Question

第1区： initialize方法按预期正常工作，但是当从 Block 3 * 调用“SelectIndustry”时，this.query未定义 *

ComplienceCollection = Backbone.Collection.extend({
model: Complience,

initialize: function () {

    _.bindAll(this, 'selectFeaturesCallback');
     vent.bind("onSelectIndustry", this.SelectIndustry);
    if(industrylookup == null)
    {
        industrylookup = "http://hostname/ArcGIS/rest/services/sss/MapServer/2?f=json";
    }
    this.queryTask = new esri.tasks.QueryTask(industrylookup);
    dojo.connect(this.queryTask, 'onComplete', this.selectFeaturesCallback);
    this.query = new esri.tasks.Query();
    this.query.returnGeometry = false;
    this.query.where = '1=1';
    this.query.outFields = ['*'];
    this.queryTask.execute(this.query);
    },
selectFeaturesCallback: function (featureSet) {
    var item=_.pluck(featureSet.features, "attributes");
    this.reset(item);
},
 SelectIndustry: function (oid) {


        this.query.where = '1=1';

      this.queryTask.execute(this.query);
}

}）;

第2块： 这是在页面加载时使用其他主干函数调用的

    vent = _.extend({}, Backbone.Events);
    complienceList = new ComplienceCollection();

第3区： 从普通的javascript文件调用

    vent.trigger("onSelectIndustry",indutrytype);

Answer 1

看起来javascript中this的具体情况可能因调用方法而异。而不是

vent.bind("onSelectIndustry", this.SelectIndustry);

试试这个：

var self = this;
vent.bind("onSelectIndustry", function( oid ){ self.SelectIndustry( oid ) });

如果这样可行，您可以通过$.proxy或类似内容来美化您的通话。

在Backbone中重置集合

1 个答案: