jQuery 可拖放 - 如果可放置区域包含 li 元素，则隐藏占位符

Question

我正在使用 jQuery Droppable 插件。

如果 Dropped <ul> 有一个或多个元素，我想隐藏一个占位符。它适用于拖放功能。最重要的是，我还实现了点击方法。它还将通过单击拖动容器中的星形图标来克隆 <li> 元素。但是在这个方法中，我无法隐藏占位符。

---

FIDDLE

请检查下面的代码:::

HTML

<div class="mn-items">
  <h2>Drag</h2>
  <div id="catalog">
      <ul class="rp-draggable">
        <li class="one">Item 1 <i class="fa fa-star-o"></i></li>
        <li class="two">Item 2 <i class="fa fa-star-o"></i></li>
        <li class="three">Item 3 <i class="fa fa-star-o"></i></li>
        <li class="four">Item 4 <i class="fa fa-star-o"></i></li>
        <li class="five">Item 5 <i class="fa fa-star-o"></i></li>
        <li class="six">Item 6 <i class="fa fa-star-o"></i></li>
      </ul>
  </div>
</div>

<div class="header-favorites">
  <h2>Drop Here...</h2>
    <ul class="h-droped-list">
      <li class="placeholder">Placeholder (hides if it has items)</li>
    </ul>
</div>

jQuery

$(document).ready(function(){

    /* jQuery Droppable */
    $(function() {
        $( ".mn-items .rp-draggable li" ).draggable({
            appendTo: "body",
            helper: "clone"
        });
        $( ".header-favorites ul" ).droppable({
            activeClass: "ui-state-default",
            hoverClass: "ui-state-hover",
            accept: ":not(.ui-sortable-helper)",
            drop: function( event, ui ) {
                $( this ).find( ".placeholder" ).remove();
                $(ui.draggable).clone().appendTo(this);
            }
        }).sortable({
            items: "li:not(.placeholder)",
            sort: function() {
                $( this ).removeClass( "ui-state-default" );
            }
        });
    });


    /* Click Star Icon to Add to Drop Here Container */
    $('ul.rp-draggable li .fa-star-o').click(function(){
        $(this).closest('li').clone().appendTo('.h-droped-list');
        $(this).closest('li').toggleClass('addedToFav');
    });

    /* Click Close Icon to Remove from Drop Here Container */
    $("ul.h-droped-list").on('click','li .fa-star-o',function(){
        $(this).closest('li').remove();
    });

    /* Hide Placeholder if it has Items, Show if it is empty */
    if($(".header-favorites ul li:not(.placeholder)").length > 0) {
        $(".header-favorites ul li.placeholder").hide();
    }else{
        $(".header-favorites ul li.placeholder").show();
    }


});

Answer 1

我给你一个link到Fiddle。我做了一些可能对您有帮助的更新，但您还有一些工作要做。如果你需要的话，我稍后会帮助你。

js

$(document).ready(function(){

/* jQuery Droppable */
$(function() {
    $( ".mn-items .rp-draggable li" ).draggable({
        appendTo: "body",
        helper: "clone"
    });
    $( ".header-favorites ul" ).droppable({
        activeClass: "ui-state-default",
        hoverClass: "ui-state-hover",
        accept: ":not(.ui-sortable-helper)",
        drop: function( event, ui ) {
            $( this ).find( ".placeholder" ).hide();
            $(ui.draggable).clone().appendTo(this);
        }
    }).sortable({
        items: "li:not(.placeholder)",
        sort: function() {
            $( this ).removeClass( "ui-state-default" );
        }
    });
});


/* Click Star Icon to Add to Drop Here Container */
$('ul.rp-draggable li .fa-star-o').click(function(){
    var $target = $(this).closest("li"),
        $dropedList = $(".h-droped-list");

    if(!$target.hasClass("addedToFav")){
        $target
          .addClass("addedToFav")
          .clone()
          .appendTo($dropedList);

        $dropedList
         .find(".placeholder")
         .hide();
    }else{
        //do what you want
    }

});

/* Click Close Icon to Remove from Drop Here Container */
$("ul.h-droped-list").on('click','li .fa-star-o',function(){
    var $target = $(this).closest("li"),
        $dropList = $target.parent("ul");

    $target.remove();



    if($dropList.children().length == 1){
        var $lastItem = $($dropList.children()[0]);
        $lastItem.hasClass("placeholder") && $lastItem.show();
    }

});

/* Hide Placeholder if it has Items or Show if it is empty */
if($(".header-favorites ul li:not(.placeholder)").length > 0) {
    $(".header-favorites ul li.placeholder").hide();
}else{
    $(".header-favorites ul li.placeholder").show();
}

});