I am having trouble getting a javascript function to reset itself after an onclick event. When I click the "Start" button the counter begins to count up. But when I click the "Reset" button nothing happens. I need the timer to reset to "0:00" and wait for me to click "Start" again. Here is my code:
<script type="text/javascript">
var seconds = 0;
var minutes = 0;
function zeroPad(time) {
var numZeropad = time + '';
while(numZeropad.length < 2) {
numZeropad = "0" + numZeropad;
}
return numZeropad;
}
function countSecs() {
seconds++;
if (seconds > 59) {
minutes++;
seconds = 0;
}
document.getElementById("timeBox").innerHTML = "Time " + zeroPad(minutes) + ":" + zeroPad(seconds);
}
function startTimer() {
action = window.setInterval(countSecs,1000);
}
function resetTimer() {
var seconds = 0;
var minutes = 0;
}
</script>
<body>
<button onclick = "startTimer()">Start</button>
<div id="timeBox">Time 00:00</div>
<button onclick = "resetTimer">Reset</button>
</body>
I am having trouble getting a javascript function to reset itself after an onclick event. When I click the "Start" button the counter begins to count up. But when I click the "Reset" button nothing happens. I need the timer to reset to "0:00" and wait for me to click "Start" again. Here is my code:
<script type="text/javascript">
var seconds = 0;
var minutes = 0;
function zeroPad(time) {
var numZeropad = time + '';
while(numZeropad.length < 2) {
numZeropad = "0" + numZeropad;
}
return numZeropad;
}
function countSecs() {
seconds++;
if (seconds > 59) {
minutes++;
seconds = 0;
}
document.getElementById("timeBox").innerHTML = "Time " + zeroPad(minutes) + ":" + zeroPad(seconds);
}
function startTimer() {
action = window.setInterval(countSecs,1000);
}
function resetTimer() {
var seconds = 0;
var minutes = 0;
}
</script>
<body>
<button onclick = "startTimer()">Start</button>
<div id="timeBox">Time 00:00</div>
<button onclick = "resetTimer">Reset</button>
</body>
4 Answers
Reset to default 1Call the clearInterval() method.
function resetTimer() {
window.clearInterval(action);
}
This is a scoping issue, using var inside a function, makes seconds and minutes local to that function. Removing the leading var will start you off in the right direction.
function resetTimer() {
seconds = 0;
minutes = 0;
}
Onclick events must call functions like: onclick="resetTimer();" with the parenthesis at the end. Some browsers may try to submit on button clicks if you don't define type="button". I didn't assume you wanted reset timer to stop the timer so I added a stop button.
http://jsfiddle/iambriansreed/WRdSK/
<button type="button" onclick="startTimer();">Start</button>
<div id="timeBox">Time 00:00</div>
<button type="button" onclick="resetTimer();">Reset</button>
<button type="button" onclick="stopTimer();">Stop</button>
<script>
window.seconds = 0;
window.minutes = 0;
function startTimer() {
window.action = setInterval(countSecs,1000);
}
function resetTimer() {
seconds = 0;
minutes = 0;
}
function stopTimer() {
clearInterval(action);
seconds = -1;
minutes = 0;
countSecs();
}
function zeroPad(time) {
var numZeropad = time + '';
while(numZeropad.length < 2) {
numZeropad = "0" + numZeropad;
}
return numZeropad;
}
function countSecs() {
seconds++;
if (seconds > 59) {
minutes++;
seconds = 0;
}
document.getElementById("timeBox").innerHTML = "Time " + zeroPad(minutes) + ":" + zeroPad(seconds);
}
</script>
You have two errors in your code:
First, in the button you missed the () after the function's name in order to make an actual call:
<button onclick = "resetTimer()">Reset</button>
Second, you did not stop the interval using window.clearInterval() (MDN docu), so the timer went on and on.
// just to make it an explicit global variable. already was an implicit one.
var action;
// rest of your code
function resetTimer() {
// clear the timer
window.clearInterval( action );
// reset variables
var seconds = 0;
var minutes = 0;
// update output
document.getElementById("timeBox").innerHTML = "Time " + zeroPad(minutes) + ":" + zeroPad(seconds);
}
I set up a working fiddle here.
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