在select2中使用AJAX进行标记

Question

我正在用select2进行标记

我对select2有这些要求:

1. 我需要使用select2 ajax搜索一些标签
2. 另外我需要在select2中使用"tags",它允许不在列表中的值(Ajax结果).

这两个场景都是独立运作的 但加在一起的aJax值只是填充.如果我们输入不在列表中的任何其他值,则表示"找不到匹配项"

我的场景如果用户键入列表中没有的任何新值,请允许他们组成自己的标记.

有什么办法使这项工作？

Answer 1

Select2具有"createSearchChoice"功能:

从用户的搜索词创建一个新的可选择的选项.允许创建通过查询功能不可用的选项.当用户可以动态创建选项时很有用,例如用于"标记"用例.

您可以通过以下方式实现您的目标:

createSearchChoice:function(term, data) {
  if ($(data).filter(function() {
    return this.text.localeCompare(term)===0;
  }).length===0) {
    return {id:term, text:term};
  }
},
multiple: true

这是一个更完整的答案,它将JSON结果返回给ajax搜索,并允许从该术语创建标记,如果该术语返回没有结果:

$(".select2").select2({
  tags: true,
  tokenSeparators: [",", " "],
  createSearchChoice: function(term, data) {
    if ($(data).filter(function() {
      return this.text.localeCompare(term) === 0;
    }).length === 0) {
      return {
        id: term,
        text: term
      };
    }
  },
  multiple: true,
  ajax: {
    url: '/path/to/results.json',
    dataType: "json",
    data: function(term, page) {
      return {
        q: term
      };
    },
    results: function(data, page) {
      return {
        results: data
      };
    }
  }
});

Answer 2

选择v4

http://jsfiddle.net/8qL47c1x/2/

HTML:

<select multiple="multiple" class="form-control" id="tags" style="width: 400px;">
    <option value="tag1">tag1</option>
    <option value="tag2">tag2</option>
</select>

JavaScript的:

$('#tags').select2({
    tags: true,
    tokenSeparators: [','],
    ajax: {
        url: 'https://api.myjson.com/bins/444cr',
        dataType: 'json',
        processResults: function(data) {
          return {
            results: data
          }
        }
    },

    // Some nice improvements:

    // max tags is 3
    maximumSelectionLength: 3,

    // add "(new tag)" for new tags
    createTag: function (params) {
      var term = $.trim(params.term);

      if (term === '') {
        return null;
      }

      return {
        id: term,
        text: term + ' (new tag)'
      };
    },
});

选择v3.5.2

有一些改进的例子:

http://jsfiddle.net/X6V2s/66/

HTML:

<input type="hidden" id="tags" value="tag1,tag2" style="width: 400px;">

JS:

$('#tags').select2({
    tags: true,
    tokenSeparators: [','],
    createSearchChoice: function (term) {
        return {
            id: $.trim(term),
            text: $.trim(term) + ' (new tag)'
        };
    },
    ajax: {
        url: 'https://api.myjson.com/bins/444cr',
        dataType: 'json',
        data: function(term, page) {
            return {
                q: term
            };
        },
        results: function(data, page) {
            return {
                results: data
            };
        }
    },

    // Take default tags from the input value
    initSelection: function (element, callback) {
        var data = [];

        function splitVal(string, separator) {
            var val, i, l;
            if (string === null || string.length < 1) return [];
            val = string.split(separator);
            for (i = 0, l = val.length; i < l; i = i + 1) val[i] = $.trim(val[i]);
            return val;
        }

        $(splitVal(element.val(), ",")).each(function () {
            data.push({
                id: this,
                text: this
            });
        });

        callback(data);
    },

    // Some nice improvements:

    // max tags is 3
    maximumSelectionSize: 3,

    // override message for max tags
    formatSelectionTooBig: function (limit) {
        return "Max tags is only " + limit;
    }
});

JSON:

[
  {
    "id": "tag1",
    "text": "tag1"
  },
  {
    "id": "tag2",
    "text": "tag2"
  },
  {
    "id": "tag3",
    "text": "tag3"
  },
  {
    "id": "tag4",
    "text": "tag4"
  }
]

更新2015-01-22:

修复jsfiddle:http://jsfiddle.net/X6V2s/66/

更新2015-09-09:

使用Select2 v4.0.0 +它变得更容易.

选择v4.0.0

https://jsfiddle.net/59Lbxvyc/

HTML:

<select class="tags-select" multiple="multiple" style="width: 300px;">
  <option value="tag1" selected="selected">tag1</option>
  <option value="tag2" selected="selected">tag2</option>
</select>

JS:

$(".tags-select").select2({
  // enable tagging
  tags: true,

  // loading remote data
  // see https://select2.github.io/options.html#ajax
  ajax: {
    url: "https://api.myjson.com/bins/444cr",
    processResults: function (data, page) {
      return {
        results: data
      };
    }
  }
});

Answer 3

createSearchChoice : function (term) { return {id: term, text: term}; }

只需添加此选项