Passing a dynamically created variable to another function (Vanilla Javascript)-CodePudding

I have updated my question to include the code. The "updateNewP" function is not updating the innerHTML but it is not throwing an error. Do I need to add "this" somewhere in both of these functions? Javascript:

let initial = document.getElementById("test");
initial.addEventListener("click", newPElement);

let update = document.getElementById("update");
update.addEventListener("click", updateNewP);

let myTextArea = document.getElementById("textArea");

//function that creates a P
function newPElement(){
let newP = document.createElement("p");
newP.classList.add("myFont");
newP.innerHTML = "Initial Text";
myTextArea.appendChild(newP);
return newP;
}

function updateNewP(newP){
    newP.innerHTML ="Updated";
}

HTML:

<h1>Testing</h1>
    <button id="test" >Test</button>
    <button id="update">Update</button>
    <section id="textArea">
    </section>

CodePudding user response：

The newP variable that was declared within functionA is only available in functionA. If you need to work with this variable in a newPUpdate, it needs to be passed as an argument:

function functionA() {
  const newP = document.createElement("div");
  newPUpdate(newP);
}

function newPUpdate(elem) {
  elem.innerHTML = `${someVariable}`;
}

Looking up variable scope in javascript will help you understand what's going on.

CodePudding user response：

The addEventListener passes event to the function. Event does not have the innerHTML key because it is not an element.