为什么复选框在jquery中没有取消选中或点击事件没有激活？

Question

你能不能告诉我为什么在jquery或点击事件中没有取消选中复选框，而不是火？

我的演示中有一个复选框。用户可以取消选中此复选框，但我无法取消选中此复选框。这是我的代码

https://jsbin.com/lohaleleba/edit?html,css,js,output

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$(function() {
  function signUpAgreeCheckedEventHandler(e) {
    e.preventDefault();
    e.stopPropagation();
    alert('--')
  }
  $('#signUpAgree_js').click(signUpAgreeCheckedEventHandler)
})

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#toi-login .form ul li {
  list-style: none;
  margin-bottom: 22px;
}

#toi-login .checkbox {
  display: block;
  margin: 0 0 12px;
}

#toi-login p {
  font-size: 14px;
  line-height: 18px;
  color: #222;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

#toi-login .checkbox input[type="checkbox"] {
  display: none;
}

#toi-login input {
  display: block;
  width: 100%;
  line-height: normal;
  border: 0;
  font-size: 14px;
}

#toi-login .checkbox label:before {
  content: "";
  position: absolute;
  left: 0px;
  top: 2px;
  height: 14px;
  width: 14px;
  line-height: 15px;
  background: #ffffff no-repeat;
  -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -ms-transition: all 0.5s;
  -o-transition: all 0.5s;
  transition: all 0.5s;
  border: 1px solid #b1b1b1;
  border-radius: 2px;
}

#toi-login .checkbox input[type="checkbox"]:checked+label:before {
  background: #3696de;
  border-color: #3696de;
}

#toi-login .checkbox input[type="checkbox"]:checked+label:after {
  position: absolute;
  content: '';
  border: solid #fff;
  width: 5px;
  height: 10px;
  left: 4px;
  top: 3px;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

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<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="toi-login">
  <form class="form" action="#" autocomplete="off">
    <ul>
      <li class="checkbox">
        <p> <input type="checkbox" checked="true" id="signUpAgree_js"> <label for="agree">I agree with the                <a href="#"> Terms &amp; Conditions </a>and                <a href="#"> Privacy Policy</a> of Times of India</label> </p>
      </li>
    </ul>
  </form>
</div>

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请告诉我如何取消选中或切换此字段

Answer 1

只需更正标签for属性即可。 for属性确定与其关联的input，在这种情况下，需要提供signUpAgree_js的ID。

$(function() {
  function signUpAgreeCheckedEventHandler(e) {
    
    alert('--')
  }
  $('#signUpAgree_js').change(signUpAgreeCheckedEventHandler)
})

#toi-login .form ul li {
  list-style: none;
  margin-bottom: 22px;
}

#toi-login .checkbox {
  display: block;
  margin: 0 0 12px;
}

#toi-login p {
  font-size: 14px;
  line-height: 18px;
  color: #222;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

#toi-login .checkbox input[type="checkbox"] {
  display: none;
}

#toi-login input {
  display: block;
  width: 100%;
  line-height: normal;
  border: 0;
  font-size: 14px;
}

#toi-login .checkbox label:before {
  content: "";
  position: absolute;
  left: 0px;
  top: 2px;
  height: 14px;
  width: 14px;
  line-height: 15px;
  background: #ffffff no-repeat;
  -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -ms-transition: all 0.5s;
  -o-transition: all 0.5s;
  transition: all 0.5s;
  border: 1px solid #b1b1b1;
  border-radius: 2px;
}

#toi-login .checkbox input[type="checkbox"]:checked+label:before {
  background: #3696de;
  border-color: #3696de;
}

#toi-login .checkbox input[type="checkbox"]:checked+label:after {
  position: absolute;
  content: '';
  border: solid #fff;
  width: 5px;
  height: 10px;
  left: 4px;
  top: 3px;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="toi-login">
  <form class="form" action="#" autocomplete="off">
    <ul>
      <li class="checkbox">
        <p> <input type="checkbox" checked id="signUpAgree_js"> <label for="signUpAgree_js">I agree with the                <a href="#"> Terms &amp; Conditions </a>and                <a href="#"> Privacy Policy</a> of Times of India</label> </p>
      </li>
    </ul>
  </form>
</div>

Answer 2

您需要解决2个问题。

1. 标签for属性必须引用输入ID。在这种情况下，它应该是signUpAgree_js而不是agree。

   <label for="signUpAgree_js">
     I agree with the <a href="#"> Terms &amp; Conditions </a>
     and <a href="#"> Privacy Policy</a> of Times of India
   </label>
   

2. 必须是change事件，而不是click事件。

   $(function(){
     function signUpAgreeCheckedEventHandler(e) {
           e.preventDefault();
           e.stopPropagation();
           alert('--')
     }
     $('#signUpAgree_js').change(signUpAgreeCheckedEventHandler)
   })
   

Working Demo