javascript - Check/Uncheck all the checkboxes in a table

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javascript - Check/Uncheck all the checkboxes in a table

posted Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

javascript - Check/Uncheck all the checkboxes in a table

I have a table with information. The first column of the table have checkboxes. I can add/delete rows with a button by checking the checkboxes. The problem I have now is how do I select or deselect all the checkboxes using the checkbox on the header.

Here is my code:

<HTML>
  <HEAD>
    <TITLE> Add/Remove dynamic rows in HTML table </TITLE>
    <SCRIPT language="javascript">
      function addRow(tableID) {

        var table = document.getElementById(tableID);

        var rowCount = table.rows.length;
        var row = table.insertRow(rowCount);

        var cell1 = row.insertCell(0);
        var element1 = document.createElement("input");
        element1.type = "checkbox";
        element1.name="chkbox[]";
        cell1.appendChild(element1);

        var cell2 = row.insertCell(1);
        cell2.innerHTML = rowCount;

        var cell3 = row.insertCell(2);
        cell3.innerHTML = rowCount;

        var cell4 = row.insertCell(3);
        cell4.innerHTML = rowCount;

        var cell5 = row.insertCell(4);
        cell5.innerHTML = rowCount;

        var cell6 = row.insertCell(5);
        cell6.innerHTML = rowCount;
      }

      function deleteRow(tableID) {
        try {
        var table = document.getElementById(tableID);
        var rowCount = table.rows.length;

        for(var i=1; i<rowCount; i++) {
            var row = table.rows[i];
            var chkbox = row.cells[0].childNodes[0];
            if(null != chkbox && true == chkbox.checked) {
                table.deleteRow(i);
                rowCount--;
                i--;
            }
        }
        }catch(e) {
            alert(e);
        }
      }

      function checkAll(formname, checktoggle)
      {
        var checkboxes = new Array();
        checkboxes = document[formname].getElementsByTagName('input');

        for (var i=0; i<checkboxes.length; i++)  {
            if (checkboxes[i].type == 'checkbox')   {
            checkboxes[i].checked = checktoggle;
            }
        }
      }

    </SCRIPT>
  </HEAD>
  <BODY>

    <INPUT type="button" value="Add Row" onclick="addRow('dataTable')" />

    <INPUT type="button" value="Delete Row" onclick="deleteRow('dataTable')" />

    <TABLE id="dataTable" border="1">
      <tr>
        <th><INPUT type="checkbox" name="chk[]"/></th>
        <th>Make</th>
        <th>Model</th>
        <th>Description</th>
        <th>Start Year</th>
        <th>End Year</th>
      </tr>
    </TABLE>
  </BODY>
</HTML>

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1 Reply

深蓝 · Answer 1 · 2021-10-23T17:44:43+0000

Actually your checkAll(..) is hanging without any attachment.

1) Add onchange event handler

<th><INPUT type="checkbox" onchange="checkAll(this)" name="chk[]" /> </th>

2) Modified the code to handle check/uncheck

 function checkAll(ele) {
     var checkboxes = document.getElementsByTagName('input');
     if (ele.checked) {
         for (var i = 0; i < checkboxes.length; i++) {
             if (checkboxes[i].type == 'checkbox') {
                 checkboxes[i].checked = true;
             }
         }
     } else {
         for (var i = 0; i < checkboxes.length; i++) {
             console.log(i)
             if (checkboxes[i].type == 'checkbox') {
                 checkboxes[i].checked = false;
             }
         }
     }
 }

Updated Fiddle

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javascript - Check/Uncheck all the checkboxes in a table

javascript - Check/Uncheck all the checkboxes in a table

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