回答編集履歴
1
タイマーをオブジェクトとして正しく扱うように修正
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@@ -1,5 +1,15 @@
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これでどうでしょうか。
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修正
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タイマーをオブジェクトとして正しく扱うようにしました。
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デザインについては自信がありません:-)
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```HTML
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<!DOCTYPE HTML>
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<script>
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var starter = document.querySelector('#starter');
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var stopper = document.
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var stopper = document.querySelector('#stopper');
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//タイマー
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//タイマーインスタンスを格納する配列
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var timerArray = [
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new Timer('label0', 'minBox0', 'secBox0'),
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new Timer('label1', 'minBox1', 'secBox1'),
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new Timer('label2', 'minBox2', 'secBox2'),
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];
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//タイマーのコンストラクタ
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function Timer(label, minBox, secBox) {
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this.intervalID = null; // nullのとき停止中
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this.label = document.querySelector('#' + label);
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this.minBox = document.querySelector('#' + minBox);
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this.secBox = document.querySelector('#' + secBox);
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}
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//タイマー開始メソッド
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Timer.prototype.startTimer = function() {
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this.stopTimer()
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var min = this.minBox.value;
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var sec = this.secBox.value;
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if (min === "" && sec === "") {
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alert(this.label.innerText + "に時間を設定してください！");
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return;
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}
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min = (min === "" ? 0 : parseInt(min, 10));
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sec = (sec === "" ? 0 : parseInt(sec, 10));
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//不正な数値の場合
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if (! isFinite(min) || ! isFinite(sec) ||
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min < 0 || sec < 0 || (min === 0 && sec === 0))
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{
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alert(this.label.innerText + "に正しい時間を設定してください！");
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return;
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}
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this.minBox.readonly = true;
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this.secBox.readonly = true;
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this.minBox.value = min;
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this.secBox.value = sec;
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this.countDown();
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};
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//カウントダウンする関数を1000ミリ秒毎に呼び出すメソッド
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Timer.prototype.countDown = function()
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{
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//setIntervalのコールバック関数ではthisが変わるのでtimerで代用
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var timer = this;
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this.intervalID = setInterval(function() {
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var min = parseInt(timer.minBox.value, 10);
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var sec = parseInt(timer.secBox.value, 10);
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var totalSec = min * 60 + sec - 1;
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if (totalSec <= 0) {
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timer.stopTimer();
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totalSec = 0;
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}
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//残り分数はintを60で割って切り捨てる
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timer.minBox.value = Math.floor(totalSec / 60);
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//残り秒数はintを60で割った余り
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timer.secBox.value = totalSec % 60;
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}, 1000);
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};
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//タイマー停止メソッド
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Timer.prototype.stopTimer = function() {
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if (this.intervalID !== null) {
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clearInterval(this.intervalID);
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this.intervalID = null;
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}
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this.minBox.readonly = false;
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this.secBox.readonly = false;
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};
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//全タイマー開始関数
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function startTimers() {
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for (var no in timerArray) {
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timerArray[no].startTimer();
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}
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}
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@@ -166,151 +322,11 @@
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//全タイマー停止関数
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function stopTimers()
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function stopTimers() {
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{
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for (var no in timerArray) {
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clearTimer(timerArray[no]);
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}
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}
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//全タイマー開始関数
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function startTimers()
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{
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for (var no in timerArray) {
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var timer = timerArray[no];
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clearTimer(timer)
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var min = timer.minBox.value;
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var sec = timer.secBox.value;
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if (min === "" && sec === "") {
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alert(timer.label.innerText + "に時間を設定してください！");
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continue;
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}
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min = (min === "" ? 0 : parseInt(min, 10));
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sec = (sec === "" ? 0 : parseInt(sec, 10));
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//不正な数値の場合
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if (! isFinite(min) || ! isFinite(sec) ||
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min < 0 || sec < 0 || (min === 0 && sec === 0)) {
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alert(timer.label.innerText + "に正しい時間を設定してください！");
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continue;
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}
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timer
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timerArray[no].stopTimer();
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timer.secBox.value = sec;
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timer.minBox.disabled = true;
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timer.secBox.disabled = true;
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countDown(timer);
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}
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}
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//カウントダウンする関数を1000ミリ秒毎に呼び出す関数
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function countDown(timer)
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{
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timer.intervalID = setInterval(function() {
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var min = parseInt(timer.minBox.value, 10);
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var sec = parseInt(timer.secBox.value, 10);
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var totalSec = min * 60 + sec - 1;
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if (totalSec < 0) {
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clearTimer(timer);
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}
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else {
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timer.minBox.value = Math.floor(totalSec / 60);
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//残り秒数はintを60で割った余り
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timer.secBox.value = totalSec % 60;
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}
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}, 1000);
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}
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//タイマー停止関数
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function clearTimer(timer)
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{
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if (timer.intervalID !== null) {
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clearInterval(timer.intervalID);
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timer.intervalID = null;
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timer.minBox.disabled = false;
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timer.secBox.disabled = false;
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}
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