如何在jQuery中检测复选框点击

Question

我无法从下面的脚本中检测到何时以及哪个复选框被点击：

HTML 片段：

<label for="checkbox[1]"><input type="checkbox" name="checkbox[1]" id="checkbox[1]" class="detectThisChange" value="10.00" checked=""> Amount $10.00</label>
<label for="checkbox[2]"><input type="checkbox" name="checkbox[2]" id="checkbox[2]" class="detectThisChange" value="20.00" checked=""> Amount $20.00</label>
<label for="checkbox[3]"><input type="checkbox" name="checkbox[3]" id="checkbox[3]" class="detectThisChange" value="30.00" checked=""> Amount $30.00</label>

jQuery 片段：

$(document).ready(function() {
  $(window).load(function() {
// ... //
        $('.detectThisChange').change(function(event){
          var targetID = triggerEvent.target.id; // get the id that triggered the event
          var posStart = targetID.indexOf('[') + 1;
          var posEnd = targetID.indexOf(']');
          var i = targetID.substring(posStart, posEnd); // get the index of the id that triggered the event

          if ( $('#checkbox\\['+ i +'\\]').prop('checked') != true ) {
            alert('checkbox ' + i + ' was checked');
          }
          else {
            alert('checkbox ' + i + ' was unchecked');
          }

        });
// ... //
  }); // end .load()
}); // end .ready()

附加：

我遇到的问题是我的警报都不起作用。所以这告诉我 change() 函数没有触发。

Answer 1

如果您要动态添加此 HTML，则应使用 .on() 方法，例如：

$(document).on('change', '.detectThisChange', function() {
    // your code
});

试一试，如果有帮助，请告诉我。

Answer 2

这样试试

$("input[type=checkbox]").is(":checked") // returns boolean checked or unchecked

---

   var arr = [];
    $("input[type=checkbox]").each(function () {
        var self = $(this);
        if (self.is(':checked')) {
            arr.push(self.attr("id"));
        }
    });
    console.log(arr);

已编辑：

$("input[type=checkbox]").on('change', function () {
    var self = $(this);
    if (self.is(":checked")) {
        console.log("checkbox  id =" + self.attr("id") + "is checked ");
    } else {
        console.log("Id = " + self.attr("id") + "is Unchecked ");
    }
});

编辑 2：

$("body").on('change','.detectThisChange', function () {
    var self = $(this);
    if (self.is(":checked")) {
        console.log("checkbox  id =" + self.attr("id") + "is checked ");
    } else {
        console.log("Id = " + self.attr("id") + "is Unchecked ");
    }
});

Working Demo

Answer 3

尝试change 事件，将此id 选择器设为'input[id^=checkbox]'：

$(function() {
  $('input[id^=checkbox]').on('change', function() {
    console.log(this.value, this.checked);
  }).trigger('change');//fire event on page load
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<label for="checkbox[1]">
  <input type="checkbox" name="checkbox[1]" id="checkbox[1]" class="detectThisChange" value="10.00" checked="">Amount $10.00</label>
<label for="checkbox[2]">
  <input type="checkbox" name="checkbox[2]" id="checkbox[2]" class="detectThisChange" value="20.00" checked="">Amount $20.00</label>
<label for="checkbox[3]">
  <input type="checkbox" name="checkbox[3]" id="checkbox[3]" class="detectThisChange" value="30.00" checked="">Amount $30.00</label>

Answer 4

试试这个：

$(".detectThisChange").on('change', function () {

    alert("In the function");
    var targetID = this.id; // get the id that triggered the event
    var posStart = targetID.indexOf('[') + 1;
    var posEnd = targetID.indexOf(']');
    var i = targetID.substring(posStart, posEnd); // get the index of the id that triggered the event

    if ($('#checkbox\\[' + i + '\\]').prop('checked') == true) {
        alert('checkbox ' + i + ' was checked');
    } else {
        alert('checkbox ' + i + ' was unchecked');
    }
});

这里是 JSFiddle，即使你有答案 :)

Answer 5

试试:)

if ( $('#checkbox\\['+ i +'\\]').is(":checked") ) {
  alert('checkbox ' + i + ' was checked');
}
else {
  alert('checkbox ' + i + ' was unchecked');
}