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javascript - 使用 jQuery 切换 DOM 元素

转载 作者：行者123 更新时间：2023-12-03 11:11:48 26 4
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更新

我已使用 Igor's Answer 中的一些提示将类型集成到成员(member)注册中。并搜索 stackoverflow。它无法按预期工作，因为除了第一个成员类型 select 之外，其他成员类型 select 元素不会触发 registrationTypeChange 函数。因此，第一个成员的类型工作正常，而其他成员的类型没有按预期显示。

注意:第一个成员的选择在 Chrome 和 IE 中按预期工作，但在 Firefox 中不起作用

屏幕截图

member type year

member type period

正如您所看到的，当第二个成员的类型更改为“句点”时，相关元素不会显示，它应该与第一个成员类似，因为两者都是“句点”类型。我已经检查了用于查找 id 中的数字的正则表达式，它工作正常( Fiddle )。我猜想错误可能出在函数registrationTypeChange上。有人可以帮助我修复代码以使其在所有浏览器中按预期工作吗？

<强> Fiddle

HTML

<div class="row">
    <fieldset class="frame-border">
        <legend class="frame-border">Members Registration</legend>
        <div class="alert alert-warning alert-dismissible" role="alert" id="memberMinAlert">
            <button type="button" class="close" data-dismiss="alert"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span>

            </button>Minimum one member is required.</div>
        <div class="row">
            <div class="form-group-sm required">
                <label class="col-xs-2 col-md-2"></label>
                <label class="control-label col-xs-2 col-md-3">Name</label>
                <label class="control-label col-xs-2 col-md-2">Type</label>
            </div>
            <div class="form-group-sm">
                <label class="control-label col-xs-2 col-md-2">1st Parameter</label>
                <label class="control-label col-xs-2 col-md-2">2nd Parameter</label>
            </div>
            <div class="col-xs-2 col-md-1"> <span class="glyphicon glyphicon-plus-sign big" id="memberAdd" data-toggle="popover" data-placement="right" title="Click to add a member."></span>
 <span class="glyphicon glyphicon-minus-sign big" id="memberRemove" data-toggle="popover" data-placement="right" title="Click to remove a member."></span>

            </div>
        </div>
        <div class="member-template">
            <div class="row">
                <div class="form-group-sm required">
                    <label class="control-label col-xs-2 col-md-2" id="registrationMemberLabel">Member</label>
                    <div class="col-xs-2 col-md-3"> <span class="help glyphicon glyphicon-info-sign" data-toggle="popover" data-placement="right" title="Name of the member."></span> 
                        <input type="text" id="registrationMemberName" class="form-control" placeholder="Enter Name">
                    </div>
                    <div class="col-xs-2 col-md-2"> <span class="help glyphicon glyphicon-info-sign" data-toggle="popover" data-placement="right" title="Type of the membership."></span>

                        <select id="registrationMemberType" class="type-selector form-control">
                            <option value="yearly" selected="selected">Yearly</option>
                            <option value="period">Period</option>
                        </select>
                    </div>
                    <div class="col-xs-2 col-md-2"> <span class="help glyphicon glyphicon-info-sign" id="registrationMemberParam1Help" data-toggle="popover" data-placement="right" title="Help"></span>

                        <input type="number" id="registrationMemberParam1" name="registrationMemberParam1" class="form-control" min="2014" max="3000" step="1" placeholder="Name">
                    </div>
                    <div class="col-xs-2 col-md-2"> <span class="help glyphicon glyphicon-info-sign" id="registrationMemberParam2Help" data-toggle="popover" data-placement="right" title="Help"></span>

                        <input type="number" id="registrationMemberParam2" name="registrationMemberParam2" class="form-control" min="2015" max="3000" step="1 " placeholder="Name">
                    </div>
                </div>
            </div>
        </div>
        <div id="memberContainer"></div>
    </fieldset>
</div>

JavaScript

function registrationTypeChange(memberNum) {
    var theValue = $('#registrationMember' + memberNum + 'Type').find("option:selected").text();
    if (theValue === "Yearly") {
        $('#registrationMember' + memberNum + 'Param1Help').attr("title", "Please provide the year of membership");
        $('#registrationMember' + memberNum + 'Param1').attr("placeholder", "Year");
        $('#registrationMember' + memberNum + 'Param2').hide();
        $('#registrationMember' + memberNum + 'Param2Help').hide();
    } else if (theValue === "Period") {
        $('#registrationMember' + memberNum + 'Param1Help').attr("title", "Please provide the starting year of membership");
        $('#registrationMember' + memberNum + 'Param1').attr("placeholder", "From");
        $('#registrationMember' + memberNum + 'Param2Help').attr("title", "Please provide the ending year of membership");
        $('#registrationMember' + memberNum + 'Param2').attr("placeholder", "To");
        $('#registrationMember' + memberNum + 'Param2').show();
        $('#registrationMember' + memberNum + 'Param2Help').show();
    }
}

function addMember() {
    var memberNum = $('.member').length + 1;
    var $html = $('.member-template').clone();
    $html.find('[id=registrationMemberLabel]').html("Member" + memberNum);
    $html.find('[id=registrationMemberLabel]').attr("id", "registrationMember" + memberNum + "Label");
    $html.find('[id=registrationMemberName]').attr("id", "registrationMember" + memberNum + "Name");
    $html.find('[id=registrationMemberType]').attr("id", "registrationMember" + memberNum + "Type");
    $html.find('[id=registrationMemberParam1]').attr("id", "registrationMember" + memberNum + "Param1");
    $html.find('[id=registrationMemberParam1Help]').attr("id", "registrationMember" + memberNum + "Param1Help");
    $html.find('[id=registrationMemberParam2]').attr("id", "registrationMember" + memberNum + "Param2");
    $html.find('[id=registrationMemberParam2Help]').attr("id", "registrationMember" + memberNum + "Param2Help");
    return $html.html();
}

function removeMember() {
    var memberNum = $('.member').length;
    if (memberNum > 1) {
        document.getElementById("registrationMember" + memberNum).remove();
    } else {
        $("#memberMinAlert").alert();
        $("#memberMinAlert").fadeTo(2000, 500).slideUp(500, function () {
            $("#memberMinAlert").alert('close');
        });
    }
}

function addMemberHTML() {
    $('<div/>', {
        'class': 'member',
            'id': 'registrationMember' + ($('.member').length + 1),
        html: addMember()
    }).appendTo('#memberContainer');
    registrationTypeChange($('.member').length);
}

$(function () {
    addMemberHTML();
    registrationTypeChange(1);
    $("#memberMinAlert").hide();
    $('#memberAdd').click(function () {
        addMemberHTML();
    });
    $('#memberRemove').click(function () {
        removeMember();
    });
    $(".type-selector").change(function () {
        var re = /(?:\d+)/;
        var num = event.target.id.match(re);
        registrationTypeChange(num);
    });
});
<小时/>

我需要在动态元素集中动态管理表单元素。例如，我有一个成员(member)表单，它通过单击图标动态管理输入(添加、删除和更改属性)。(加号用于添加，减号用于删除)，它是基于 this 设计的。发布。

member registration

成员(member)注册中的类型选择通过更改选项动态管理一些元素(显示、隐藏和更改属性)。

member type

member type

HTML

<div class="row">
    <fieldset class="frame-border">
        <legend class="frame-border">Type</legend>
        <div class="row">
          <div class="form-group-sm required">              
            <label class="control-label col-xs-4 col-md-4">Type</label>
            <label class="col-xs-4 col-md-4">1st Parameter</label>
            <label class="col-xs-4 col-md-4">2nd Parameter</label>
          </div>
        </div>
          <div class="row">
          <div class="form-group-sm required">
      <div class="col-xs-4 col-md-4">
      <span class="help glyphicon glyphicon-info-sign" data-toggle="popover" data-placement="right" title="Type of Membership."></span>  
        <select id="registrationMemberTypeSample" class="form-control" >
          <option value="yearly" selected="selected">Yearly</option>
          <option value="period">Period</option>
        </select>
      </div>
      <div class="col-xs-4 col-md-4">
            <span class="help glyphicon glyphicon-info-sign" id="registrationMemberParam1Help" data-toggle="popover" data-placement="right" title="Help"></span>
            <input type="number" id="registrationMemberParam1" name="registrationMemberParam1" class="form-control" min="2014" max="3000" step="1" placeholder="Name">
          </div>
      <div class="col-xs-4 col-md-4">
            <span class="help glyphicon glyphicon-info-sign" id="registrationMemberParam2Help" data-toggle="popover" data-placement="right" title="Help"></span>
            <input type="number" id="registrationMemberParam2" name="registrationMemberParam2" class="form-control" min="2015" max="3000" step="1 "placeholder="Name">
      </div>
      </div>
      </div>
      </fieldset>
    </div>
    <div class="row">
      <fieldset class="frame-border">
        <legend class="frame-border">Members Registration</legend>
        <div class="alert alert-warning alert-dismissible" role="alert" id="memberMinAlert">
          <button type="button" class="close" data-dismiss="alert"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
          Minimum one member is required.
        </div>
        <div class="row">
          <div class="form-group-sm required">
            <label class="col-xs-3 col-md-3"> </label>                
            <label class="control-label col-xs-4 col-md-4">Name</label>
            <label class="control-label col-xs-3 col-md-3">Type</label>
          </div>
          <div class="col-xs-2 col-md-2">
            <span class="glyphicon glyphicon-plus-sign big" id="memberAdd" data-toggle="popover" data-placement="right" title="Click to add a member."></span>
            <span class="glyphicon glyphicon-minus-sign big" id="memberRemove" data-toggle="popover" data-placement="right" title="Click to remove a member."></span>
          </div>
        </div>
        <div class="member-template">
          <div class="row">
            <div class="form-group-sm required">
              <label class="control-label col-xs-3 col-md-3" id="registrationMemberLabel">Member</label>
              <div class="col-xs-4 col-md-4">
                <span class="help glyphicon glyphicon-info-sign" data-toggle="popover" data-placement="right" title="Name of the member."></span>                      
                <input type="text" id="registrationMemberName" class="form-control" placeholder="Enter Name"> 
              </div>
              <div class="col-xs-3 col-md-3">
              <span class="help glyphicon glyphicon-info-sign" data-toggle="popover" data-placement="right" title="Type of the membership."></span>
                <select id="registrationMemberType" class="form-control" >
                  <option value="yearly" selected="selected">Yearly</option>
                  <option value="period">Period</option>
                </select>
              </div>
            </div>
          </div>
        </div>
        <div id="memberContainer"></div>
      </fieldset>
    </div>

JavaScript

function registrationTypeChange() {
     var theValue = $("#registrationMemberTypeSample").find("option:selected").text();
     if(theValue === "Yearly" )
         {
         $('#registrationMemberParam1Help').attr("title","Please provide the year of membership");
         $('#registrationMemberParam1').attr("placeholder","Year");
         $('#registrationMemberParam2').hide();
         $('#registrationMemberParam2Label').hide();
         $('#registrationMemberParam2Help').hide();
         }
     else if(theValue === "Period" )
     {
     $('#registrationMemberParam1Help').attr("title","Please provide the starting year of membership");
     $('#registrationMemberParam1').attr("placeholder","From");
     $('#registrationMemberParam2Help').attr("title","Please provide the ending year of membership");
     $('#registrationMemberParam2').attr("placeholder","To");
     $('#registrationMemberParam2').show();
     $('#registrationMemberParam2Help').show();
     $('#registrationMemberParam2Label').show();
     }
}
function addMember() {
  var memberNum = $('.member').length+1;
  var $html = $('.member-template').clone();
  $html.find('[id=registrationMemberLabel]').html("Member" + memberNum);
  $html.find('[id=registrationMemberLabel]').attr("id", "registrationMember" + memberNum + "Label");
  $html.find('[id=registrationMemberName]').attr("id", "registrationMember" + memberNum + "Name");
  $html.find('[id=registrationMemberType]').attr("id", "registrationMember" + memberNum + "Type");
  return $html.html();
}

function removeMember() {
  var memberNum = $('.member').length;
   if(memberNum > 1 ) {
  document.getElementById("registrationMember" + memberNum).remove();
   }
   else {
       $("#memberMinAlert").alert();
       $("#memberMinAlert").fadeTo(2000, 500).slideUp(500, function(){
       $("#memberMinAlert").alert('close');
       });   
   }
}

function addMemberHTML(){
     $('<div/>', {
         'class' : 'member', 'id' :'registrationMember'+($('.member').length+1), html: addMember()
     }).appendTo('#memberContainer'); 
}

 $(function () {
     registrationTypeChange();
     addMemberHTML();
     $("#memberMinAlert").hide();
     $('#memberAdd').click(function () {
         addMemberHTML();   
    });
     $('#memberRemove').click(function () {
         removeMember();   
    });
     $("#registrationMemberTypeSample").change(function() {
            registrationTypeChange();
        });
     });

<强> JS Fiddle

现在我需要帮助将类型集成到所有成员行的成员注册中。我不知道要如何实现这一目标。谁能指导我如何做到这一点？

最佳答案

指南:

  1. registrationTypeChange()可以很好地管理某些字段。
  2. 在成员(member)注册中，您创建选择器为其分配特殊类别，例如。 <select class="type-selector" >

  3. 您依赖于该类 on() 方法，例如:

    ('.type_selector').on('change', function{... 做一些事情来更改其他输入})。

  4. 此函数内部 function{... do stuff to change other parameters }) this (或 $(this) )应引用用户现在更改的特定类型选择器(有关更多信息，请参阅文档)。所以你用 jquery 追踪它的 sibling / parent ，例如:$(this).siblings(<selector optional>)因此能够仅在该给定行中更改/添加其他参数设置。

随时询问是否有问题。不清楚。

更新

对于第 4 点:

您的模板:

 <div class="member-template">
      <div class="row">
        <div class="form-group-sm required">
          <label class="control-label col-xs-3 col-md-3" id="registrationMemberLabel">Member</label>
          <div class="col-xs-4 col-md-4">
            <span class="help glyphicon glyphicon-info-sign" data-toggle="popover" data-placement="right" title="Name of the member."></span>                      
            <input type="text" id="registrationMemberName" class="form-control" placeholder="Enter Name"> 
          </div>
          <div class="col-xs-3 col-md-3">
          <span class="help glyphicon glyphicon-info-sign" data-toggle="popover" data-placement="right" title="Type of the membership."></span>
            <select id="registrationMemberType" class="form-control" >
              <option value="yearly" selected="selected">Yearly</option>
              <option value="period">Period</option>
            </select>
          </div>
        </div>
      </div>
    </div>
  • $(this).parent('span')将保存选择元素的父范围( <span class="help glyphicon glyphicon-info-sign" data-toggle="popover" data-placement="right" title="Type of the membership."></span> )
  • $(this).parents('.row')将为所有家长带课row ，在我们的例子中，它是该行中的顶部父级；请参阅parents() of jquery
  • $(this).parents('.row').children('input')将举行input元素。请参阅children() of jquery 。顺便说一下，输入的 id 应该是唯一的，因为会有多个这样的行。
  • 有了这个输入，您就可以按照您想要的方式处理它(更改类型、克隆等)

我没有测试它，所以你做了一些小步骤，并使用 console.log() 或 console.dir() 选定的元素。

更新2

这里是您在类型选择器更改时调用registrationTypeChange()的地方:

$(".type-selector").change(function () {
    var re = /(?:\d+)/;
    var num = event.target.id.match(re);
    registrationTypeChange(num);
});

因为这些type selectors是动态的:

it doesn't work because it wasn't originally included in the page initialization.

因此，您需要通过jquery on()来铰接它们的功能方法:

Attach an event handler for all elements which match the current selector, now and in the future.

参见my answer's update section对于这种情况。

试试这个:

$(".type-selector").on('change', function () {
    var re = /(?:\d+)/;
    var num = event.target.id.match(re);
    registrationTypeChange(num);
});

更新3

从此answer它指出这 on方法需要一个选择器参数

otherwise the event is directly bound instead of delegated, which only works if the element already exists (so it doesn't work for dynamically loaded content)

所以绑定(bind)的代码应该是

JQuery(document).on('change', ".type-selector" ,function () {
    ...
});

关于javascript - 使用 jQuery 切换 DOM 元素，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/27551345/

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