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.
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 resutOfExecuteJavaScript = 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.
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;
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