The thread that links to is specific to the Error Message that shows up when respondents use the Back button within a Table of Contents.

The 'this page says' alert prompt is a browser message and I don't believe that can be changed.

Instead, it is recommended to use something like a modal. I explored that a bit here: https://community.qualtrics.com/custom-code-12/javascript-for-popup-message-22409

However, in that thread, the HTML is difficult to get at because of the migration. You might go with qualtrics_nerd's solution of a custom dialog box, though you will need to adjust the JS a bit to work for your question.

You could also use Custom Validation to include a custom message to respondents that don't fill in the text.

Ah, I see. Thanks @Tom_1842  - I’ll check out qualtric_nerd’s solution. Thank you

Hi @MikeW ,

Thanks for your patience.
Here is an updated code which creates custom prompt and accept text and satisfy all the condition  as per your previous question:

 

Qualtrics.SurveyEngine.addOnload(function()
{
	/*Place your JavaScript here to run when the page loads*/

});

Qualtrics.SurveyEngine.addOnReady(function()
{

	let radio=document.querySelectorAll(".q-checkbox");
 let box=document.querySelectorAll("inputptype=text]");

function cprompt(index) {
  const overlay = document.body.appendChild(document.createElement("div"));
  overlay.style.cssText = `
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
  `;

  const dialogBox = overlay.appendChild(document.createElement("div"));
  dialogBox.style.cssText = `
    background-color: #fff;
    border: 1px solid #000;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
    padding: 1em;
    text-align: center;
    width: 30%;
  `;

  const message = dialogBox.appendChild(document.createElement("p"));
  message.textContent = "Enter comment here:";
  message.style.cssText = `
    color:black;
  `;

  const input = dialogBox.appendChild(document.createElement("input"));
  input.type = "text";

if(boxbindex].value!==""){
  input.value = boxbindex].value;}
  input.style.cssText = `
    margin-top: 1em;
    width: 100%;
    color:black;
  `;

  const okButton = dialogBox.appendChild(document.createElement("button"));
  okButton.textContent = "Okay";
  okButton.style.cssText = `
    background-color: #ccc;
    border: 1px solid #000;
    border-radius: 5px;
    margin-top: 1em;
    padding: 0.5em;
    width: 100%;
  `;
  okButton.addEventListener("click", () => {
    document.body.removeChild(overlay);
    boxbindex].value = input.value;
      if (boxbindex].value !== "") {
      radiodindex].parentElement.style.background = "yellow";
    } else {
      radiodindex].parentElement.style.background = "green";
    }
  });


}



for (let i = 0; i < radio.length; i++) {
  radiodi].addEventListener("contextmenu", (event) => {
    cprompt(i);
    event.preventDefault();
  });
}

});

Qualtrics.SurveyEngine.addOnUnload(function()
{
	/*Place your JavaScript here to run when the page is unloaded*/

});

Hope this resolves your query!!

Thanks so much @qualtrics_nerd - brilliant! Thank you