C#代码与javaScript函数的相互调用
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C#代码与javaScript函数的相互调用
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问:
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1.如何在JavaScript访问C#函数?
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2.如何在JavaScript访问C#变量?
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3.如何在C#中访问JavaScript的已有变量?
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4.如何在C#中访问JavaScript函数?
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问题1答案如下:
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javaScript函数中执行C#代码中的函数:
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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;
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2、在前台写一个js函数,内容为document.getElementById("btn1").click();
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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;
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方法二:1、函数声明为public
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后台代码(把public改成protected也可以)
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public string ss()
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{
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return("a");
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}
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2、在html里用<%=fucntion()%>可以调用
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前台脚本
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<script language=javascript>
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var a = "<%=ss()%>";
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alert(a);
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</script>
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方法三:1、<script language="javascript">
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<!--
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function __doPostBack(eventTarget, eventArgument)
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{
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var theForm = document.Form1; //指runat=server的form
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theForm.__EVENTTARGET.value = eventTarget;
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theFrom.__EVENTARGUMENT.value = eventArgument;
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theForm.submit();
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}
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-->
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</script>
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<input id="Button1" type="button" name="Button1" value="按钮" onclick="javascript:__doPostBack('Button1','')">
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方法四:<script language="javascript">
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function SubmitKeyClick()
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{
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if (event.keyCode == 13)
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{
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event.cancelBubble = true;
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event.returnValue = false;
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document.all.FunName.value="你要调用的函数名";
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document.form[0].submit();
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}
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}
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</script>
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<INPUT onkeypress="SubmitKeyClick()" id="aaa" type="text">
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<input type="hidden" name="FunName"> 〈!--用来存储你要调用的函数 --〉
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在.CS里有:
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public Page_OnLoad()
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{
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if (!Page.IsPost())
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{
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string strFunName=Request.Form["FunName"]!=null?Request.Form["FunName"]:"";
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//根据传回来的值决定调用哪个函数
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switch(strFunName)
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{
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case "enter()":
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enter() ; //调用该函数
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break;
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case "其他":
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//调用其他函数
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break;
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default:
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//调用默认函数
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break;
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}
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}
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}
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public void enter()
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{
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//……比如计算某值
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}
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问题2.如何在JavaScript访问C#变量?
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答案如下:
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方法一:1、通过页面上隐藏域访问<input id="xx" type="hidden" runat="server">
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方法二:1、如后台定义了PUBLIC STRING N;前台js中引用该变量的格式为'<%=n%>'或"+<%=n%>+"
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方法三:1、或者你可以在服务器端变量赋值后在页面注册一段脚本
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"<script language='javascript'>var temp=" + tmp + "</script>"
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tmp是后台变量,然后js中可以直接访问temp获得值。
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3.如何在C#中访问JavaScript的已有变量?
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答案如下:
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方法一:1、前台使用静态文本控件隐藏域,将js变量值写入其中;
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2、后台用request["id"]来获取值;
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方法二:可以用cookie或session
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4.如何在C#中访问JavaScript函数?
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答案如下:
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c#代码中执行javaScript函数:
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方法一:1、Page.RegisterStartupScript("ggg","<script>SetVisible(1);</script>");
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方法二:使用Literal类,然后
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private void Button2_Click(object sender, System.EventArgs e)
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{
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string str;
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str="<script language='javascript'>";
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str+="selectRange()";
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str+="</script>";
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//Literal1.Visible=true;
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Literal1.Text=str;
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}
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