使用Ajax时清除select2下拉列表的正确方法是什么？

我有一个select2的问题,在我输入一个项目后我想再次使用相同的下拉列表,我似乎无法删除以前选择的项目

例如,假设我的id是"#StreamName",我认为这会清除它:

 $("#StreamName").val(null).trigger("change");

但它似乎仍然显示以前选择的项目.从查看html看来,我通过这样做蛮力:

$("#select2-StreamName-container").html("");

但这似乎我没有正确使用API​​,所以我想看看是否有其他建议或我是否遗漏了一些东西.

看起来清除Select2的正确方法就是你的第一个建议,正如这个答案所暗示的那样.

使用Javascript

$(document).ready(function() {
  $("#StreamName").select2();
  $("#StreamName").val(null).trigger("change");
});

HTML

  Alabama
  California
  Wyoming

JSFiddle使用远程数据

即使使用远程数据源,这仍然可以清除Select2输入:

$("#StreamName").val(null).trigger("change");

完整的Javascript

$(document).ready(function() {
  $("#StreamName").select2({
    ajax: {
      url: "https://api.github.com/search/repositories",
      dataType: 'json',
      delay: 250,
      data: function(params) {
        return {
          q: params.term, // search term
          page: params.page
        };
      },
      processResults: function(data, params) {
        // parse the results into the format expected by Select2
        // since we are using custom formatting functions we do not need to
        // alter the remote JSON data, except to indicate that infinite
        // scrolling can be used
        params.page = params.page || 1;

        return {
          results: data.items,
          pagination: {
            more: (params.page * 30) < data.total_count
          }
        };
      },
      cache: true
    },
    escapeMarkup: function(markup) {
      return markup;
    }, // let our custom formatter work
    minimumInputLength: 1,
    templateResult: formatRepo, // omitted for brevity, see the source of this page
    templateSelection: formatRepoSelection // omitted for brevity, see the source of this page
  });


  $("#StreamName").val(null).trigger("change");

  // For testing...
  $('#set-null').click(function() {
    $("#StreamName").val(null).trigger("change");
  });



});


function formatRepo(repo) {
  if (repo.loading) return repo.text;

  var markup = "
" +
    "
" +
    "
" +
    "
" + repo.full_name + "
";

  if (repo.description) {
    markup += "
" + repo.description + "
";
  }

  markup += "
" +
    "
 " + repo.forks_count + " Forks
" +
    "
 " + repo.stargazers_count + " Stars
" +
    "
 " + repo.watchers_count + " Watchers
" +
    "
" +
    "
";

  return markup;
}

function formatRepoSelection(repo) {
  return repo.full_name || repo.text;
}

HTML

  select2/select2