如何从CompositeView的子节点获取数据?

时间:2013-05-31 15:47:06

标签: backbone.js marionette

我有一个带有<header><tbody>的CompositeView。我需要添加到<tbody>的集合中的特定数据,以便在<header>中使用。具体来说,我需要显示集合中的记录总数以及所有模型的总成本(每个模型都有amount属性,其中包含美元值,如54.35)。

我该怎么做?

以下是所有相关代码:

/*
 * Layout
 */
var AppLayout = Backbone.Marionette.Layout.extend({
    template: "#customer-view",
    regions: {
        card: "#customer-card",
        quotes: "#customer-quotes",
        orders: "#customer-order-history"
    }
});
Show.Layout = new AppLayout();
Show.Layout.render();


/*
 * ItemView
 */
Show.HistoryItemView = Backbone.Marionette.ItemView.extend({
    tagName: "tr",
    template: "#customer-history-item"
});
Show.HistoryItemsView = Backbone.Marionette.CompositeView.extend({
    template: "#customer-history-wrapper",
    itemView: Show.HistoryItemView,
    itemViewContainer: "tbody"
});


/*
 * Items
 */
var customer_orders = Customers.request("customer:orders", UserID);
var customer_orders_view = new Show.HistoryItemsView({
    collection: customer_orders
});
Show.Layout.orders.show(customer_orders_view);

......还有模板:

<script type="text/template" id="customer-history-wrapper">
        <div class="module collapsible">
        <header>
            <hgroup>
                <h2>Order History</h2>
            </hgroup>
            <div class="results">
                <div class="left"><strong><%= NUMBER OF RECORDS %></strong> Orders</div>
                <div class="right">$ <%= TOTAL COST OF RECORDS %></div>
            </div>
        </header>
        <div class="module-content no-pad">
            <table class="simple-table six-up" cellpadding="0" cellspacing="0">
                <thead>
                    <tr>
                        <th>Date</th>
                        <th>Licensee</th>
                        <th>Company</th>
                        <th>Order</th>
                        <th class="numeric">Total</th>
                        <th class="cta">&nbsp;</th>
                    </tr>
                </thead>
                <tbody></tbody>
            </table>
        </div>
    </div>
</script>

<%= NUMBER OF RECORDS %><%= TOTAL COST OF RECORDS %>是我需要插入此数据的地方。

感谢我能得到的任何帮助!!

1 个答案:

答案 0 :(得分:1)

CompositeViews可以有一个集合和一个模型,用你需要的属性创建一个模型,在这种情况下,numberofRecors,totalCost, 然后在你的onBeforeRender函数上计算模型的总数,就像这样。

var customer_orders_view = new Show.HistoryItemsView({ 
    model: totals,
    collection: customer_orders
});
Show.Layout.orders.show(customer_orders_view);

Show.HistoryItemsView = Backbone.Marionette.CompositeView.extend({
template: "#customer-history-wrapper",
itemView: Show.HistoryItemView,
itemViewContainer: "tbody",
onBeforeRender : function () {
    this.model.set({numberOfRecors : this.collection.length});
    //here you can set the model values to be displayed.
}

});

你也可以通过预先计算的值传递模型,你不需要on before before函数,如果你在区域上调用show时这样做,这将调用compositeView的render函数,那将是它。你的模型也将在你的收藏中呈现。