如何从方法内部调用javascript函数？

I am inside of...

我在里面......

public class bgchange : IMapServerDropDownBoxAction
{
    void IServerAction.ServerAction(ToolbarItemInfo info)
    {
     Some code...

and after "some code" I want to trigger

并且在“一些代码”之后我想触发

[WebMethod]
public static void DoSome()
{

}

Which triggers some javascript. Is this possible?

哪个触发了一些javascript。这可能吗?

Ok, switch methods here. I was able to call dosome(); which fired but did not trigger the javascript. I have tried to use the registerstartupscript method but don't fully understand how to implement it. Here's what I tried:

好的,在这里切换方法。我能够调用dosome();哪个被解雇但没有触发javascript。我曾尝试使用registerstartupscript方法,但不完全了解如何实现它。这是我尝试过的:

public class bgchange : IMapServerDropDownBoxAction
{

void IServerAction.ServerAction(ToolbarItemInfo info)
{
    ...my C# code to perform on dropdown selection...
        //now I want to trigger some javascript...
        // Define the name and type of the client scripts on the page.
        String csname1 = "PopupScript";
        Type cstype = this.GetType();

        // Get a ClientScriptManager reference from the Page class.
        ClientScriptManager cs = Page.ClientScript;

        // Check to see if the startup script is already registered.
        if (!cs.IsStartupScriptRegistered(cstype, csname1))
        {
            String cstext1 = "alert('Hello World');";
            cs.RegisterStartupScript(cstype, csname1, cstext1, true);
        }
}

}

I got the registerstartupscript code from an msdn example. Clearly I am not implementing it correctly. Currently vs says "An object reference is required for the non-static field, method, or property 'System.Web.UI.Page.ClientScript.get' refering to the piece of code "Page.Clientscript;" Thanks.

我从msdn示例中获取了registerstartupscript代码。显然我没有正确实现它。目前vs说“非静态字段,方法或属性'System.Web.UI.Page.ClientScript.get'需要一个对象引用,引用一段代码”Page.Clientscript;“谢谢。

4 个解决方案

#1

I'm not sure I fully understand the sequence of what you are trying to do, what's client-side and what's not....

我不确定我是否完全理解你要做什么的顺序,什么是客户端,什么不是......

However, you could add a Start-up javascript method to the page which would then call the WebMethod. When calling a WebMethod via javascript, you can add a call-back function, which would then be called when the WebMethod returns.

但是,您可以向页面添加一个启动javascript方法,然后调用WebMethod。通过javascript调用WebMethod时,可以添加一个回调函数,然后在WebMethod返回时调用该函数。

If you add a ScriptManager tag on your page, you can call WebMethods defined in the page via Javascript.

如果在页面上添加ScriptManager标记,则可以通过Javascript调用页面中定义的WebMethods。

<asp:ScriptManager ID="scriptManager1" 
    runat="server" EnablePageMethods="true" />

From the Page_Load function you can add a call to your WebMethod..

从Page_Load函数中,您可以添加对WebMethod的调用。

Page.ClientScript.RegisterStartupScript(
    this.GetType(), 
    "callDoSome",
    "PageMethods.DoSome(Callback_Function, null)", 
    true);

Callback_Function represents a javascript function that will be executed after the WebMethod is called...

Callback_Function表示将在调用WebMethod后执行的javascript函数...

<script language="javascript" type="text/javascript">
    function Callback_Function(result, context) {
        alert('WebMethod was called');
    }
</script>

EDIT:

Found this link for Web ADF controls. Is this what you are using??

找到此链接用于Web ADF控件。这是你正在使用的??

From that page, it looks like something like this will do a javascript callback.

从该页面看起来像这样的东西会做一个javascript回调。

public void ServerAction(ToolbarItemInfo info) {
    string jsfunction = "alert('Hello');";
    Map mapctrl = (Map)info.BuddyControls[0];
    CallbackResult cr = new CallbackResult(null, null, "javascript", jsfunction);
    mapctrl.CallbackResults.Add(cr);
}

#2

If the above is how you are calling RegisterStartupScript, it won't work because you don't have a reference to the "Page" object.

如果您正在调用RegisterStartupScript,则它将无法工作,因为您没有对“Page”对象的引用。

bgchange in your example extends Object (assuming IMapServerDropDownBoxAction is an interface), which means that there is no Page instance for you to reference.

您的示例中的bgchange扩展了Object(假设IMapServerDropDownBoxAction是一个接口),这意味着您没有可供引用的Page实例。

This you did the exact same thing from a Asp.Net Page or UserControl, it would work, because Page would be a valid reference.

你从Asp.Net页面或UserControl做了完全相同的事情,它会工作,因为Page将是一个有效的参考。

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Page.ClientScript.RegisterStartupScript(
            this.GetType(),
            "helloworldpopup",
            "alert('hello world');",
            true);          
    }
}

#3

You cannot call methods within a browser directly from the server. You can, however, add javascript functions to the response that will execute methods within the browser.

您无法直接从服务器调用浏览器中的方法。但是,您可以将javascript函数添加到将在浏览器中执行方法的响应中。

Within the ServerAction method, do the following

在ServerAction方法中,执行以下操作

string script = "<script language='javascript'>\n";
script += "javascriptFunctionHere();\n";
script += "</script>";

Page.RegisterStartupScript("ForceClientToCallServerMethod", script);

More info here

更多信息在这里

#4

hmmm... the question changed dramatically since my original answer.

嗯......自从我的原始答案以来,问题发生了巨大的变化。

Now I think the answer is no. But I might be wrong.

现在我认为答案是否定的。但我可能错了。

#1