How to highlight tree node on click of button in element-ui - element-ui

Question

I am having el-tree> element and 1 button showNode.
so on click of this button i want to highlight a node with given index.
How to call highlight-current on click of button?

Answer 1

From documentation:
highlight-current: whether current node is highlighted
highlight-current is just a read-only attribute, in order to highlight a specific node, you have to call the method setCurrentKey
setCurrentKey: set highlighted node by key, only works when node-key is assigned, the param (key) is the node's key to be highlighted
So, you need first to add a key to every node, using the property key:
node-key: unique identity key name for nodes, its value should be unique across the whole tree
Like following example:
<el-tree
:data="myData"
node-key="id">
</el-tree>
And then, call the method setCurrentKey on the click event attached to your button:
<el-button #click="setCurrentKey(myData[index].id)">Highlight the n-index node</el-button>
I hope it helps you, bye.
Updated: The code above works only on 2.x version, here an example to highlite a node on version 1.4.13 (but I can't expand a node, so I had to expand all the tree):
var Main = {
data() {
return {
data: [{
label: 'Level one 1',
id: 1,
children: [{
label: 'Level two 1-1',
id: 11
}]
}, {
label: 'Level one 2',
id: 2,
children: [{
label: 'Level two 2-1',
id: 21,
children: [{
label: 'Level three 2-1-1',
id: 211
}]
}, {
label: 'Level two 2-2',
id: 22,
children: [{
label: 'Level three 2-2-1',
id: 221
}]
}]
}],
defaultProps: {
children: 'children',
label: 'label'
}
};
},
methods: {
handleNodeClick(data) {
console.log(data);
},
renderContent(h, { node, data, store }) {
let btn = h('span', {
props: {type: 'success'},
domProps: {
innerHTML: data.label,
id: "node-id-" + data.id
}
})
return btn
},
handleBtnClick(){
//Highlite the 211
document.getElementById("node-id-211").style.backgroundColor="yellow";
}
}
};
var Ctor = Vue.extend(Main)
new Ctor().$mount('#app')
#import url("//unpkg.com/element-ui#1.4.13/lib/theme-default/index.css");
<script src="//unpkg.com/vue/dist/vue.js"></script>
<script src="//unpkg.com/element-ui#1.4.13/lib/index.js"></script>
<div id="app">
<el-tree :data="data" :props="defaultProps" #node-click="handleNodeClick" :render-content="renderContent" :default-expand-all="true"></el-tree>
<el-button #click="handleBtnClick">Highlight the 211 node</el-button>
</div>