ASP.net MVC and querySelectorAll.forEach

Question

What is the meaning of this line onsubmit = "this.querySelectorAll('button').forEach(i => i.disabled = false)",

using (Html.BeginForm("Login", "Default", new { ReturnUrl = ViewBag.ReturnUrl }, FormMethod.Post,  
new  
{  
	id = "idMyForm",  
	onsubmit = "this.querySelectorAll('button').forEach(i => i.disabled = false)",  
	@class = "form-signin",  
	role = "form"  
}))  
{  
  
}  

Thanks

Answer 1

On the rendered form element, JavaScript is declared for the onsubmit attribute. This JavaScript finds all button elements that are a child of the form and disables them. Probably to prevent clicking a second time during the form post. Another common approach is is modal that displays a message.