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我正在使用select2 v4<select> ,其中我使用 ajax 方法将 select2 连接到一个元素。一切正常,除了我不能默认加载时选择的值。

示例页面说:

如果您需要提供默认选择,您只需为每个包含应显示的值和文本的选择包含一个选项。

在这段代码中,我想将值默认为“foo”:

标记:

<label class="input">
  <select aria-hidden="true" tabindex="-1" 
    class="form-control user-school-select select2-hidden-accessible" 
    name="user[school_id]" id="user_school_id">
    <option selected="selected" value="1">foo</option>
  </select>
  <span style="width: 372px;" dir="ltr" 
    class="select2 select2-container select2-container--default">
    <span class="selection">
      <span aria-labelledby="select2-user_school_id-container" 
        tabindex="0" class="select2-selection select2-selection--single" 
        role="combobox" aria-autocomplete="list" aria-haspopup="true" 
        aria-expanded="false">
          <span title="foo" id="select2-user_school_id-container" 
            class="select2-selection__rendered"></span>
          <span class="select2-selection__arrow" role="presentation">
            <b role="presentation"></b></span></span></span>
 <span class="dropdown-wrapper" aria-hidden="true"></span></span></span>
</label>

这个标记是由我的 rails 视图(users/edit.html.erb)生成的:

<%= label_tag nil, nil, :class => "input" do %>
  <% if @user.school_id %>
    <%= f.select :school_id, 
                 options_for_select({ @user.user_school => @user.school_id }, @user.school_id ), {}, 
                 { class: "form-control user-school-select" } %>
  <% else %>
    <%= f.select :school_id, {}, {},
                 {class: "form-control user-school-select"} %>
  <% end %>
<% end %>

users.js.erb 中的 javascript:

$(document).ready(function() {
  $(".user-school-select").select2({
    ajax: {
        url: "/schools",
        dataType: 'json',
        delay: 250,
        data: function (params) {
            return {
                q: params.term, // search term
                page: params.page
            };
        },
        processResults: function (data, page) {
            return {
                results: data
            };
        },
        cache: true
    },
    escapeMarkup: function (markup) { return markup; }, 
    minimumInputLength: 2,
    templateResult: formatSchool,
    templateSelection: formatSchoolSelection
  }); 
});  

function formatSchool (school) {
  var markup = '<div class="clearfix">' +
        '<div class="col-sm-1">' +
        (school.logo_url ? '<img src="' + school.logo_url + '" style="max-width: 100%" />' : "") +
        '</div>' +
        '<div class="col-sm-10">' +
        '<div class="clearfix">' +
        '<div class="col-sm-9">' + school.name + '</div>' +
        '</div>';
  markup += '</div></div>';
  return markup;
} 

function formatSchoolSelection (school) {
  return school.name;
}

我可以在 select2 生成的标记中看到 span 有一个title填充了我的值的属性,但实际的 span 文本为空:

<span class="selection">
  <span aria-labelledby="select2-user_school_id-container" tabindex="0" 
    class="select2-selection select2-selection--single" 
    role="combobox" aria-autocomplete="list" aria-haspopup="true" 
    aria-expanded="false">
    <span title="foo" id="select2-user_school_id-container" 
      class="select2-selection__rendered"></span>
    <span class="select2-selection__arrow" role="presentation">
      <b role="presentation"></b></span></span></span>

我还尝试了其他不推荐使用的方法initSelection,但无济于事:

$(".user-school-select").select2({
    ajax: {
        url: "/schools",
        dataType: 'json',
        delay: 250,
        data: function (params) {
            return {
                q: params.term, // search term
                page: params.page
            };
        },
        processResults: function (data, page) {
            return {
                results: data
            };
        },
        cache: true
    },
    escapeMarkup: function (markup) { return markup; }, // let our custom formatter work
    minimumInputLength: 2,
    templateResult: formatSchool,
    templateSelection: formatSchoolSelection,
    initSelection : function (element, callback) {
        var data = {"id":"1","text":'foo'};
        callback(data);
    }
});
$(".user-school-select").select2("data", {"id": 1, "text": "foo"});

我也尝试过添加这一行,但也无济于事:

$(".user-school-select").select2("val", "1");

我看过一堆类似问题的答案,但它们不适用于我的场景。我想是因为我使用的是select2 v4。我读过的大多数其他答案都说您要么需要initSelection结合使用val- 但那些其他示例总是使用<input>元素而不是<select>. 我在最新的文档中确实注意到了initSelection折旧,而是应该使用DataAdaptercurrent的方法,但我不知道如何将它应用到上面的代码中?

4

2 回答 2

2

不是正确的答案,但我不得不应用一种解决方法 - 通过删除templateSelection问题解决的方法。虽然不是一个好的解决方案,因为我想要 templateSelection 方法的好处。我暂时不用它。

$(document).ready(function() {
  $(".user-school-select").select2({
    ajax: {
        url: "/schools",
        dataType: 'json',
        delay: 250,
        data: function (params) {
            return {
                q: params.term, // search term
                page: params.page
            };
        },
        processResults: function (data, page) {
            return {
                results: data
            };
        },
        cache: true
    },
    escapeMarkup: function (markup) { return markup; }, 
    minimumInputLength: 2,
    templateResult: formatSchool/*,
    templateSelection: formatSchoolSelection*/
  }); 
}); 
于 2015-08-21T09:30:50.740 回答
0

设置如下值后change尝试触发:select2

$(".user-school-select").select2("val", "1").trigger('change');
于 2015-08-21T07:47:37.630 回答