在php中提交或页面刷新后如何保持复选框的选中状态？答案

【问题标题】：How to keep checked state of checkbox after submit or page refresh in php?在php中提交或页面刷新后如何保持复选框的选中状态？
【发布时间】：2018-11-05 11:31:30
【问题描述】：

我想在页面刷新或提交后保持复选框的选中状态。在我的代码中，复选框在显示提交结果后位于下拉按钮内，但不保持选中状态。

这是我的 html 代码。

HTML：

    <form method="GET" name="frm1" action="filter.php" id="form">
    <div class="dropdown" id="myDropdown">
        <button type="button"  class="btn mr-2 mt-1 fillbtn" style="background-color:#494f4d; color: white; float:right; font-size:11px;" data-toggle="dropdown">
        <i class="fa fa-filter" aria-hidden="true"></i>&nbsp;&nbsp;MOVIES
    </button>
    <div class="dropdown-menu dropdown-menu-right ml-4" style="background-color:black; width:100%; height:90%;">

        <div class="row rounded rowtv" style="background-color:black; color:#d2d8d6;">
            <h4 class="mb-3 mt-3 border-bottom" style=" margin:auto; color:#76ff03; font-family:bold;">Movies</h4>
        </div>


        <div class="row rounded rowtv" style="background-color:black; color:#d2d8d6;">


        <div class="col-12 col-sm-6 col-md-6 col-lg-3 tvgen">

        <h4>Genre</h4>

        <div  class="" style="display:inline-block; margin-left:15px;" >
        <label class="custom-control custom-checkbox">
        <input type="checkbox" class="custom-control-input ids"  name="search[]" value="action">
        <span class="custom-control-indicator"></span>
        <span class="custom-control-description" >Action</span>
        </label><br>

        <label class="custom-control custom-checkbox">
        <input type="checkbox" class="custom-control-input ids"  name="search[]" value="adventure">
        <span class="custom-control-indicator"></span>
        <span class="custom-control-description">Adventure</span>
        </label><br> 

        <label class="custom-control custom-checkbox">
        <input type="checkbox" class="custom-control-input ids" name="search[]" value="animation">
        <span class="custom-control-indicator"></span>
        <span class="custom-control-description">Animation</span>
        </label><br> 

        <label class="custom-control custom-checkbox">
        <input type="checkbox" class="custom-control-input ids" name="search[]" value="biography">
        <span class="custom-control-indicator"></span>
        <span class="custom-control-description">Biography</span>
        </label><br>

        </div> 

        </div> 

    </div>

    </form>

【问题讨论】：

标签： javascript php html bootstrap-4

【解决方案1】：

以下代码使用 javascript 和 cookie 来保持复选框在提交或页面刷新时的状态。

Javascript：

<script>
  document.addEventListener("DOMContentLoaded", function(event) {
    var chks = document.querySelectorAll('input[name="search[]"]');

    for (var i = 0; i < chks.length; i++) {
      if (getCookie('search[' + chks[i].value + ']') == 'true') {
        chks[i].checked = true;
      }
    }

    for (var i = 0; i < chks.length; i++) {
      chks[i].addEventListener('click', function() {
        document.cookie = "search[" + this.value + "]=" + this.checked + "; expires=Thu, 18 Dec 2018 12:00:00 UTC; path=/";
      });

    }

    function getCookie(cname) {
      var name = cname + "=";
      var decodedCookie = decodeURIComponent(document.cookie);
      var ca = decodedCookie.split(';');
      for (var i = 0; i < ca.length; i++) {
        var c = ca[i];
        while (c.charAt(0) == ' ') {
          c = c.substring(1);
        }
        if (c.indexOf(name) == 0) {
          return c.substring(name.length, c.length);
        }
      }
      return "";
    }
  });
</script>

【讨论】：