jQuery自动完成给出TypeError:this._renderItem(...)未定义 [英] jQuery autocomplete gives TypeError: this._renderItem(...) is undefined

问题描述

我当前在页面的三个位置使用.data( "ui-autocomplete" )._renderItem = function( ul, item ).现在，我需要再添加一个.

I'm currently using .data( "ui-autocomplete" )._renderItem = function( ul, item ) in three places in my page. Now I need to add one more and I'm done.

但是这次我收到错误消息

But this time I get the error message

TypeError:this._renderItem(...)未定义

TypeError: this._renderItem(...) is undefined

奇怪的是，只有当我的IF测试为假时，我才能得到这个.

The strange thing is that I only get this if my IF test is false.

 .data( "ui-autocomplete" )._renderItem = function( ul, item ) {

  // If only one row is returned and ID = 0, then return 'no result' message
  if(item.id == '0') {
    return jQuery( "<li></li>" )
        .data( "item.autocomplete", item )
        .append( "<div class='no-result'>"+ item.value + "</div>" )
        .appendTo( ul );
  }

我不知道为什么它在这里失败了，而不是在其他3个地方都失败了.哪里有冲突?

I can't figure out why it's failing here, and not in the other 3 places. Is there a conflict somewhere?

这是我的代码

jQuery('#my-selector').autocomplete({
  minLength: 2,
  source: function( request, response ) {
    jQuery.ajax({
        url: callback_url,
        dataType: "json",
        data: {
                term: request.term
        },
        success: function( data ) {
          response( jQuery.map( data, function( item ) {
            return {
              id: item.id,
              value: item.name,
              name_encoded: item.name_encoded
            }
        }));
      }
    });
  },
  select: function( event, ui ) {
        return false;
  }
}).data( "ui-autocomplete" )._renderItem = function( ul, item ) {
  if(item.id == '0') {
    return jQuery( "<li></li>" )
        .data( "item.autocomplete", item )
        .append( "<div class='no-result'>"+ item.value + "</div>" )
        .appendTo( ul );
  }
};

更新

此更改有效.但是我仍然不明白为什么当我不在其他两个autocomplete函数中使用它时为什么必须在这里使用else语句.

This change works. But I still don't understand why I must use a else statement here, when I'm not using it in two other autocomplete functions.

.data( "ui-autocomplete" )._renderItemData = function( ul, item ) {
        if(item.id == '0') {
                return jQuery( "<li></li>" )
                        .data( "item.autocomplete", item )
                        .append( "<div class='no-result'>"+ item.value + "</div>" )
                        .appendTo( ul );
        } else {
            return this._renderItem( ul, item ).data( "ui-autocomplete-item", item );
        }

};

从搜索条件为some的查询中返回数据

Return data from query with search term some

[
  {"id":"8186","name":"Some Are Thieves"},
  {"id":"6149","name":"Somet"},
  {"id":"6150","name":"Somethin'Else from SKECHERS"}
]

推荐答案

这是因为测试，如果测试失败，则_renderItem不会返回与返回undefined等效的任何值.

It is because of the test, if the test fails then _renderItem does not return any value which is equivalent to returning undefined.

但是按如下所示调用_renderItem，这会导致错误，因为jquery尝试将数据值设置为返回值.

But _renderItem is called as given below, which causes the error since jquery attempts to set the data value to the returned value.

return this._renderItem( ul, item ).data( "ui-autocomplete-item", item );

在您的情况下，您必须覆盖_renderItemData而不是_renderItem

In your case you have to, override _renderItemData instead of _renderItem

var el = $('<my-autocomplete-element>');
var _renderItemData = el.data("ui-autocomplete")._renderItemData;
el.data("ui-autocomplete")._renderItemData = function(ul, item) {

    // If only one row is returned and ID = 0, then return 'no result' message
    if (item.id == '0') {
        return jQuery("<li></li>").data("item.autocomplete", item).data(
                "ui-autocomplete-item", item).append("<div class='no-result'>"
                + item.value + "</div>").appendTo(ul);
    } else {
        _renderItemData.apply(this, arguments)
    }
}

演示:柱塞

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