将跨度显示更改为只读输入

Question

I have a timer countdown which displays in a <span> , I need it to output into a readonly <input> instead so I can calculate with the value. Is there any way to change this?

I tried

document.getElementById("timedown").value = display;

I tried various other things which just got messy and didn't work. Below is the function and the input

function startTimer(duration, display) {
var start = Date.now(),
    diff,
    minutes,
    seconds;
function timer() {
    diff = duration - (((Date.now() - start) / 1000) | 0);

    minutes = (diff / 60) | 0;
    seconds = (diff % 60) | 0;

    minutes = minutes < 10 ? "0" + minutes : minutes;
    seconds = seconds < 10 ? "0" + seconds : seconds;

    display.textContent = minutes + ":" + seconds; 

    if (diff <= 0) {
        // faaopoopo se tasi sekone

        start = Date.now() + 1000;
    }
};
// amata vave
timer();
setInterval(timer, 1000);
}

window.onload = function () {  
var fiveMinutes = 60 * 10,
    display = document.querySelector('#time');

startTimer(fiveMinutes, display);
};

<div class="transtime">
  <form>
    <input type="text" id="timedown" value="0" readonly/>
  </form>
</div>

Answer 1

Here is a working codepen Change the function to this:

    function timer() {
    diff = duration - (((Date.now() - start) / 1000) | 0);

    minutes = (diff / 60) | 0;
   seconds = (diff % 60) | 0;

    minutes = minutes < 10 ? "0" + minutes : minutes;
    seconds = seconds < 10 ? "0" + seconds : seconds;

    display.value= minutes + ":" + seconds; 

    if (diff <= 0) {
        // faaopoopo se tasi sekone

        start = Date.now() + 1000;
    }
};

changing the value instead of the text value and it should work

Answer 2

Change

display.textContent = minutes + ":" + seconds; 

to

document.getElementById("timedown").value = minutes + ":" + seconds; 

or change

display = document.querySelector('#timedown');

and

display.value = minutes + ":" + seconds;