In mapbox how do I move a Feature to top (z-index wise)? - mapbox

Question

I have a layer full of state border "Features". When a user clicks on a State, I want to move that state's Feature to the top of the stack (z-index wise).
export function drawStateBorders() {
$.getJSON('https://www.mapbox.com/mapbox-gl-js/assets/us_states.geojson').then((data) => {
this.stateGeoJSON = data;
this.map
.addSource('states', {
type: 'geojson',
data,
})
.addLayer({
id: 'state-borders',
type: 'line',
source: 'states',
paint: {
'line-color': [
'case', ['boolean', ['feature-state', 'selected'], false],
'#8d8b76',
'#bfe2ab',
],
'line-width': [
'case', ['boolean', ['feature-state', 'selected'], false],
6,
3,
],
},
});
});
}
When I select the state
export function stateSelected(state) {
const stateFeatures = this.map.queryRenderedFeatures({
layers: ['state-borders'],
filter: [
'==', 'STATE_NAME', state,
],
});
const features = this.stateGeoJSON.features;
const currentFeature = stateFeatures[0];
if (!currentFeature) {
return;
}
// same state
if (currentFeature.id === this.selectedStateId) return;
// move to front HERE ?????
// old selected state
if (this.selectedStateId) {
this.map.setFeatureState({
source: 'states',
id: this.selectedStateId,
}, {
selected: false,
});
}
this.selectedStateId = currentFeature.id;
this.map.setFeatureState({
source: 'states',
id: this.selectedStateId,
}, {
selected: true,
});
}
So far I've tried
features.splice(features.indexOf(currentFeature), 1);
features.push(currentFeature);
this.map.getSource('states').setData(this.stateGeoJSON);
This seems to do some really crazy stuff to the array (duplicating some states, removing others). No idea what's happening

Answer 1

Adding the state to another layer worked (thanks #AndrewHarvey for the advice).
In case anyone is interested here is my code
export function stateSelected(state) {
const features = this.stateGeoJSON.features;
const currentFeature = features.find(s => s.properties.NAME === state);
if (!currentFeature) {
return;
}
// removes active layer
this.removeLayersContaining('state-borders-active');
this.drawActiveStateLayer(currentFeature);
}
export function drawActiveStateLayer(feature) {
this.map
.addLayer({
id: 'state-borders-active',
type: 'line',
source: {
type: 'geojson',
data: feature
},
paint: {
'line-color': '#8d8b76',
'line-width': 6,
},
});
}
export function drawStateBorders() {
$.getJSON('states.json').then((data) => {
this.stateGeoJSON = data;
this.map
.addSource('states', {
type: 'geojson',
data,
})
.addLayer({
id: 'state-borders',
type: 'line',
source: 'states',
paint: {
'line-color': '#bfe2ab',
'line-width': 3,
},
});
});
Also this is the shapefile I'm using: http://eric.clst.org/assets/wiki/uploads/Stuff/gz_2010_us_040_00_500k.json