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Why do I need a connectedcallback function in LWC?
Finally, the LWC lifecycle appears to require a connectedCallBack () function to be used in order to access public properties that are set after the initial run of the LWC constructor. I was able to get this code to work. And this appears to be the best option because of the LWC LifeCycle. More on this later.
How to call an APEX method from LWC?
Importing an apex method into LWC is easy. We simply need to specify the Apex class we’re importing from along with the method name. Here is the syntax import methodNameForLwc from ‘@salesforce/apex/ApexClassName.ApexMethodName
How to invoke / call child Lightning web component function from parent?
Check below example, On parent component we have button called “Click Me”, once that button clicked, “Parent function Invoked” checkbox on child component will be checked which is unchecked by default.
How to call a function without connectedcallback?
But to answer your primary question on how to call a function without connectedCallback you could take a look at the wire service. It is supposed to be reactive, so that when a parameter changes the function is automagically called for your, which should include the moment when the component loads.
Why does the contact field not rerender in LWC?
The value is set, and Jennifer Wu displays in the console, which means that the component did mutate the object. However, the component doesn’t rerender. Why? Because LWC can’t see that a property of the contact object changed. The contact field is decorated with @api, not @track. (A field can have only one decorator.)
How to call a function in Lightning component?
In your first example the function is declared and compiled as part of your component before it is called by the framework (then it is defined). But to answer your primary question on how to call a function without connectedCallback you could take a look at the wire service.
Is the execution dependent on the LWC lifecycle?
The issue appears to be related to what RO posted as an answer, the nature of functions returning values, and the LWC lifecycle. Execution is not order dependent as mentioned above.
How to call the handlepause function in JavaScript?
The handlePause() function in c-method-caller calls the pause() method in the c-video-player element. To return a value from a JavaScript method, use the return statement. For example, see the isPlaying() method in c-video-player.