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Merge pull request #193 from otmon76/1.11.2
Promise
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‎1-js/11-async/02-promise-basics/01-re-resolve/solution.md

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The output is: `1`.
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Výstup je: `1`.
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The second call to `resolve` is ignored, because only the first call of `reject/resolve` is taken into account. Further calls are ignored.
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Druhé volání `splň` se ignoruje, protože v úvahu se bere vždy jen první volání `splň/zamítni`. Další volání jsou ignorována.

‎1-js/11-async/02-promise-basics/01-re-resolve/task.md

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# Re-resolve a promise?
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# Znovusplnění příslibu?
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What's the output of the code below?
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Jaký je výstup následujícího kódu?
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```js
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let promise = new Promise(function(resolve, reject) {
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resolve(1);
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let příslib = new Promise(function(splň, zamítni) {
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splň(1);
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setTimeout(() => resolve(2), 1000);
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setTimeout(() => splň(2), 1000);
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});
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promise.then(alert);
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příslib.then(alert);
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```

‎1-js/11-async/02-promise-basics/02-delay-promise/solution.md

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```js run
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function delay(ms) {
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return new Promise(resolve => setTimeout(resolve, ms));
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function čekej(ms) {
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return new Promise(splň => setTimeout(splň, ms));
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}
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delay(3000).then(() => alert('runs after 3 seconds'));
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čekej(3000).then(() => alert('spustí se za 3 sekundy'));
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```
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Please note that in this task `resolve` is called without arguments. We don't return any value from `delay`, just ensure the delay.
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Prosíme všimněte si, že v této úloze je `splň` voláno bez argumentů. Z funkce `čekej` nevracíme žádnou hodnotu, jen zajistíme čekání.

‎1-js/11-async/02-promise-basics/02-delay-promise/task.md

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# Delay with a promise
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# Čekání s příslibem
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The built-in function `setTimeout` uses callbacks. Create a promise-based alternative.
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Vestavěná funkce `setTimeout` používá callbacky. Vytvořte alternativu založenou na příslibech.
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The function `delay(ms)` should return a promise. That promise should resolve after `ms` milliseconds, so that we can add `.then` to it, like this:
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Funkce `čekej(ms)` by měla vrátit příslib. Tento příslib by se měl splnit za `ms` milisekund, takže do něj můžeme přidat `.then`, například:
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```js
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function delay(ms) {
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// your code
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function čekej(ms) {
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// váš kód
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}
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delay(3000).then(() => alert('runs after 3 seconds'));
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čekej(3000).then(() => alert('spustí se za 3 sekundy'));
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```

‎1-js/11-async/02-promise-basics/03-animate-circle-promise/solution.view/index.html

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<body>
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<button onclick="go()">Click me</button>
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<button onclick="spusť()">Klikni na mne</button>
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<script>
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function go() {
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showCircle(150, 150, 100).then(div => {
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function spusť() {
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zobrazKruh(150, 150, 100).then(div => {
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div.classList.add('message-ball');
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div.append("Hello, world!");
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div.append("Ahoj, světe!");
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});
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}
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function showCircle(cx, cy, radius) {
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function zobrazKruh(cx, cy, poloměr) {
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let div = document.createElement('div');
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div.style.width = 0;
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div.style.height = 0;
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return new Promise(resolve => {
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setTimeout(() => {
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div.style.width = radius * 2 + 'px';
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div.style.height = radius * 2 + 'px';
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div.style.width = poloměr * 2 + 'px';
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div.style.height = poloměr * 2 + 'px';
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div.addEventListener('transitionend', function handler() {
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div.removeEventListener('transitionend', handler);

‎1-js/11-async/02-promise-basics/03-animate-circle-promise/task.md

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# Animated circle with promise
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# Animovaný kruh s příslibem
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Rewrite the `showCircle` function in the solution of the task <info:task/animate-circle-callback> so that it returns a promise instead of accepting a callback.
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Přepište funkci `zobrazKruh` v řešení úlohy <info:task/animate-circle-callback> tak, aby místo přijímání callbacku vracela příslib.
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The new usage:
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Nové použití:
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```js
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showCircle(150, 150, 100).then(div => {
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zobrazKruh(150, 150, 100).then(div => {
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div.classList.add('message-ball');
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div.append("Hello, world!");
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div.append("Ahoj, světe!");
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});
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```
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Take the solution of the task <info:task/animate-circle-callback> as the base.
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Jako základ vezměte řešení úlohy <info:task/animate-circle-callback>.

‎1-js/11-async/02-promise-basics/article.md

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‎1-js/11-async/02-promise-basics/head.html

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<script>
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function loadScript(src) {
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function načtiSkript(src) {
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return new Promise(function(resolve, reject) {
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let script = document.createElement('script');
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script.src = src;
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let skript = document.createElement('script');
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skript.src = src;
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script.onload = () => resolve(script);
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script.onerror = () => reject(new Error("Script load error: " + src));
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skript.onload = () => resolve(skript);
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skript.onerror = () => reject(new Error("Chyba při načítání skriptu: " + src));
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document.head.append(script);
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document.head.append(skript);
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});
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}
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</script>

‎1-js/11-async/02-promise-basics/promise-reject-1.svg

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‎1-js/11-async/02-promise-basics/promise-resolve-1.svg

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‎1-js/11-async/02-promise-basics/promise-resolve-reject.svg

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