在未解决主体时显示Polymer Paper微调器

Question

我希望在body标签设置了未解析的属性时显示聚合物纸张微调器。在页面完全加载之前，我会得到几秒钟的空白屏幕。

老实说，我不知道如何开始。

https://www.polymer-project.org/0.5/docs/elements/paper-spinner.html

Answer 1

通过jQuery将加载器添加到空白屏幕正文，并在收到回复后将其删除。

<INVOICES>
    <INVOICE>
        <INVOICE_NUMBER>FV2014000572</INVOICE_NUMBER>
        <SUPPLIER_NAME>Supplier 1</SUPPLIER_NAME>
        <INVOICE_ITEMS>
            <INVOICE_ITEM>
                <ITEM_INVOICE_NUMBER>FV2014000572</ITEM_INVOICE_NUMBER>
                <ITEM_NAME>ITEM 1</ITEM_NAME>
            </INVOICE_ITEM>
        </INVOICE_ITEMS>
    </INVOICE>
    <INVOICE>
        <INVOICE_NUMBER>FV2014000573</INVOICE_NUMBER>
        <SUPPLIER_NAME>Supplier 1</SUPPLIER_NAME>
        <INVOICE_ITEMS>
            <INVOICE_ITEM>
                <ITEM_INVOICE_NUMBER>FV2014000573</ITEM_INVOICE_NUMBER>
                <ITEM_NAME>ITEM 1</ITEM_NAME>
            </INVOICE_ITEM>
            <INVOICE_ITEM>
                <ITEM_INVOICE_NUMBER>FV2014000573</ITEM_INVOICE_NUMBER>
                <ITEM_NAME>ITEM 2</ITEM_NAME>
            </INVOICE_ITEM>
        </INVOICE_ITEMS>
    </INVOICE>
</INVOICES>

其中loader类将包含加载器。