How to change button with tag <h2>

Question

I have a working random song generator that has a button for playing and pausing, as well as a button for randomizing songs. I do this using variables randand s, this is not the best way, but it works. I want the disclosure button to show that the song is pressed when it is pressed, but I don’t know how this happens, can anyone help?

HTML:

<audio id="1st" >
        <source src="intervals/1st.mp3" type = "audio/mp3"/>
    </audio>

    <audio id="2nd" >
        <source src="intervals/2nd.mp3" type = "audio/mp3"/>
    </audio>

    <audio id="3rd">
        <source src="intervals/3rd.mp3" type= "audio/mp3"/>
    </audio>

     <audio id="4th">
        <source src="intervals/4th.mp3" type= "audio/mp3"/>
    </audio>

    <audio id="5th">
        <source src="intervals/5th.mp3" type= "audio/mp3"/>
    </audio>

    <audio id="6th">
        <source src="intervals/6th.mp3" type="audio/mp3" />
    </audio>

    <audio id="7th">
        <source src="intervals/7th.mp3" type="audio/mp3" />
    </audio>

    <button type="button" id="reveal">Reveal</button>
    <button type="button" id="playButton"></button>
    <button type="button" id="randomise"></button>

JavaScript:

var playButtonJS = document.getElementById('playButton');
var randomiseJS = document.getElementById('randomise');
var revealJS = document.getElementById("reveal");
var FstJS = document.getElementById('1st');
var SndJS = document.getElementById('2nd');
var TrdJS = document.getElementById('3rd');
var FOthJS = document.getElementById('4th');
var FIthJS = document.getElementById('5th');
var SIthJS = document.getElementById('6th');
var SEthJS = document.getElementById('7th');


var audioPlaying = [FstJS, SndJS, TrdJS,FOthJS, FIthJS, SIthJS, SEthJS];

var rand = audioPlaying[Math.floor(Math.random() * audioPlaying.length)];

playButtonJS.addEventListener('click', playOrPause, false);
randomiseJS.addEventListener('click', random, false);
revealJS.addEventListener('click', rev, false);

function random() {
    rand.pause();
    playButtonJS.style.backgroundImage = 'url(playbutton.svg)';
    var song = audioPlaying[Math.floor(Math.random() * audioPlaying.length)];
    playButtonJS.style.backgroundImage = 'url(pausebutton.png)';
    songf(song);
}

function songf(s) {
    rand.currentTime=0;
    rand = s;

    if (!s.paused && !s.ended) {
        s.pause();
        playButtonJS.style.backgroundImage = 'url(playbutton.svg)';
    }
    else {
        s.play();
        playButtonJS.style.backgroundImage = 'url(pausebutton.png)';
    }
}

function playOrPause() {
    if (!rand.paused && !rand.ended) {
        rand.pause();
        playButtonJS.style.backgroundImage = 'url(playbutton.svg)';
    }
    else {
        rand.play();
        playButtonJS.style.backgroundImage = 'url(pausebutton.png)';
    }
}

Answer 1

JQuery solution:

rand , . "selectedindex". ? - , .

, . , <h2 id="name1">Name of the song</h2>...<h2 id ="name6">... . : ; , -

function reveal () {
   $("#name+rand").style.display = "block";
   console.log('You are playing the song number', rand)
}

/div/h 2 , HTML :

$("#label").html('Song is the number: '+ selectedIndex);

JQuery:

document.getElementById("label").innerHTML = "Song is number" +      
String(selectedIndex);

, .

$("#label").html('Song is:'+ ArrayOfNames[selectedIndex]);

JQuery:

document.getElementById("label").innerHTML = "Song is" +    
ArrayOfNames[selectedIndex];

: JQuery, .

Answer 2

, . th "songTitle" html .

document.getElementById("songTitle").innerHTML = "New song name";

https://www.w3schools.com/jsref/prop_html_innerhtml.asp

, .:)

Answer 3

var songNames = ["songName_1", "songName_2", "songName_3", "songName_4"];



function randomSong() {
  var songName = arguments[0][randomNum(0, songNames.length - 1)];
  document.getElementById("songName").innerHTML = songName;
}

document.getElementById("randomSong").addEventListener("click", function() {
  randomSong(songNames);
})


function randomNum(minNum, maxNum) {
  switch (arguments.length) {
    case 1:
      return parseInt(Math.random() * minNum + 1, 10);
      break;
    case 2:
      return parseInt(Math.random() * (maxNum - minNum + 1) + minNum, 10);
      break;
    default:
      return 0;
      break;
  }
}

<h2 id="songName"></h2>

<input id="randomSong" type="button" value="randomSong!" />

Run code

This is what I understand the meaning of brother, your code is really a bit dirty if there are problems you can ask me.

I have a better solution, but now I am at work and then sent to you.