How to call javascript function from code-behind

Question

I wrote a javascript with a asp net page   In Asp net Page   lt HTML gt   lt HEAD gt        lt script type  text javascript  gt        function Myfunction              document getElementId  MyText   value  hi                  lt  script gt   lt  HEAD gt   lt BODY gt   lt input type  text  id  MyText  runat  server    gt   lt  BODY gt    In Code-behind   Private Sub Page Load ByVal sender As Object  ByVal e As System EventArgs    Handles Me Load        If Session  My     Hi  Then           I want to call  Myfunction  javascript function        End If   End Sub   How can I do

User · Accepted Answer

This is a way to invoke one or more JavaScript methods from the code behind. By using Script Manager we can call the methods in sequence. Consider the below code for example.

ScriptManager.RegisterStartupScript(this, typeof(Page), "UpdateMsg", 
    "$(document).ready(function(){EnableControls();
    alert('Overrides successfully Updated.');
    DisableControls();});", 
true);

In this first method EnableControls() is invoked. Next the alert will be displayed. Next the DisableControls() method will be invoked.

User · Answer

There is a very simple way in which you can do this  It involves injecting a javascript code to a label control from code behind  here is sample code    lt head runat  server  gt        lt title gt Calling javascript function from code behind example lt  title gt            lt script type  text javascript  gt               function showDialogue                      alert  this dialogue has been invoked through codebehind                              lt  script gt    lt  head gt                lblJavaScript Text     lt script type  text javascript  gt showDialogue    lt  script gt      Check out the full code here  http   softmate-technologies com javascript-from-CodeBehind htm  dead  Link from Internet Archive  https   web archive org web 20120608053720 http   softmate-technologies com javascript-from-CodeBehind htm

User · Answer

If the order of the execution is not important and you need both some javascript AND some codebehind to be fired on an asp element  heres what you can do   What you can take away from my example   I have a div covering the ASP control that I want both javascript and codebehind to be ran from  The div s onClick method AND the calendar s OnSelectionChanged event both get fired this way   In this example  i am using an ASP Calendar control  and im controlling it from both javascript and codebehind   Front end code             lt div onclick  showHideModal     gt               lt asp Calendar                  OnSelectionChanged  DatepickerDateChange  ID  DatepickerCalendar  runat  server                   BorderWidth  1px  DayNameFormat  Shortest  Font-Names  Verdana                   Font-Size  8pt  ShowGridLines  true  BackColor   B8C9E1  BorderColor   003E51  Width  100   gt                    lt OtherMonthDayStyle ForeColor   6C5D34  gt   lt  OtherMonthDayStyle gt                    lt DayHeaderStyle  ForeColor  black  BackColor   D19000  gt   lt  DayHeaderStyle gt                   lt TitleStyle BackColor   B8C9E1  ForeColor  Black  gt   lt  TitleStyle gt                    lt DayStyle BackColor  White  gt   lt  DayStyle gt                    lt SelectedDayStyle BackColor   003E51  Font-Bold  True  gt   lt  SelectedDayStyle gt                lt  asp Calendar gt           lt  div gt    Codebehind           protected void DatepickerDateChange object sender  EventArgs e                        if  toFromPicked Value     MainContent fromDate                                 fromDate Text   DatepickerCalendar SelectedDate ToShortDateString                              else                               toDate Text   DatepickerCalendar SelectedDate ToShortDateString

User · Answer

One way of doing it is to use the ClientScriptManager   Page ClientScript RegisterStartupScript      GetType          MyKey         Myfunction           true

[javascript] How to call javascript function from code-behind

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