javascript - 选中/取消选中所有复选框仅选中 1 个复选框，但返回所有其他复选框值

Question

我有这个 javascript，它会检查所有复选框并取消选中所有复选框。 如果我单击此复选框，它将向 input=text 发送一个值。这个复选框/取消选中复选框的问题是，当我单击它时，它将返回所有值(这正是我想要的，但问题是它只会勾选 1 个复选框，但返回所有值。)我希望它勾选所有值返回所有值的复选框。

下面是代码。

function addValue(row) {
  //select all checkboxes with name userid that are checked
  var checkboxes = document.querySelectorAll("input[name='user_id[]']:checked")

  var values = "";

  //append values of each checkbox into a variable (seperated by commas)
  for (var i = 0; i < checkboxes.length; i++) {
    values += checkboxes[i]
      .value + ","
  }

  //remove last comma
  values = values.slice(0, values.length - 1)

  //set the value of input box
  document.getElementById("studID").value = values;

}
//Above is the code to return value to the input=text.

//Below is the code for check/uncheck all checkbox value

function CheckUncheckAll() {
  var selectAllCheckbox = document.getElementById("checkUncheckAll");
  if (selectAllCheckbox.checked == true) {
    var checkboxes = document.getElementsByName("user_id[]");
    for (var i = 0, n = checkboxes.length; i < n; i++) {
      checkboxes[i].checked = true;

      var values = "";

      //append values of each checkbox into a variable (seperated by commas)
      for (var i = 0; i < checkboxes.length; i++) {
        values += checkboxes[i]
          .value + ","
      }

      //remove last comma
      values = values.slice(0, values.length - 1)

      //set the value of input box

    }
  } else {
    var checkboxes = document.getElementsByName("user_id[]");
    for (var i = 0, n = checkboxes.length; i < n; i++) {
      checkboxes[i].checked = false;
      var values = "";

      for (var i = 0; i < checkboxes.length; i++) {
        values += ""
      }
    }
  }
  document.getElementById("studID").value = values;

}

<table>
  <tr onclick="addValue(this);">
    <input type="checkbox" id="checkUncheckAll" onClick="CheckUncheckAll()" />Check all<br/></th>
    <td><input type="checkbox" name="user_id[]" value='1' /></td>
    <td><input type="checkbox" name="user_id[]" value='2' /></td>
    <td><input type="checkbox" name="user_id[]" value='3' /></td>
  </tr>
</table>

<input class="form-control" name="user_id" id="studID" type="text" maxlength="255" />

Answer 1

以下是如何检查所有并收集

function sumIt(checkboxes) {
  var values = [];
  checkboxes.forEach(function(box) {
    if (box.checked) values.push(box.value)
  })
  document.getElementById("studID").value = values.join(",");
}

window.addEventListener("load", function() {
  var checkboxes = document.getElementsByName("user_id[]");

  document.getElementById("checkUncheckAll").addEventListener("click", function() {
    var checked = this.checked;
    checkboxes.forEach(function(box) {
      box.checked = checked;
    })
    sumIt(checkboxes)
  })


  checkboxes.forEach(function(box) {
    box.addEventListener("click", function() {
      sumIt(checkboxes)
    })
  })
})

<table>
  <tr>
    <th colspan="3"><input type="checkbox" id="checkUncheckAll" />Check all</th>
  </tr>
  <tr>
    <td><input type="checkbox" name="user_id[]" value='1' /></td>
    <td><input type="checkbox" name="user_id[]" value='2' /></td>
    <td><input type="checkbox" name="user_id[]" value='3' /></td>
  </tr>
</table>

<input class="form-control" name="user_id" id="studID" type="text" maxlength="255" />