, td { border: 1px solid black; border-collapse: collapse; } 

 <table style="width:100%"> <tr> <td> <input type="checkbox" /> </td> <td>Smith</td> <td> <input type="checkbox" /> </td> </tr> <tr> <td> <input type="checkbox" /> </td> <td>Jackson</td> <td> <input type="checkbox" /> </td> </tr> </table> 

Answer 2

One possible Javascript solution to toggle Checkboxes on Table Row click is shown below:

HTML

<table id = "Table1">
  <tr>
    <td><input type="checkbox" /></td>
    <td>John Smith</td> 
    <td><input type="checkbox" /></td>
  </tr>
  <tr>
    <td><input type="checkbox" /></td>
    <td>Anna Warner</td> 
    <td><input type="checkbox" /></td>
  </tr>
</table>

CSS

table, th, td{
  border: 1px solid #c0c0c0;
  border-collapse: collapse;
}
table{width:100%;}

Javascript

   // row click will toggle checkboxes
   row_OnClick("Table1")
   function row_OnClick(tblId) {
    try {
        var rows = document.getElementById(tblId).rows;
        for (i = 0; i < rows.length; i++) {
            var _row = rows[i];
            _row.onclick = null;
            _row.onclick = function () {
                return function () {selectRow(this);};
            }(_row);
        }
    }
    catch (err) { }
}
function selectRow(row) {
   row.cells[0].firstChild.checked = !row.cells[0].firstChild.checked;
   row.cells[2].firstChild.checked = row.cells[0].firstChild.checked;
}

Working jsfiddle demo at: https://jsfiddle.net/t6nsxgnz/ Practical implementation at: http://busny.net

You can further customize this solution pertinent to your task by modifying the selectRow(row) function:

function selectRow(row) {
   row.cells[0].firstChild.checked = // add your code for the 1st CheckBox
   row.cells[2].firstChild.checked = // add your code for the 2nd CheckBox
}

Another variation of this functionality coded in jQuery can be found in online pop-quiz engine ( http://webinfocentral.com ), implemented via the follwoing code snippet:

// toggle Checkboxes on row click
$(Table1 tr').click(function (event) {

    // find the checkbox in the row
    var _chk = $(this).find('input:checkbox');


    if (!($(event.target).is("checkbox"))) {
        $(_chk).prop('checked', !$(_chk).prop('checked'));
    }
});

In this case, Row Click (at any place of the Row ) or CheckBox Click events will toggle the state of that particular CheckBox . The state of other CheckBoxes can be synchronized with this one (by using "siblings" property, for example). Hope this may help.