how to write !Page.IsPostBack at javascript

Question

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i can do it at c# like this:

C#

protected void Page_Load(object sender, EventArgs e)
{
   if (!Page.IsPostBack)
   {
      //some script
   }
}

i have countries.js and need to call the function inside this file, the function is to list all the countries into <Select> drop down list.

normally i paste this under content place holder,

HTML

<script language="javascript">
print_country('ctl00_ContentPlaceHolder1_country', 'ctl00_ContentPlaceHolder1_state');
</script>

the script do functioning normally, but it always return selectedIndex as '0', so i wonder if I put the script under !Page.IsPostback ..

Posted 29-Dec-11 22:31pm

melvintcs

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3 solutions

Solution 2

Hi,
check following link,
hope your get the solution..
http://www.tedpavlic.com/post_detect_refresh_with_javascript.php[^]

Posted 29-Dec-11 23:09pm

Prasad_Kulkarni

Solution 3

C#

protected void Page_Load(object sender, EventArgs e)
{
   if (!Page.IsPostBack)
   {

string str="print_country('ctl00_ContentPlaceHolder1_country', 'ctl00_ContentPlaceHolder1_state');";
    Page.ClientScript.RegisterClientScriptBlock(this.getType(), '%^&$%', str,true);
  }
}

Posted 29-Dec-11 23:14pm

Sarvesh Kumar Gupta

Comments

melvintcs 30-Dec-11 5:35am

what is '%^&$%'? it's not working...

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saini arun · Accepted Answer · 2011-12-29T22:49:00

Solution 1

Remove the javascript code from content placeholder and register it inside !Page.IsPOstBack. This will make it to render only when page loads for the first time.

XML

protected void Page_Load(object sender, EventArgs e)
{
   if (!Page.IsPostBack)
   {

string jScript;
    jScript="<script>print_country('ctl00_ContentPlaceHolder1_country', 'ctl00_ContentPlaceHolder1_state');</script>";
    Page.RegisterClientScriptBlock("keyClientBlock",jScript);
  }
}

Posted 29-Dec-11 22:49pm

saini arun

Comments

melvintcs 30-Dec-11 5:49am

seems like it cant find my 'ctl00_ContentPlaceHolder1_country', any idea?
i double confirm, the ID is correct..

saini arun 30-Dec-11 6:20am

What do you mean by can't find the control? What error does it generate?
[You can use clientID to get the id of the control rendered on the page.]

protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{

string jScript;
jScript="<script>print_country('"+country.ClientID+"', '"+state.ClientID"');</script>";
Page.RegisterClientScriptBlock("keyClientBlock",jScript);
}
}

melvintcs 30-Dec-11 6:46am

error with " at ur code
i did this and it's still not working...
protected void Page_Load(object sender, EventArgs e)
{
string jScript;
jScript = "<script>document.getElementById('<%=Label1.ClientID%>').innerHTML = 'testing';</script>";
Page.RegisterClientScriptBlock("keyClientBlock", jScript);
}