How to get session value in Javascript but my javascript code is in the code behind in asp.net. I am trying to set the variable value in javascript

Question

I am trying get the session value in javascript in my asp.net code behind. But the syntax is wrong I don't know how to get the session value. Here in my question i trying to set the value of sesindex variable which is a session value which i dont know how to set its totaly different

I tried to call javascript on page load normally its calling is fine. But when I am trying to set the variable value as session value its not calling alert box so their some where I put wrong but I don't know what it is.

Here is the code behind code:

str += "<script type='text/javascript'>" +
             //"alert('testing');" +
            "var sesindex = '<%=Session["indexval"]%>';" +
                "alert(sesindex);" +

                 "</script>";

I want to set sesindex value and show in alert box. I am trying to set the value but its not working. It is working fine in html page. But its not working in code behind.

Are you tried RegisterStartupScript/RegisterClientScriptBlock already? How you're inject the script into ASPX page? — Tetsuya Yamamoto
– Tetsuya Yamamoto, Commented Dec 21, 2018 at 5:32
Yes. When i comment the below two lines code its show the alert box testing but its not working the sesindex varible set code. I dont know that is it right or wrong — Manali
– Manali, Commented Dec 21, 2018 at 5:35
well, the ["indexval"] should have thrown an exception. This version will work on aspx side of things where '<%=Session["indexval"]%>' will be rendered to something. — amantur
– amantur, Commented Dec 21, 2018 at 5:38
Possible duplicate of how to pass session value from code behind to javascript — Tetsuya Yamamoto
– Tetsuya Yamamoto, Commented Dec 21, 2018 at 5:42
No its different from that question. Because their they directly pass session value which is normally doing in asp.net i.e. string str = session["set"].ToString(). Here i want to set a value in javascript and its not working as per your answer — Manali
– Manali, Commented Dec 21, 2018 at 6:07

amantur · Accepted Answer · 2018-12-21 06:14:38Z

0

Don't really like this but you can try this to get value into the string.

var sesVal = Session[indexval];

str += "<script type='text/javascript'>" +
        $"var sesindex = '{sesVal==null?"":sesVal.ToString()}'" +
            "alert(sesindex);" +"</script>";

This will get you covered when the value is null. You can read about $"{}" here.

edited Dec 21, 2018 at 6:14

answered Dec 21, 2018 at 5:36

amantur

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6 Comments

Manali Over a year ago

var sesVal = Session["indexval"]; Its not a proper way to set a value the cursor is not move after this line

amantur Over a year ago

Aha, sorry forgot to remove quotes around the variable name.

Manali Over a year ago

Thank u for your concern. But still its not working the cursor is not move after this line

Manali Over a year ago

Javascript not throwing any error when we write in code behind. I checked by debugger its directly break after var sesval = session["indexval"].ToString() line. Its not showing alert box

Manali Over a year ago

In aspx page we directly assign var session = '<%=Session["indexval"]%>' its gives proper result but in code behind how set var session as a session value

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