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<script>
import { GlDropdown, GlDropdownItem } from '@gitlab/ui';
function getHeaderNumber(el) {
return parseInt(el.tagName.match(/\d+/)[0], 10);
}
export default {
components: {
GlDropdown,
GlDropdownItem,
},
data() {
return {
isHidden: false,
items: [],
};
},
mounted() {
this.blobViewer = document.querySelector('.blob-viewer[data-type="rich"]');
this.observer = new MutationObserver(() => {
if (this.blobViewer.classList.contains('hidden')) {
this.isHidden = true;
} else if (this.blobViewer.getAttribute('data-loaded') === 'true') {
this.isHidden = false;
this.generateHeaders();
}
});
if (this.blobViewer) {
this.observer.observe(this.blobViewer, {
attributes: true,
});
}
},
beforeDestroy() {
if (this.observer) {
this.observer.disconnect();
}
},
methods: {
generateHeaders() {
const headers = [...this.blobViewer.querySelectorAll('h1,h2,h3,h4,h5,h6')];
if (headers.length) {
const firstHeader = getHeaderNumber(headers[0]);
headers.forEach((el) => {
this.items.push({
text: el.textContent.trim(),
anchor: el.querySelector('a').getAttribute('id'),
spacing: Math.max((getHeaderNumber(el) - firstHeader) * 8, 0),
});
});
}
},
},
};
</script>
<template>
<gl-dropdown v-if="!isHidden && items.length" icon="list-bulleted" class="gl-mr-2" lazy>
<gl-dropdown-item v-for="(item, index) in items" :key="index" :href="`#${item.anchor}`">
<span
:style="{ 'padding-left': `${item.spacing}px` }"
class="gl-display-block"
data-testid="tableContentsLink"
>
{{ item.text }}
</span>
</gl-dropdown-item>
</gl-dropdown>
</template>
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