Is it necessary to register a client script again after a post-back event?

Is it necessary to re-register a client-script block on all post-backs if it is added on the first page load like this?

   if (this.Page.IsPostBack==false)
            {
                if (this.Page.ClientScript
                          .IsClientScriptIncludeRegistered("ctlmyControl")==false)
                {
                    string guidParamToHackBrowserCaching 
                                  = System.Guid.NewGuid().ToString();

this.Page.ClientScript.RegisterClientScriptInclude("ctlmyControl"
                         , ResolveUrl(String
                          .Format("~/clientScripts/ctlmyControl.js
                        ?par={0}",guidParamToHackBrowserCaching)));
                }
            }

Any insights or suggestions regarding this matter would be greatly appreciated.

javascriptasp.netpostbackregisterclientscriptblock

Answer №1

If the section of the webpage containing the script is refreshed after a postback, then it's necessary to re-register the script. If not, do not re-register it as it may cause duplication.

In the case of utilizing partial postbacks on a page with an UpdatePanel, refrain from re-registering scripts unless it is the initial page load. However, for full postbacks or when the page is first loaded, registering the script is essential. The ScriptManager will add scripts outside the dynamic content area of an UpdatePanel during partial postbacks, but it won't account for previously rendered scripts. (This may seem confusing, but that's just how it works.)

The bottom line is that scripts are not stored persistently, only remaining at the client side if that section of the page wasn't refreshed. Additionally, the ScriptManager doesn't track previously rendered scripts in the static part of the page. Therefore, if the area where the script is supposed to be placed gets updated during a postback (whether async or full), ensure to re-register the script; otherwise, don't.

Answer №2

It really depends on the purpose of the script, but most likely. When you refresh the page, the previous DOM elements and scripts are removed, and a new page instance is created. If you still require this script to be part of the page, then ensure that it is re-registered.

Another option is to modify the script to be more static so that the required control value can be passed as a parameter to a function. This way, you can simply use a standard <script tag, and all you need to do on each postback is store the control's id in a variable for calling the function.

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