How to store an array in session and retrive it with javascript

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Hi,
In my c# code, I store an array in session. Below is the c# code

C#

protected void loadDuties()
       {
           MyClass M = new MyClass();
           string[] duties = null;
           duties = M.get_Duties();
           Session["duties"]= duties;
           //return duties;
       }

And on my master page, I want to retrieve this array.

XML

<script>
    function load() {
         var duties = new Array();
        duties = '<%=Session["duties"].ToString()%>';
        alert(duties.toString());
        for (i = 0; i < duties.length; i++)
            {
            document.getElementById(duties[i]).style.display = "block";
            }
                   }
                   window.onload = load;
   </script>

But the alert prints System.String[]
Please help

Posted 30-Jul-15 23:37pm

Member 10820603

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Comments

F-ES Sitecore 31-Jul-15 6:10am

Your .net code isn't running inside the browser, your js can't access server objects. The .net code generates static html which is sent to the browser to use. When you write Session["duties"].ToString then you get the type name written to the html which is why you're seeing System.String[] in the source.

Render the array as json rather than ToString and you can then use the duties variable like a json object as the source will then contain your array as json mark-up.

var duties = <%= yourArrayAsJSON %>

Google "asp.net serialise object to json" and you'll find examples.

2 solutions

Solution 1

Hi,

First of all reaching session objects from hidden inputs is a more prefable way. But for this purpose you have to convert your array into a JSON object. You can do it with Javascript Serializer[^]

To do it place a hidden object into your page:

<input runat="server" type="hidden" name="myhidden" id="myhidden" />

Afterwards set your session value into it as well from the codebehind,

myhidden.Value = "YOUR DUTIES";

Then it's easy to reach this hidden input from javascript.

alert(document.form1.myhidden.value)

Posted 31-Jul-15 0:44am

SercanOzdemir

Updated 31-Jul-15 0:47am

v2

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sasanka sekhar panda · Accepted Answer · 2015-07-31T00:55:00

Solution 2

First Serialize then use ....

XML

    var dataArray = <%=new System.Web.Script.Serialization.JavaScriptSerializer().Serialize(Session["duties"])%>

    alert(dataArray[1]);
</script>

Posted 31-Jul-15 0:55am

sasanka sekhar panda

Updated 31-Jul-15 0:57am

v3

Comments

Member 10820603 31-Jul-15 19:26pm

Thanks so much. It worked perfectly.