Kendo UI [DropDownList]-多個元素沖突

Question

我正在將Kendo UI DropDownList元素與過濾器搜索一起使用。

如果用戶在下拉菜單中搜索而搜索到的項目不可用，則顯示+ Add鏈接...

僅當我有一個<select>框時，此方法才能按預期工作

感謝@Jonathan ，他在上述工作中提供了幫助：)

但是如果我有多個選擇框，則會出現問題

在線演示

jQuery的

$(document).ready(function() {
  // set up the delay function
  var delay = (function(){
    var timer = 0;
    return function(callback, ms) {
      clearTimeout (timer);
      timer = setTimeout(callback, ms);
    };
  })();

  $(".selectBox").kendoDropDownList({
    filter: "contains"
  });

  // set up the event handler
  $(".k-list-filter input").keyup(function () {

    // wait for Kendo to catch up
    delay(function () {
      // check the number of items in the list and make sure we don't already have an add link
      if ($('.k-list-scroller ul > li').length === 0 && !($(".newItem").length)) {
        $('.k-list-filter .k-i-search').hide();
        $('.k-list-filter').append('<a href="javascript:;" class="newItem">+ Add</a>');
      }

      // check the number of items in the list
      if ($('.k-list-scroller ul > li').length > 0) {
        $('.k-list-filter .k-i-search').show();
        $('.k-list-filter .newItem').remove();
      }

    }, 500); // 500 ms delay before running code
  });    
});

的HTML

<div class="row">
  <div class="col-xs-4">
    <div class="field">
      <select class="selectBox">
        <option>-- Select 1 --</option>
        <option>Lorem</option>
        <option>Ipsum</option>
        <option>Dolar</option>
      </select>
    </div>
  </div>
  <div class="col-xs-4">
    <div class="field">
      <select class="selectBox">
        <option>-- Select 2 --</option>
        <option>Lorem</option>
        <option>Ipsum</option>
        <option>Dolar</option>
        <option>Sit amet lieu</option>
      </select>
    </div>
  </div>
  <div class="col-xs-4">
    <div class="field">
      <select class="selectBox">
        <option>-- Select 3 --</option>
        <option>Lorem</option>
        <option>Ipsum</option>
        <option>Dolar</option>
      </select>
    </div>
  </div>
</div>

Answer 1

這是因為.k-list-scroller和.k-list-filter是為所有3個下拉列表呈現的，但是如果只需要為當前dropdownlist訪問這些元素，請在keyup事件中使用this關鍵字：

$(".k-list-filter input").keyup(function () {
    //"this" represents html input element
    var listFilter = $(this).closest('.k-list-filter');
    var listScroller = $(this).closest('.k-list-container').find('.k-list-scroller');
    // wait for Kendo to catch up
    delay(function () {
      // check the number of items in the list and make sure we don't already have an add link
        if (listScroller.find('ul > li').length === 0 && !listFilter.find(".newItem").length) {
            listFilter.find('.k-i-search').hide();
            listFilter.append('<a href="javascript:;" class="newItem">+ Add</a>');
        }
        // check the number of items in the list
        if (listScroller.find('ul > li').length > 0) {
            listFilter.find('.k-i-search').show();
            listFilter.find('.newItem').remove();
       }
    }, 500); // 500 ms delay before running code
}); 

Answer 2

有幾個原因導致您想要實現的目標沒有實現。 一切都與您在keyup函數中選擇項目的方式有關。 我將盡力解釋原因：

1. 您正在使用k-list-scroller選擇所有元素...共有3個。 所以這個表達的結果

   $('.k-list-scroller ul > li').length === 0

在給定的上下文中將始終為假

2. 同樣的事情在這里...

   $('.k-list-filter .ki-search').hide();

當您嘗試隱藏放大鏡圖標時

3. 最后但並非最不重要的一點是，當滿足上述條件時，您需要延遲內部代碼塊的執行，因為kendo / telerik會操縱下拉項並使之可見，換句話說，只要隱藏搜索圖標，telek就會顯示立即。

這是一個工作代碼段...

 $(document).ready(function() { // set up the delay function var delay = (function(){ var timer = 0; return function(callback, ms) { clearTimeout (timer); timer = setTimeout(callback, ms); }; })(); $(".selectBox").kendoDropDownList({ filter: "contains" }); // set up the event handler $(".k-list-filter input").keyup(function () { var self = this; // wait for Kendo to catch up delay(function () { // check the number of items in the list and make sure we don't already have an add link var itemsFound = $(self).parents('.k-list-container').find(".k-list-scroller ul > li").length; if (itemsFound === 0 && !($(".newItem").length)) { console.log("Adding new"); setTimeout(function(){ $(self).parents('.k-list-container').find('.k-list-filter .ki-search').hide(); $(self).parents('.k-list-container').find('.k-list-filter').append('<a href="javascript:;" class="newItem">+ Add</a>'); }, 50); } // check the number of items in the list if ($('.k-list-scroller ul > li').length > 0) { $('.k-list-filter .ki-search').show(); $('.k-list-filter .newItem').remove(); } }, 500); // 500 ms delay before running code }); }); 

 body{font-family:Verdana;font-size:12px;margin:50px 10px;} .k-header{border:1px solid #ccc;background:#fff;} .newItem{position:absolute;top:8px;right:10px;} 

 <link rel="stylesheet" type="text/css" href="//kendo.cdn.telerik.com/2016.1.112/styles/kendo.material.min.css"/> <link rel="stylesheet" type="text/css" href="//kendo.cdn.telerik.com/2016.1.112/styles/kendo.common-material.min.css"/> <link rel="stylesheet" type="text/css" href="//kendo.cdn.telerik.com/2016.1.112/styles/kendo.material.min.css"/> <link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css"/> <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script> <script type="text/javascript" src="//kendo.cdn.telerik.com/2016.1.112/js/kendo.all.min.js"></script> <script type="text/javascript" src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script> <div class="row"> <div class="col-xs-4"> <div class="field"> <select class="selectBox"> <option>-- Select 1 --</option> <option>Lorem</option> <option>Ipsum</option> <option>Dolar</option> </select> </div> </div> <div class="col-xs-4"> <div class="field"> <select class="selectBox"> <option>-- Select 2 --</option> <option>Lorem</option> <option>Ipsum</option> <option>Dolar</option> <option>Sit amet lieu</option> </select> </div> </div> <div class="col-xs-4"> <div class="field"> <select class="selectBox"> <option>-- Select 3 --</option> <option>Lorem</option> <option>Ipsum</option> <option>Dolar</option> </select> </div> </div> </div>