javascript , Making an image blink back and forth between visible and hidden (javascript)

Making an image blink back and forth between visible and hidden (javascript)


Tag: javascript

Ive created a timer that displays hidden images at certain times. So from 5 mins to 230 mins a green image is displayed. From 230 mins to 1 mins the javascript hides the green and displays yellow. From 1 min to 30 secs the javascript hides yellow and displays red. I would like for the red to begin blinking once the 30 second mark hits.

Here is my javascript:

var seconds = 300; //Variables for the code below
var countdownTimer;

function secondPassed(){
    var minutes = Math.floor(seconds/60); //takes the output of seconds/60 and makes rounds it down. 4.7 = 4, 3.7 = 3. (to keep the minutes displaying right)
    var remainingSeconds = seconds % 60; //takes remainder of seconds/60 and displays it. so 270/60 = 4.5 this displays it as 30 so it becomes 4:30 instead of 4.5
    if (remainingSeconds < 10) {  //if remaining seconds are less than 10 add a zero before the number. Displays numbers like 09 08 07 06
        remainingSeconds = "0" + remainingSeconds;  
    document.getElementById('countdown').innerHTML = minutes + ":" + remainingSeconds; //displays time in the html page  5:06
    document.getElementById('countdown2').innerHTML = minutes + ":" + remainingSeconds; //displays the time a second time
   if (seconds == 0) {
        clearInterval(countdownTimer);  //keeps value at zero once it hits zero. 0:00 will not go anymore
        alert("Time is Up, Try again");

function changeColor(){ //this changes the background color based on the time that has elapsed
    if (seconds <= 300 && seconds > 150) {  //green between 5:00 - 1:30
        // = "url("+colorChange[0]+")";
    else if (seconds <= 150 && seconds > 60) { //yellow between 1:30 - 30
        // = "url("+colorChange[1]+")";
    else if(seconds <= 60 && seconds > 30){ // red between 30 - 0
        // = "url("+colorChange[2]+")";
    else if (seconds <= 30 && secondes >= 0) {

function countdown(start){ //code for the button. When button is clicked  countdown() calls on secondPassed() to begin count down.
    if (seconds != 0) { //actual code to decrement the time
    seconds --;
    countdownTimer = setTimeout('countdown()', 1000);
    changeColor();  //calls the changeColor() function so that background changes
    start.disabled = true; //disables the "start" button after being pressed
    if (start.disabled = true){ //if one of the 'start' buttons are pressed both are disabled
    start2.disabled = true;

function cdpause() { //pauses countdown
        // pauses countdown

function cdreset() {
        // resets countdown
        cdpause(); //calls on the pause function to prevent from automatically starting after reset
        secondPassed(); //reverts back to original secondPassed() function
        document.getElementById('start').disabled = false; //Enables the "start" button that has been disabled from countdown(start) function.
        document.getElementById('start2').disabled = false; //enables the 'start2' button. same as above.
function startDisabled2() {
    start2.disabled == true;
    if (start2.disabled == true) {
    start.disabled = true;
function showGreen() {
    var imgGreen = document.getElementById('greenGo'); = 'visible';
function hideGreen() {
    var imgGreen = document.getElementById('greenGo'); = 'hidden';
function showYellow() {
    var imgYellow = document.getElementById('yellowAlmost'); = 'visible';
function hideYellow() {
    var imgYellow = document.getElementById('yellowAlmost'); = 'hidden';
function showRed() {
    var imgRed = document.getElementById('redStop'); = 'visible';
function hideRed() {
    var imgRed = document.getElementById('redStop'); = 'hidden';

I have attempted to add this snippet into the code but it does not work:

function blinkRed(){
var imgBlink = document.getElementById('redStop');

var intval = setInterval(function(){
    if( == 'hidden'){ = 'visible';
    } else { = 'hidden';
} 1000);

I am unsure as to what I am doing wrong. After inputting the above setInterval() my timer does not display. Would I need to create some sort of loop that will loop the image between visible and hidden. Or can the setInterval() function above work.


Looks like you're missing a comma before the milliseconds in your setInterval() function (right before the 1000)

From this:

var intervalID = window.setInterval(code, delay);


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