如何替换 div 元素内段落内的文本？

Question

I need to set the text within a Paragraph that is within a DIV element dynamically. I know the divID and can get the div by id using get document.getElementById(divID) This returns the following:

<div id="mynote72031" class="mydiv" ondrop="drop(event,this.id)" ondragover="allowDrop(event)" style="cursor: move; display: block; top: 19px; left: 19px; width: 375px;">
  <a style="top:0px; right:5px;  position:absolute; color:#F00" href="javascript:;" onclick="hideElement(this)">X</a>
  <p id="noteContent1" ondblclick="editContent(this)">Note Number: 1</p>
</div>

The function should look like this:

function updateNote(divID, paragraphInnerHTML) {
  var updateNoteP = document.getElementById(divID);
  //Update Paragraph inside the DIV here
}

Note that the id of the paragraph is always noteContent1

Answer 1

There are 2 ways you can change the text within HTML tag

function updateNote(divID, paragraphInnerHTML) {
  var updateNoteP = document.getElementById(divID);
  //Update Paragraph inside the DIV here
  let $targetEle = updateNoteP.childNodes[1]
  // use innerHTML
  $targetEle.innerHTML = paragraphInnerHTML
  // or textContext
  $targetEle.textContent = paragraphInnerHTML 
}

Answer 2

You can use theNode.lastChild to access the p tag as it is the last element within the div tag

function updateNote(divID, paragraphInnerHTML) {
    var updateNoteP = document.getElementById(divID);
    //Update Paragraph inside the DIV here
    let pElement = updateNoteP.lastChild;
    pElement.innerHTML = paragraphInnerHTML;
}

Answer 3

Pretty close with your variable name, this assumes that it's html you wanna use. If it's just a string you can use updateNoteP.innerText instead

If you pass in pID as "noteContent1" this will change the content of the P

function updateNote(pID, paragraphInnerHTML) {
  var updateNoteP = document.getElementById(divID);
  // check that element is found
  if (updateNoteP) {
  // update inner html
   updateNoteP.parentElement.children[1].innerHTML = paragraphInnerHTML
  }
}