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When do I want to render an outputpanel?
I want to render an outputpanel if list is not null. Thanks for contributing an answer to Salesforce Stack Exchange! Please be sure to answer the question. Provide details and share your research!
When to use JavaScript in the output panel?
The JavaScript invoked if the ondblclick event occurs–that is, if the user clicks the output panel twice. The JavaScript invoked if the onkeydown event occurs–that is, if the user presses a keyboard key.
What is an identifier for an outputpanel in HTML?
An identifier that allows the outputPanel component to be referenced by other components in the page. The base language for the generated HTML output, for example, “en” or “en-US”. For more information on this attribute, see the W3C specifications. The layout style for the panel.
What does the outputpanel class do in CSS?
The style class used to display the outputPanel component, used primarily to designate which CSS styles are applied when using an external CSS stylesheet.. The text to display as a tooltip when the user’s mouse pointer hovers over this component.
Is it possible to return Null from a render method?
Returning null from a component’s render method does not affect the firing of the component’s lifecycle methods. For instance componentDidUpdate will still be called. Is this page useful?
How to check if a list is null?
It can be used like so: if (myList == null) // Checks if list is null // Wasn’t initialized else if (myList.Count == 0) // Checks if the list is empty myList.Add (“new item”); else // List is valid and has something in it // You could access the element in the list if you wanted myList [0] gets the first item in the list.
Do you return an empty array or an empty collection?
Return an empty collection or an empty array instead. The general rule is that null and empty (0 item) collections or arrays should be treated the same. So, ideally you should never have a collection which is null if you follow this guideline from Microsoft.