Can anyone provide examples of how RegisterClientScriptBlock parameters are used in practical situations?

https://i.sstatic.net/dVjHt.jpg

I've always struggled to grasp the true purpose of using the Control, Type, and Key in this particular class.

Typically, I would use it with: this, GetType(), "xx"

however, now I am determined to gain a deeper understanding.

msdn :

Control: "the control that is registering the client script"

but why does it matter who registers it? The script will end up in the head of the page anyway....

Type: "the type of the client script block"

type? It's just javascript. Why do they require a different type from me?

Key: "a unique indentifier"

I see the use for this - especially for cases where later removal might be necessary... however, I crave more complex explanations.

Could someone provide a real life scenario where I absolutely have to manipulate these parameters?

c#javascript.netscriptmanagerregisterclientscriptblock

Answer №1

One crucial aspect to consider is Control, specifically which control in HTML tags you intend to target with your script. For instance, if you have a user control and wish to execute the script exclusively for that particular element, you can use the following line of code:

ScriptManager.RegisterStartupScript(this, this.GetType(), "alertscript", "document.getElementById('userControl_h1TAG')", true);

However, if your objective is to apply the script across all sections of the page, then insert this line in the CS code of the user-control:

ScriptManager.RegisterStartupScript(this.Page, this.Page.GetType(), "alertscript", "document.getElementById('page_h1TAG')", true);

Answer №2

When you use the method 

System.Web.UI.ScriptManager.RegisterClientScriptBlock
, it actually internally calls the method 
System.Web.UI.ScriptRegistrationManager.RegisterClientScriptBlock
. This method utilizes the parameter control to access 
System.Web.UI.ClientScriptManager.RegisterClientScriptBlock
through 
control.Page.ClientScript.RegisterClientScriptBlock
.

So, essentially, when you make a call like this:

MyScriptManager.RegisterClientScriptBlock(this, this.GetType(), "alertScript", "alert('hi')", true);

It's the same as calling:

this.Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "alertScript", "alert('hi')", true);

The type parameter proves useful when two different types attempt to register scripts using the same string keys.

Answer №3

Upon my research on MSDN, I came across a method that has slightly different parameters. However, I believe the insights provided in the answers will be more beneficial to you: (http://msdn.microsoft.com/en-us/library/bb350750.aspx) :

Control: Script blocks registered using this method are only sent to the page when the associated control is within an UpdatePanel control being updated.

Type: The type of the control registering the script is typically determined using the typeof operator (C#) or GetType operator (Visual Basic).

I suppose the key aspect here is ensuring one code block isn't included twice. Could it also provide a warning for reusing the same key?

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