如何在页面加载时将内部html的值转换为c＃代码

Question

Hi i have this code in java script i need the value of ip in the Code behind

 window.onload = function () {
        var script = document.createElement("script");
        script.type = "text/javascript";
        script.src = "http://www.telize.com/jsonip?callback=DisplayIP";
        document.getElementsByTagName("head")[0].appendChild(script);
    };
    function DisplayIP(response) {
        **document.getElementById("ipaddress").innerHTML = "Your IP Address is " + response.ip;**

    }

Answer 1

You can set hidden field in your JavaScript. Create a field in your ASP code:

<input type="hidden" id="ipHidden" runat="server" />

In your JavaScript add this:

    function DisplayIP(response) {
        document.getElementById("ipaddress").innerHTML = "Your IP Address is " + response.ip;
        document.getElementById("ipHidden").value = response.ip;
    }

In C#:

string clientIP = ipHidden.value;

Answer 2

you cannot get IP field on server side because the your java script will execute after your code behind finishes execution. you will be able to get it only when page finishes its rendering