When using Vue 2.5, I encountered an issue with a canvas element that has a key event listener:
<template>
<canvas v-on:keyup.esc="abortThing"></canvas>
</template>
<script>
export default {
methods: {
abortThing() {
console.log('you hit escape!');
}
}
}
</script>
The problem lies in the fact that the event listener fails to trigger upon hitting the escape key, regardless of whether the canvas has been interacted with previously or not.
After some experimentation, I found that browsers do not allow canvas elements to be focused by default. Other active elements like buttons or forms respond to keyup events without any issues.
Fortunately, there is a property called tabindex that determines if an element can be focused and in what order when tabbing through. Setting the tabindex to 0 will make the canvas focused by default. The interaction between canvas elements and keyboard focus is not well-documented, but it appears that browsers tend to resist focusing on canvases compared to other element types.
Demonstrating this behavior can be tricky in a snippet, as it essentially asserts the tabindex for the entire window. You may need to click on the blue area before pressing escape to observe the effect.
Vue.config.productionTip = false;
new Vue({
template: `<div>
<canvas tabindex="0" v-on:keyup.esc="abortThing" style="width:100px;height:100px;background-color:blue"></canvas>
</div>`,
methods: {
abortThing(event) {
console.log(event);
}
}
}).$mount("#app");<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
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