How to change value in array from asp.net to javascript

Question

I am loading the value of string myvalue (global string) in array arr in javascript by

function hello()
{
   alert("hi");
   var arr=[<% myvalue %>];
   alert(arr);
}

protected void ListBox1_SelectedIndexChanged(object sender, EventArgs e)
{
   myvalue="1234";
   Page.ClientScript.RegisterStartupScript(GetType(), "whatiskey", "hello();", true);  
}

and updating myvalue on listbox1.item select and calling method which updates value of arr, but javascript arr does not load the new value

Ehsan Sajjad · Accepted Answer · 2016-01-20 10:30:28Z

1

you have to put double quotes and write it like:

var arr=["<%=myvalue %>"];

or more better way :

var arr= new Array();
arr.push("<%=myvalue %>");

answered Jan 20, 2016 at 10:30

Ehsan Sajjad

62.6k16 gold badges112 silver badges171 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

phpnet Over a year ago

the problem is method is not being called , it is not showing any alert , how to solve it

Ehsan Sajjad Over a year ago

have a look on :stackoverflow.com/questions/4848678/…

Anil · Accepted Answer · 2016-01-20 10:46:14Z

0

Register ListBox1 as partial post back element could also be one of the reason.

are you able debug, that ListBox1_SelectedIndexChanged is being called.

You need to something like below to stop this from multiple time registered, this can one of the reason not to call hello(). Use F12 to investigate the rendered HTML.

// Check to see if the client script is already registered.
    if (!Page.ClientScript.IsClientScriptBlockRegistered(cstype, csname2))
    {
           Page.ClientScript.RegisterStartupScript(GetType(), "aNewKey",  "hello();", true);  
    }

edited Jan 20, 2016 at 10:46

answered Jan 20, 2016 at 10:30

Anil

3,7522 gold badges27 silver badges50 bronze badges

2 Comments

phpnet Over a year ago

The method hello() is not being executed , what is the problem here ?

Anil Over a year ago

is ListBox1_SelectedIndexChanged executed, are you sure?

Collectives™ on Stack Overflow

How to change value in array from asp.net to javascript

2 Answers 2

2 Comments

2 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

2 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related