将数据推送到ko.observableArray

时间:2013-12-30 00:40:53

标签: c# javascript asp.net-mvc knockout.js signalr

我遇到了解决这个问题的问题。我在局部视图中有一个表单,我想从ko.observableArray填充一个select字段。在我的javascript中,我可以看到我的传入数据是通过signalR返回的,但由于某种原因,它没有被推送到我的observableArray。这是我的javascript:

var AddAthleteToRosterVm = function(user) {
var self = this;

// reference the auto-generated proxy for the hub
var teamMangHub = $.connection.teamMangHub;

// Athlete and Team arrays for select list
self.Athletes = ko.observableArray();
self.Teams = new Array();

// assign athlete data
teamMangHub.client.getAthletes = function(data) {
    // populate Athletes array
    self.Athletes.push(data); // data is not being pushed here.  Athletes array remains empty.
};

$.connection.hub.start().done(function() {

    // retrieve the athletes from the server
    teamMangHub.server.retrieveAthletes(user);

});
};

这是我的部分观点:

<h3 class="text-center">Add Athlete To Roster</h3>

@using (Html.BeginForm("AddAthleteToRoster", "CoachRosterManagement", FormMethod.Post,
new {@class = "text-center", id="athleteToRosterForm"}))
{
   @Html.AntiForgeryToken()

  <fieldset class="myFormSpace">
    <legend>Athlete Info</legend>

    <p>
        @Html.LabelFor(x => x.InputAthleteToRoster.AthleteId)<br />
        <select name="InputAthleteToRoster.AthleteId" data-bind="options: Athletes, optionsText: 'FirstName', value: 'Id', optionsCaption: 'Select'"></select>
    </p>
    <p>
        @Html.LabelFor(x => x.InputAthleteToRoster.CoachesTeamId)<br />
        @Html.DropDownListFor(x => x.InputAthleteToRoster.CoachesTeamId,
        new SelectList(Enumerable.Empty<SelectListItem>()), "Select")
    </p>
    <button type="submit">Add Athlete</button>
</fieldset>
}

这是从调用部分视图的视图应用绑定的脚本:

@section scripts
{

<script src="~/signalr/hubs"></script>
<script src="~/Scripts/MyScripts/AddAthleteToRoster.js"></script>
<script>
    var user = "@User.Identity.Name";


    ko.applyBindings(new AddAthleteToRosterVm(user));
</script>

}

另一方面,当我将Athlete数组从ko.observableArray更改为标准数组时,例如:

 self.Athletes = new Array();

然后数据将被推送,但它仍然不会在我的局部视图的选择字段中呈现。

1 个答案:

答案 0 :(得分:3)

data后,你的observableArray可能不是空的;为了检查它,你需要检查self.Athletes()的结果,因为observableArray is a function(所以self.Athletes本身将显示为一个空数组,即使其中有元素)。

假设data是一个对象数组,每个对象代表一名运动员,它可能无法正确绑定到您的选择列表,因为您将所有数据推送到一个数组元素中

self.Athletes.push(data);

由于数据本身就是一个数组,因此您需要添加data这样的元素:

self.Athletes.push.apply(self.Athletes, data);

(或者根据您的要求,可以简单地将其分配给self.Athletes(data)。)