How Do I Fetch Variable From C# In Javascript Function

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My variable is

C#

public string Coordinate5a;

inside if condition i am assigning value to Coordinate5a like this:

C#

if(res==ddlnetworkName)
 {
        Coordinate5a = alLatitude[2].ToString();
 }

The Following code is inside javascript

JavaScript

var c5a = '<%=Coordinate5a%>';

But output i am getting as ''(null) when i debug the code

Posted 14-Dec-15 21:54pm

mithun286

Updated 14-Dec-15 22:08pm

Suvendu Shekhar Giri

v2

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Comments

Kornfeld Eliyahu Peter 15-Dec-15 3:59am

Debug to see if you ever hit the line inside the if...

Suvendu Shekhar Giri 15-Dec-15 4:07am

hmm.. that makes sense !

mithun286 15-Dec-15 4:08am

Yes it is going inside the if and assigning value also but when i debug java script function the value is coming as '' (null)

Kornfeld Eliyahu Peter 15-Dec-15 4:11am

In that case it probably the timing - the inline expressions parsed during the rendering...You may set the value too late for that...

mithun286 15-Dec-15 4:12am

How to solve this???
what changes do i need to make?

Kornfeld Eliyahu Peter 15-Dec-15 4:15am

Move your initialization code (with that if) to before the rendering phase...

mithun286 15-Dec-15 4:20am

if i move initialization code inside page_load i am getting error in java script function ie,
variable does not exist in the current context

Kornfeld Eliyahu Peter 15-Dec-15 4:25am

In the early stage of page-loading there should be other elements missing...
Try to move your code to pre-rendering...
It would be also a good approach to update your question with more relevant code, so we can understand your flow and suggest fixes...

mithun286 15-Dec-15 4:30am

Kindly check the below code i have updated the relevant code:

public string Coordinate4a;
public string Coordinate4b;

public string Coordinate5a;

protected void Page_Load(object sender, EventArgs e)
{
if (res == ddlnetworkName)
{
Coordinate5a = alLatitude[2].ToString();
}
}
Inside page_load event i have set the value

for Fetching value inside java script following is the code

var c5a = '<%=Coordinate5a%>';

Suvendu Shekhar Giri 15-Dec-15 4:15am

In which C# event you have written the code to set value for Coordinate5a ?
Do you have a update panel placed in the page?

mithun286 15-Dec-15 4:38am

in page load event i have set the value for Coordinate5a

Suvendu Shekhar Giri 15-Dec-15 4:54am

You have written code to set Coordinate5a with alLatitude[2] and where have you written code to get data for alLatitude?

mithun286 15-Dec-15 4:59am

Though i hardcore the data of Coordinate5a like:
C# code
....
if (res == ddlnetworkName)
{
Coordinate5a = "c5a";
}
...

I am still getting its value as null in javascript function

Suvendu Shekhar Giri 15-Dec-15 5:06am

In which Javascript event you are trying to get value of this variable?

mithun286 15-Dec-15 5:11am

function keyStroke() {

var c5a = '<%=Coordinate5a%>';

}

This i am calling inside <body> like:

<dx:ASPxCheckBox ID="ASPxCheckBox4" Text="KeyStroke" ClientInstanceName="KeyStroke" runat="server">
<clientsideevents checkedchanged="function(s,e){ ShowLoadingPanel();strShowKeyStroke=s.GetChecked(); keyStroke();}">

on check box checked event i am calling keyStroke function()

Suvendu Shekhar Giri 15-Dec-15 5:21am

But isn't dx checkbox checked event is a server side event?
Can you share the code where exactly you are calling the keyStroke()?

mithun286 15-Dec-15 5:28am

please check below code in another comment i have added code.
Since i was not able to add code here.
please check and let me know and i have called client side event through dx checkbox

F-ES Sitecore 15-Dec-15 5:39am

If c5a is defined inside keystroke then it is only available in that function, any attempt to use c5a elsewhere will be "undefined".

The order code appears and is executed is vitally important so giving bits and pieces of code here and there without explaining how they flow together makes it hard for anything to give you a solution. Update your original question with all the relevant code so people can get an idea what is going on.

mithun286 15-Dec-15 5:43am

to the simplest way i asked question and explained every bit of code i added.
Don know whats wrong with you

F-ES Sitecore 15-Dec-15 5:54am

The code in your original question is of no use, the rest of the code is in pieces all over the comments and also of little use. If you learn how to ask proper questions you'll get better answers. What you're doing is incredibly basic so there is obviously something about your code you're not saying.

mithun286 15-Dec-15 5:55am

i have added the code in below comment in order and flow.
Kindly check it

mithun286 15-Dec-15 4:21am

Please check this code and let me know the changes

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mithun286 · Answer 1 · 2015-12-14T23:26:00

Solution 1

<dx:aspxcheckbox id="ASPxCheckBox4" text="KeyStroke" clientinstancename="KeyStroke" runat="server" xmlns:dx="#unknown">
                                                           <clientsideevents checkedchanged="function(s,e){ ShowLoadingPanel();strShowKeyStroke=s.GetChecked(); keyStroke();}" />
                                                       </dx:aspxcheckbox>

Posted 14-Dec-15 23:26pm

mithun286

Comments

mithun286 15-Dec-15 5:49am

Home.aspx

function keyStroke() {

var c5a = '<%=Coordinate5a%>';

}

This i am calling inside <body> like:

<dx:ASPxCheckBox ID="ASPxCheckBox4" Text="KeyStroke" ClientInstanceName="KeyStroke" runat="server">
<clientsideevents checkedchanged="function(s,e){ ShowLoadingPanel();strShowKeyStroke=s.GetChecked(); keyStroke();}">

Code Behind:
public string Coordinate5a;

protected void Page_Load(object sender, EventArgs e)
{
string ddlnetwork="cw";
if (ddlnetworkName== "CW")
{
Coordinate5a = "c5a";
}

}
<pre lang="c#">
<dx:ASPxCheckBox ID="ASPxCheckBox4" Text="KeyStroke" ClientInstanceName="KeyStroke" runat="server">
<clientsideevents checkedchanged="function(s,e){ ShowLoadingPanel();strShowKeyStroke=s.GetChecked(); keyStroke();}">

<pre lang="c#">

the value of Coordinate5a inside javascript i am getting as ''(null)