Today in this blog we will discuss the ‘action’ attribute for Visual Page tag. Sometimes there might be a scenario where the Visualforce page needs to be rendered based on some calculation or condition for e.g. Display Product Inquiry screen if it is a new customer or displays recent Product revisions to existing customers. Salesforce provides a way to define logic before rendering a visualforce page by providing a special attribute called as ‘action’. It is used to define Page-Load actions. This attribute is available for other visualforce tags but here we will be discussing action attribute in ‘apex: page’ tag. This takes the name of the controller method as value and it controls how the Visualforce page should be displayed or any logic to be performed before page loads. This method is called before the page is rendered, and allows to optionally redirect the user to another page or perform some required calculation. Please find below code snippet to demo the use of ‘action’ attribute.
Thus, we can use “action” attribute in the visualforce page for controlling Visualforce page rendering. Also, it should not be used for initialization or DML operations.
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