How can I retrieve value from javascript function in codebehind, on page load .. javascript function like :

<script type="text/javascript">
        function isIFrame() {
            var isInIFrame = (top.location != self.location);
            if (isInIFrame) {
                return "inside";
            }
            else {
                return "outside";
            }
        }
    </script>

and code behind like :

protected void Page_Load(object sender, EventArgs e)
    {
        string resutOfExecuteJavaScript = "";
        // resutOfExecuteJavaScript = isIFrame(); // from javascript

        if (resutOfExecuteJavaScript == "inside")
        {
            // do something
        }
        else
        {
            // do something
        }
    }

thank you.

How can I retrieve value from javascript function in codebehind, on page load .. javascript function like :

<script type="text/javascript">
        function isIFrame() {
            var isInIFrame = (top.location != self.location);
            if (isInIFrame) {
                return "inside";
            }
            else {
                return "outside";
            }
        }
    </script>

and code behind like :

protected void Page_Load(object sender, EventArgs e)
    {
        string resutOfExecuteJavaScript = "";
        // resutOfExecuteJavaScript = isIFrame(); // from javascript

        if (resutOfExecuteJavaScript == "inside")
        {
            // do something
        }
        else
        {
            // do something
        }
    }

thank you.

• javascript
• c#
• asp
• code-behind

Share Improve this question Follow edited Jun 30, 2015 at 11:38 Uwe Allner 3,46799 gold badges3737 silver badges5151 bronze badges asked Jun 30, 2015 at 10:59 Mo7ammedMo7ammed 5111 gold badge33 silver badges99 bronze badges

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3 Answers 3

Sorted by: Reset to default 6

You cannot directly call a client side javascript method from server side code . For that first you need to assign the function result to value of some hidden variable and then access it in server side

Suppose you have an hidden field like this

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

then you can set the value as below

document.getElementById("hdnVal").value=isIFrame();

then at serve side

 string resutOfJavaScriptExecution = hdnVal.Value;

using _doPostBack, you can solve this one

      <script type="text/javascript">
             function isIFrame() {
            var isInIFrame =(top.location != self.location);
            var result;
            if (isInIFrame) { 
                result="inside";
             }
           else
             {
             result ="outside";
             }
           __doPostBack('callPostBack', result);
        </script>
    </head>

In code behind section

protected void Page_Load(object sender, EventArgs e)
{
    this.ClientScript.GetPostBackEventReference(this, "arg");
    if (IsPostBack)
    {
        string eventTarget = this.Request["__EVENTTARGET"];
        string eventArgument = this.Request["__EVENTARGUMENT"];

        if (eventTarget != String.Empty && eventTarget == "callPostBack")
        {
            if (eventArgument == "inside"){   
               //do something
               }
           else if(eventArgument == "outside")
            {
           //do something
           }
       }
    else
    {
       // set the button click
        btnclick.Attributes.Add("onClick", "isIFrame();");
    }
}

Below link will help you out to get more idea.

http://www.dotnetcurry./ShowArticle.aspx?ID=203

in javascript file or your script add :

function SetHiddenVariable()
     {
        document.getElementById(inpHide).value= "value";
     }

in .aspx add this tag:

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

in aspx.cs (c# file) add :

 anyVariable = inpHide.Value;