tabs.vue
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<script>
import TabNav from './tab-nav';
export default {
name: 'ElTabs',
components: {
TabNav
},
props: {
type: String,
activeName: String,
closable: Boolean,
addable: Boolean,
value: {},
editable: Boolean,
tabPosition: {
type: String,
default: 'top'
},
beforeLeave: Function,
stretch: Boolean
},
provide() {
return {
rootTabs: this
};
},
data() {
return {
currentName: this.value || this.activeName,
panes: []
};
},
watch: {
activeName(value) {
this.setCurrentName(value);
},
value(value) {
this.setCurrentName(value);
},
currentName(value) {
if (this.$refs.nav) {
this.$nextTick(() => {
this.$refs.nav.$nextTick(_ => {
this.$refs.nav.scrollToActiveTab();
});
});
}
}
},
methods: {
calcPaneInstances(isLabelUpdated = false) {
if (this.$slots.default) {
const paneSlots = this.$slots.default.filter(vnode => vnode.tag &&
vnode.componentOptions && vnode.componentOptions.Ctor.options.name === 'ElTabPane');
// update indeed
const panes = paneSlots.map(({ componentInstance }) => componentInstance);
const panesChanged = !(panes.length === this.panes.length && panes.every((pane, index) => pane === this.panes[index]));
if (isLabelUpdated || panesChanged) {
this.panes = panes;
}
} else if (this.panes.length !== 0) {
this.panes = [];
}
},
handleTabClick(tab, tabName, event) {
if (tab.disabled) return;
this.setCurrentName(tabName);
this.$emit('tab-click', tab, event);
},
handleTabRemove(pane, ev) {
if (pane.disabled) return;
ev.stopPropagation();
this.$emit('edit', pane.name, 'remove');
this.$emit('tab-remove', pane.name);
},
handleTabAdd() {
this.$emit('edit', null, 'add');
this.$emit('tab-add');
},
setCurrentName(value) {
const changeCurrentName = () => {
this.currentName = value;
this.$emit('input', value);
};
if (this.currentName !== value && this.beforeLeave) {
const before = this.beforeLeave(value, this.currentName);
if (before && before.then) {
before.then(() => {
changeCurrentName();
this.$refs.nav && this.$refs.nav.removeFocus();
});
} else if (before !== false) {
changeCurrentName();
}
} else {
changeCurrentName();
}
}
},
render(h) {
let {
type,
handleTabClick,
handleTabRemove,
handleTabAdd,
currentName,
panes,
editable,
addable,
tabPosition,
stretch
} = this;
const newButton = editable || addable
? (
<span
class="el-tabs__new-tab"
on-click={ handleTabAdd }
tabindex="0"
on-keydown={ (ev) => { if (ev.keyCode === 13) { handleTabAdd(); }} }
>
<i class="el-icon-plus"></i>
</span>
)
: null;
const navData = {
props: {
currentName,
onTabClick: handleTabClick,
onTabRemove: handleTabRemove,
editable,
type,
panes,
stretch
},
ref: 'nav'
};
const header = (
<div class={['el-tabs__header', `is-${tabPosition}`]}>
{newButton}
<tab-nav { ...navData }></tab-nav>
</div>
);
const panels = (
<div class="el-tabs__content">
{this.$slots.default}
</div>
);
return (
<div class={{
'el-tabs': true,
'el-tabs--card': type === 'card',
[`el-tabs--${tabPosition}`]: true,
'el-tabs--border-card': type === 'border-card'
}}>
{ tabPosition !== 'bottom' ? [header, panels] : [panels, header] }
</div>
);
},
created() {
if (!this.currentName) {
this.setCurrentName('0');
}
this.$on('tabLabelChanged', this.calcPaneInstances.bind(null, true));
},
mounted() {
this.calcPaneInstances();
},
updated() {
this.calcPaneInstances();
}
};
</script>