Behavior: focusonevent

Recently, I have been troubled by various things and my blog has not been updated. Today I will share a simple technique.

When loading a page, you need to focus on a textbox. This is easy to implement in codebehind. If mvvm mode is used, this is irrelevant to viewmodel, but it can be implemented using behavior.

Targetedtriggeraction <t> is used here. This T must be a control, because focus can be used in this way:

 
Public ClassFocusonevent: targetedtriggeraction <control>
 

{
 

Protected Override VoidInvoke (ObjectO)
 

{
 

 
Htmlpage. plugin. Focus ();
 

Target. Focus ();
 

 
}
 

}
 

We can add a defaulttrigger for it to trigger in the loaded event.

[Defaulttrigger (Typeof(Frameworkelement ),Typeof(Eventtrigger ),"Loaded")]
 

Now that behavior is defined, reference this behavior on the UI.

<I: interaction. triggers>
 

<I: eventtrigger>
 

<Local: focusonevent Targetname= "Textbox1"/>
 

</I: eventtrigger>
 

</I: interaction. triggers>
 

In this way, after the page is loaded successfully, textbox1 will be set as the default focus control.

This article is here to help you.