mirror of https://github.com/sveltejs/svelte
fix event handlers that are dynamic via reactive declarations or stores (#4394)
parent
0625fc218b
commit
7f2ffb2977
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export default {
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html: `
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<button>toggle</button>
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<p>0</p>
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<button>handler_a</button>
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<button>handler_b</button>
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`,
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async test({ assert, target, window }) {
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const [toggle, handler_a, handler_b] = target.querySelectorAll('button');
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const p = target.querySelector('p');
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const event = new window.MouseEvent('click');
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await handler_a.dispatchEvent(event);
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assert.equal(p.innerHTML, '1');
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await toggle.dispatchEvent(event);
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await handler_a.dispatchEvent(event);
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assert.equal(p.innerHTML, '2');
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await toggle.dispatchEvent(event);
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await handler_b.dispatchEvent(event);
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assert.equal(p.innerHTML, '1');
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await toggle.dispatchEvent(event);
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await handler_b.dispatchEvent(event);
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assert.equal(p.innerHTML, '2');
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},
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};
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@ -0,0 +1,20 @@
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<script>
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import { writable } from 'svelte/store';
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let number = 0;
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const handler_1 = () => number = 1;
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const handler_2 = () => number = 2;
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let flag = true;
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$: handler_a = flag ? handler_1 : handler_2;
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const handler_b = writable();
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$: handler_b.set(flag ? handler_1 : handler_2);
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</script>
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<button on:click={() => flag = !flag}>toggle</button>
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<p>{number}</p>
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<button on:click={handler_a}>handler_a</button>
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<button on:click={$handler_b}>handler_b</button>
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