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我目前正在使用 google feed api 来动态获取 feed 链接。我正在尝试使用 api 返回的结果为我的网站创建 rss 提要。现在问题是 api 函数调用仅在页面加载后发生，因此我无法访问页面加载函数中 api 返回的 url 值。

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
   <script type="text/javascript" src="https://www.google.com/jsapi?key=ABQIAAAAxII5vpTAk5gatTPIMAFoCxStIDvCAqMV0_KActMytIL1qEezxxQeBqRzIurcFfnrUgG2YMlC07VgbQ"></script>
    <script type="text/javascript">

        google.load("feeds", "1", { "callback": OnLoad });

        function OnLoad() {
            // Query for president feeds on cnn.com
            var query = 'atlanta bridal shows';
            google.feeds.findFeeds(query, findDone);
        }

        function findDone(result) {
            // Make sure we didn't get an error.
            if (!result.error) {
                // Get content div
                var content = document.getElementById('content');
                var html = '';
                var submenu = new Array()
                // Loop through the results and print out the title of the feed and link to
                // the url.
                for (var i = 0; i < result.entries.length; i++) {
                    var entry = result.entries[i];
                    html += '<p><a href="' + entry.url + '">' + entry.title + '</a></p>';
                    submenu[i] = entry.url;
                }
                content.innerHTML = html;

                document.getElementById('<%= Hidden1.ClientID %>').value = submenu;
            }
        }

        google.setOnLoadCallback(OnLoad);
    </script>

</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<asp:HiddenField ID="Hidden1" runat="server" ondatabinding="Hidden1_DataBinding" 
        onunload="Hidden1_Unload" onvaluechanged="Hidden1_ValueChanged" />
<div id="content"></div>

</asp:Content>

页面加载事件：

 protected void Page_Load(object sender, EventArgs e)
    {
        WebClient client = new WebClient();
        string path = Request.Url.GetLeftPart(UriPartial.Authority) +
               VirtualPathUtility.ToAbsolute("~/user/feed.htm");

        Stream stream = client.OpenRead(path);
        StreamReader sr = new StreamReader(stream);
        string content = sr.ReadToEnd();

          }

我应该怎么做才能访问 api 在页面加载中返回的值？

4

1 回答 1

1

首先，您必须创建feed.htm上面的代码并将其放入其中。

feed.htm（位于 web-app 的根目录）

<script type="text/javascript" src="https://www.google.com/jsapi?key=ABQIAAAAxII5vpTAk5gatTPIMAFoCxStIDvCAqMV0_KActMytIL1qEezxxQeBqRzIurcFfnrUgG2YMlC07VgbQ"></script>
<script type="text/javascript">

    google.load("feeds", "1", { "callback": OnLoad });

    function OnLoad() {
        // Query for president feeds on cnn.com
        var query = 'atlanta bridal shows';
        google.feeds.findFeeds(query, findDone);
    }

    function findDone(result) {
        // Make sure we didn't get an error.
        if (!result.error) {
            // Get content div
            var content = document.getElementById('content');
            var html = '';
            var submenu = new Array()
            // Loop through the results and print out the title of the feed and link to
            // the url.
            for (var i = 0; i < result.entries.length; i++) {
                var entry = result.entries[i];
                html += '<p><a href="' + entry.url + '">' + entry.title + '</a></p>';
                submenu[i] = entry.url;
            }
            content.innerHTML = html;

            document.getElementById('<%= Hidden1.ClientID %>').value = submenu;
        }
    }

    google.setOnLoadCallback(OnLoad);
</script>
<div id="content"></div>

然后在page_load发生 .aspx 页面后使用System.Net.WebClient类方法请求.aspx 页面feed.htm。

TestFeed.aspx（位于 web-app 的根目录）

标记：

<body>
    <form id="form1" runat="server">
    <div>
        <asp:Label ID="Label1" runat="server"></asp:Label>
    </div>
    </form>
</body>

代码隐藏：

protected void Page_Load(object sender, EventArgs e)
    {
        WebClient client = new WebClient();
        string path = Request.Url.GetLeftPart(UriPartial.Authority) + VirtualPathUtility.ToAbsolute("~/feed.htm");

        Stream stream = client.OpenRead(path);
        StreamReader sr = new StreamReader(stream);
        //To view the result
        Label1.Text = sr.ReadToEnd();
    }
于 2011-11-25T12:16:44.463 回答