Can t get ScriptManager RegisterStartupScript in WebControl nested in UpdatePanel to work

Question

I am having what I believe should be a fairly simple problem  but for the life of me I cannot see my problem  The problem is related to ScriptManager RegisterStartupScript  something I have used many times before   The scenario I have is that I have a custom web control that has been inserted into a page  The control  and one or two others  are nested inside an UpdatePanel  They are inserted onto the page onto a PlaceHolder    lt asp UpdatePanel ID  pnlAjax  runat  server  gt     lt ContentTemplate gt       lt asp PlaceHolder ID  placeholder  runat  server  gt       lt  asp PlaceHolder gt           protected override void OnInit EventArgs e     placeholder Controls Add Factory CreateControl       base OnInit e       This is the only update panel on the page   The control requires some initial javascript be run for it to work correctly  The control calls   ScriptManager RegisterStartupScript this  GetType                                         Guid NewGuid   ToString    script  true     and I have also tried   ScriptManager RegisterStartupScript Page  Page GetType                                         Guid NewGuid   ToString    script  true     The problem is that the script runs correctly when the page is first displayed  but does not re-run after a partial postback  I have tried the following    Calling RegisterStartupScript from CreateChildControls Calling RegisterStartupScript from OnLoad   OnPreRender Using different combinations of parameters for the first two parameters  in the example above the Control is Page and Type is GetType    but I have tried using the control itself  etc   I have tried using persistent and new ids  not that I believe this should have a major impact either way   I have used a few breakpoints and so have verified that the Register line is being called correctly    The only thing I have not tried is using the UpdatePanel itself as the Control and Type  as I do not believe the control should be aware of the update panel  and in any case there does not seem to be a good way of getting the update panel     Can anyone see what I might be doing wrong in the above   Thanks       Well  to answer the query above - it does appear as if the placeholder somehow messes up the ScriptManager RegisterStartupScript   When I pull the control out of the placeholder and code it directly onto the page the Register script works correctly  I am also using the control itself as a parameter      ScriptManager RegisterStartupScript this  GetType    Guid NewGuid   ToString    script  true      Can anyone throw any light on why an injected control onto a PlaceHolder would prevent the ScriptManager from correctly registering the script  I am guessing this might have something to do with the lifecycle of dynamic controls  but would appreciate  for my own knowledge  if there is a correct process for the above

User · Answer

I had an issue with Page ClientScript RegisterStartUpScript - I wasn t using an update panel  but the control was cached   This meant that I had to insert the script into a Literal  or could use a PlaceHolder  so when rendered from the cache the script is included   A similar solution might work for you

User · Answer

What worked for me  is registering it on the Page while specifying the type as that of the UpdatePanel  like so   ScriptManager RegisterClientScriptBlock this Page  typeof UpdatePanel  Guid NewGuid   ToString    myScript  true

User · Answer

When you call ScriptManager RegisterStartupScript  the  Control  parameter must be a control that is within an UpdatePanel that will be updated  You need to change it to   ScriptManager RegisterStartupScript this  this GetType    Guid NewGuid   ToString    script  true

User · Answer

Sometimes it doesnt fire when the script has some syntax error  make sure the script and javascript syntax is correct

User · Answer

ScriptManager RegisterStartupScript this  this GetType    Guid NewGuid   ToString   script   true      The  true  param value at the end of the ScriptManager RegisterStartupScript will add a JavaScript tag inside your page    lt script language  javascript  defer  defer  gt your script lt  script  gt    If the value will be  false  it will inject only the script witout the --script-- tag

User · Answer

I think you should indeed be using the Control overload of the RegisterStartupScript   I ve tried the following code in a server control    ToolboxData   lt  0  AlertControl runat server gt  lt   0  AlertControl gt     public class AlertControl   Control      protected override void OnInit EventArgs e           base OnInit e           string script    alert   Hello                ScriptManager RegisterStartupScript this  GetType                            ServerControlScript   script  true             Then in my page I have   protected override void OnInit EventArgs e       base OnInit e       Placeholder1 Controls Add new AlertControl         Where Placeholder1 is a placeholder in an update panel  The placeholder has a couple of other controls on in it  including buttons   This behaved exactly as you would expect  I got an alert saying  Hello  every time I loaded the page or caused the update panel to update   The other thing you could look at is to hook into some of the page lifecycle events that are fired during an update panel request   Sys WebForms PageRequestManager getInstance       add endRequest EndRequestHandler     The PageRequestManager endRequestHandler event fires every time an update panel completes its update - this would allow you to call a method to set up your control   My only other questions are    What is your script actually doing   Presumably you can see the script in the HTML at the bottom of the page  just before the closing  lt  form gt  tag   Have you tried putting a few  alert  Here     calls in your startup script to see if it s being called correctly   Have you tried Firefox and Firebug - is that reporting any script errors

User · Answer

The solution is to put the scripts in an outside js file  lets called  yourDynamic js   and re-register de file everytime you refresh the updatepanel   I use this in the updatepanel prerender event   ScriptManager RegisterClientScriptBlock UpdatePanel1  UpdatePanel1 GetType     UpdatePanel1 PreRender                          lt script type  text javascript  id  UpdatePanel1 PreRender  gt    amp                        include  yourDynamic js      amp                        removeDuplicatedScript  UpdatePanel1 PreRender    lt  script gt                          False    In the page or in some other include you will need this javascript      Include a javascript file inside another one  function include filename        var head   document getElementsByTagName  head   0        var scripts   document getElementsByTagName  script        for var x 0 x lt scripts length  gt               if  scripts x  getAttribute  src                          if scripts x  getAttribute  src   indexOf filename     -1                                head removeChild scripts x                    break                                     script   document createElement  script        script src   filename      script type    text javascript       head appendChild script        Removes duplicated scripts  function removeDuplicatedScript id        var count   0      var head   document getElementsByTagName  head   0        var scripts   document getElementsByTagName  script        var firstScript      for var x 0 x lt scripts length  gt               if  scripts x  getAttribute  id                          if scripts x  getAttribute  id   indexOf id     -1                                if  count    0                                        firstScript   scripts x                       count                                      else                                       head removeChild firstScript                       firstScript   scripts x                       count   1                                                      clearAjaxNetJunk         Evoids the update panel auto generated scripts to grow to inifity  X-  function clearAjaxNetJunk         var knowJunk    Sys Application add init function           var count   0      var head   document getElementsByTagName  head   0        var scripts   document getElementsByTagName  script        var firstScript      for var x 0 x lt scripts length  gt               if  scripts x  textContent                        if scripts x  textContent indexOf knowJunk     -1                                if  count    0                                        firstScript   scripts x                       count                                      else                                       head removeChild firstScript                       firstScript   scripts x                       count   1                                                      Pretty cool  ah   jejeje This part of what i posted some time ago here   Hope this help

User · Answer

I try many things and finally found that the last parameter must be false and you must add  lt SCRIPT gt  tag to the java script    string script     lt  SCRIPT  gt alert  hello     lt   SCRIPT gt     ScriptManager RegisterClientScriptBlock Page  Page GetType    key  script    false

User · Answer

DO NOT Use GUID For Key   ScriptManager RegisterClientScriptBlock this Page  typeof UpdatePanel          Guid NewGuid   ToString    myScript  true     and if you want to do that   call Something Like this function    public static string GetGuidClear string x           return x Replace  -       Replace  0       Replace  1                      Replace  2        Replace  3       Replace  4                      Replace  5       Replace  6       Replace  7                      Replace  8       Replace  9

User · Answer

I had an issue using this in a user control  in a page this worked fine   the Button1 is inside an updatepanel  and the scriptmanager is on the usercontrol   protected void Button1 Click object sender  EventArgs e            string scriptstring    alert  Welcome            ScriptManager RegisterStartupScript this  this GetType     alertscript   scriptstring  true         Now it seems you have to be careful with the first two arguments  they need to reference your page  not your control  ScriptManager RegisterStartupScript this Page  this Page GetType     alertscript   scriptstring  true

[c#] Can't get ScriptManager.RegisterStartupScript in WebControl nested in UpdatePanel to work

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