javascript函数中执行C#代码中的函数:
方法一:1、首先建立一个按钮,在后台将调用或处理的内容写入button_click中;
2、在前台写一个js函数,内容为document.getElementById("btn1").click();
3、在前台或后台调用js函数,激发click事件,等于访问后台c#函数;
方法二:1、函数声明为public
后台代码(把public改成protected也可以)
public string ss()
{
return("a");
}
2、在html里用<%=fucntion()%>可以调用
前台脚本
<script language=javascript>
var a = "<%=ss()%>";
alert(a);
</script>
方法三:1、<script language="javascript">
<!- -
function __doPostBack(eventTarget, eventArgument)
{
var theForm = document.Form1; //指runat=server的form
theForm.__EVENTTARGET.value = eventTarget;
theFrom.__EVENTARGUMENT.value = eventArgument;
theForm.submit();
}
-->
</script>
<input id="Button1" type="button" name="Button1" value="按钮" onclick="javascript:__doPostBack('Button1','')">
方法四:<script language="javascript">
function SubmitKeyClick()
{
if (event.keyCode == 13)
{
event.cancelBubble = true;
event.returnValue = false;
document.all.FunName.value="你要调用的函数名";
document.form[0].submit();
}
}
</script>
<INPUT onkeypress="SubmitKeyClick()" id="aaa" type="text">
<input type="hidden" name="FunName"> 〈!--用来存储你要调用的函数 --〉
在.CS里有:
public Page_OnLoad()
{
if (!Page.IsPost())
{
string strFunName=Request.Form["FunName"]!=null?Request.Form["FunName"]:"";
//根据传回来的值决定调用哪个函数
switch(strFunName)
{
case "enter()":
enter() ; //调用该函数
break;
case "其他":
//调用其他函数
break;
default:
//调用默认函数
break;
}
}
}
public void enter()
{
//……比如计算某值
}
方法五 直接用XHtmlRequest, client callback, javascript访问Web Service或WebMethod.
以访问WebMethod为例:
1、ScriptManager的EnablePageMethod必须为true.
HTML code
<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="true">
<Scripts>
<asp:ScriptReference Path="~/Scripts/MyScript.js" />
</Scripts>
</asp:ScriptManager>
2、服务器方法必须是static方法
C# code
[System.Web.Services.WebMethod]
public static string[] GetStringArray(string s, int cnt)
{
string[] stringArray = new string[cnt];
Random rnd = new Random();
for (int i = 0; i < cnt; i++)
{
stringArray[i] = string.Format("Random{0}: {1}-{2}",i, s, rnd.Next(cnt));
}
//throw new Exception("亲爱的错误");
System.Threading.Thread.Sleep(3000);
return stringArray;
}
3、可以把script代码放到.js文件里,如Scripts目录下的MyScript.js内。
JScript code
function CallWebMethod(prefix,count)
{
$get('result').innerText = "请稍侯...";
PageMethods.GetStringArray(prefix, count, OnSuccess, OnFailed);
return false;
}
function OnSuccess(stringArray)
{
var s = "";
for(var i = 0; i < stringArray.length; i++)
{
s += stringArray[i] + "\n";
}
$get('result').innerText = s;
}
function OnFailed(error, userContext, methodName)
{
if(error != null)
{
alert("发生了亲爱的错误:" + error.get_message());
}
}
//.aspx
HTML code
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="true">
<Scripts>
<asp:ScriptReference Path="~/Scripts/MyScript.js" />
</Scripts>
</asp:ScriptManager>
<div>
<asp:Label ID="LabelPrefix" AssociatedControlID="TextBoxPrefix" runat="server" Text="string prefix: "></asp:Label>
<asp:TextBox ID="TextBoxPrefix" runat="server"></asp:TextBox>
<asp:Label ID="LabelCnt" AssociatedControlID="TextBoxCnt" runat="server" Text="count: "></asp:Label>
<asp:TextBox ID="TextBoxCnt" runat="server"></asp:TextBox>
<cc1:FilteredTextBoxExtender
ID="FilteredTextBoxExtenderCnt" runat="server"
TargetControlID="TextBoxCnt"
ValidChars="1234567890"
>
</cc1:FilteredTextBoxExtender>
<input id="Button1" type="button" value="button" TextBoxPrefix.ClientID %>').value,$get('<%= TextBoxCnt.ClientID %>').value)" />
</div>
<div id="result" style="border:solid 1px Maroon; margin: 10px; padding;5px;">
</div>
</form>