Select2不知道所选值的相应文本

Question

我使用远程数据源作为选项.当我从服务器加载表单数据时,它只包含select元素的值.在这种情况下,select2不知道要向用户显示的相应文本.这种常见情况是否有内置的可重用机制？

使用ajax获取数据时如何设置当前选择的值/文本？

$('select#test').select2({
                    ajax: {
                        url: "user/combo",
                        dataType: 'json',
                        delay: 250,
                        cache: true
                    }
                });
            }
        }

实际上,我正在尝试创建一个角度指令,如下所示:

app.directive('mehrUserCombo', ['$http', function ($http) {
        return {
            link: function (scope, element, attr) {
                element.select2({
                    ajax: {
                        url: "user/combo",
                        dataType: 'json',
                        delay: 250,
                        cache: true
                    }
                });
            }
        }

Answer 1

这些是你的ajax选项:

ajax: {
  // The number of milliseconds to wait for the user to stop typing before
  // issuing the ajax request.
  delay: 250,
  // You can craft a custom url based on the parameters that are passed into the
  // request. This is useful if you are using a framework which has
  // JavaScript-based functions for generating the urls to make requests to.
  //
  // @param params The object containing the parameters used to generate the
  //   request.
  // @returns The url that the request should be made to.
  url: function(params) {
    return UrlGenerator.Random();
  },
  // You can pass custom data into the request based on the parameters used to
  // make the request. For `GET` requests, the default method, these are the
  // query parameters that are appended to the url. For `POST` requests, this
  // is the form data that will be passed into the request. For other requests,
  // the data returned from here should be customized based on what jQuery and
  // your server are expecting.
  //
  // @param params The object containing the parameters used to generate the
  //   request.
  // @returns Data to be directly passed into the request.
  data: function(params) {
    var queryParameters = {
      q: params.term
    }

    return queryParameters;
  },
  // You can modify the results that are returned from the server, allowing you
  // to make last-minute changes to the data, or find the correct part of the
  // response to pass to Select2. Keep in mind that results should be passed as
  // an array of objects.
  //
  // @param data The data as it is returned directly by jQuery.
  // @returns An object containing the results data as well as any required
  //   metadata that is used by plugins. The object should contain an array of
  //   data objects as the `results` key.
  processResults: function(data) {
    return {
      results: data
    };
  },
  // You can use a custom AJAX transport function if you do not want to use the
  // default one provided by jQuery.
  //
  // @param params The object containing the parameters used to generate the
  //   request.
  // @param success A callback function that takes `data`, the results from the
  //   request.
  // @param failure A callback function that indicates that the request could
  //   not be completed.
  // @returns An object that has an `abort` function that can be called to abort
  //   the request if needed.
  transport: function(params, success, failure) {
    var $request = $.ajax(params);

    $request.then(success);
    $request.fail(failure);

    return $request;
  }
}

关于processResult函数的用法:

 processResults: function(data) {
   $('select#test').select2("val", YOUR VALUE FROM PROCESSED DATA); //set the value
   return {
     results: data
   };
 }