1.) with the where filter 2.) definition expression 3.) iterating through all attribute ids and bringing them back.
The problem: All exists for only allowing/displaying one per attribute id at a time.. my goal is to feed the attribute ids into a checkbox list (which I have done), but allowing for items via attribute id to be added to the map as they are checked, collectively, one at a time - currently I can not seem to get this to work with the aspect of having multiple or more then one appear at a time on the map - each filter or attempt results in the next item being added while at the same time the previous is replaced (only showing one at a time).
1.) i.e. the below filter (attempted logic 1) - & also here is CodePen of:
..... function filterByID(event) { const selectedID = event.target.getAttribute("data-id"); eqLayerView.filter = { where: "id = '" + selectedID + "'" }; } view.whenLayerView(fl) .then(function(layerView) { eqLayerView = layerView; eqLayerView.filter = { where: "id = ''" };.............
2.) i.e. another attempted logic (adding multiple at a time here, line by line, or via array):
layer.definitionExpression = "id = 'us70008jr5'",layer.definitionExpression = "id = 'cgi988jr52'",
3.) i.e. 3rd attempt with a suggestion here on GIS exchange: Loop through attribute ids of FeatureLayer
layer .load() .then(() => { // create a query from the layer const query = layer.createQuery(); query.returnDistinctValues = true; query.where = "grid_value > 2"; // or 1=1 if you need them all // the field you want distinct values for query.outFields = ["id"]; return layer.queryFeatures(query); }) .then(({ features }) => { // extract the ids to a list const ids = features.map(({ attributes }) => attributes.id); return ids; }) .then((ids) => { // You can store them how you want, in this case, // I put them in a dropdown select menu const fragment = document.createDocumentFragment(); ids.forEach((id) => { const option = document.createElement('option'); option.value = id; option.innerText = id; fragment.appendChild(option); }); list.appendChild(fragment); map.add(layer);});
All attempted logic above result in the toggling of a shakemap by attribute id to be displayed only one at a time — by toggling a new on, the previous turns off, I need the ability to have multiple being able to exist on the map at once.
