Mona Coder
Reputation: 6316
How to check if dynamic array is empty or not?
How I can check if a Mapped object is empty or not? Basically what I need to do is checking if there is any Array of Fuses in the data? If not, then do something else.
if(e.attributes.display=='Fuses') {
if((e.attributes.display == 'Fuses').length == 0){
console.log("No Data For Fuses");
}else{
fuses.push([e.geometry.x,e.geometry.y]);
}
}
var data = [{
"displayFieldName": "",
"fieldAliases": {
"OBJECTID": "OBJECTID"
},
"fields": [{
"name": "OBJECTID",
"type": "esriFieldTypeOID",
"alias": "OBJECTID"
}],
"features": [{
"attributes": {
"OBJECTID": 649
}
},
{
"attributes": {
"OBJECTID": 665
}
},
{
"attributes": {
"OBJECTID": 762
}
}
]
},
{
"displayFieldName": "",
"fieldAliases": {
"display": "display",
"OBJECTID": "OBJECTID"
},
"geometryType": "esriGeometryPoint",
"spatialReference": {
"wkid": 4326,
"latestWkid": 4326
},
"fields": [{
"name": "display",
"type": "esriFieldTypeString",
"alias": "display",
"length": 50
},
{
"name": "OBJECTID",
"type": "esriFieldTypeOID",
"alias": "OBJECTID"
}
],
"features": [{
"attributes": {
"display": "Transformer",
"OBJECTID": 1537
},
"geometry": {
"x": -88.17602806699995,
"y": 41.78431233100008
}
},
{
"attributes": {
"display": "Transformer",
"OBJECTID": 1591
},
"geometry": {
"x": -88.17546081099994,
"y": 41.783341919000065
}
}
]
},
{
"displayFieldName": "",
"fieldAliases": {
"display": "display",
"OBJECTID": "OBJECTID"
},
"geometryType": "esriGeometryPoint",
"spatialReference": {
"wkid": 4326,
"latestWkid": 4326
},
"fields": [{
"name": "display",
"type": "esriFieldTypeString",
"alias": "display",
"length": 50
},
{
"name": "OBJECTID",
"type": "esriFieldTypeOID",
"alias": "OBJECTID"
}
],
"features": [{
"attributes": {
"display": "Service Point",
"OBJECTID": 13597
},
"geometry": {
"x": -88.17599727899994,
"y": 41.78465526100007
}
},
{
"attributes": {
"display": "Service Point",
"OBJECTID": 13598
},
"geometry": {
"x": -88.17595382899998,
"y": 41.78455803400004
}
},
{
"attributes": {
"display": "Service Point",
"OBJECTID": 13599
},
"geometry": {
"x": -88.17582231499995,
"y": 41.78435312600004
}
},
{
"attributes": {
"display": "Service Point",
"OBJECTID": 13600
},
"geometry": {
"x": -88.17561004899994,
"y": 41.784005335000074
}
},
{
"attributes": {
"display": "Service Point",
"OBJECTID": 13601
},
"geometry": {
"x": -88.17557576699994,
"y": 41.78393182000008
}
},
{
"attributes": {
"display": "Service Point",
"OBJECTID": 13602
},
"geometry": {
"x": -88.17535967199996,
"y": 41.78352876900004
}
},
{
"attributes": {
"display": "Service Point",
"OBJECTID": 13603
},
"geometry": {
"x": -88.17534426199995,
"y": 41.78340020400003
}
},
{
"attributes": {
"display": "Service Point",
"OBJECTID": 13649
},
"geometry": {
"x": -88.17450698899995,
"y": 41.78350136200004
}
},
{
"attributes": {
"display": "Service Point",
"OBJECTID": 13650
},
"geometry": {
"x": -88.17435162999999,
"y": 41.783597986000075
}
}
]
}
];
transformers=[];
service_points=[];
fuses=[];
data.forEach(function(el) {
el.features.forEach(function(e) {
if(e.attributes.display) {
if(e.attributes.display=='Transformer') {
transformers.push([e.geometry.x,e.geometry.y]);
}
if(e.attributes.display=='Fuses') {
if((e.attributes.display == 'Fuses').length == 0){
console.log("No Data For Fuses");
}else{
fuses.push([e.geometry.x,e.geometry.y]);
}
}
if(e.attributes.display=='Service Point') {
service_points.push([e.geometry.x,e.geometry.y]);
}
}
});
});
console.log(transformers,service_points, fuses);Upvotes: 0
Views: 59
Answers (2)
11thdimension
Reputation: 10633
If you need to check the fuses for each data element it can be done as below
data.forEach(function(el) {
var hasFuses = el.features.some((e) => e.attributes.display === 'Fuses');
console.log('has: ' + hasFuses);
el.features.forEach(function(e) {
if (!hasFuses) {
console.log("No Data For Fuses");
}
switch (e.attributes.display) {
case 'Transformer':
transformers.push([e.geometry.x, e.geometry.y]);
break;
case 'Fuses':
fuses.push([e.geometry.x, e.geometry.y]);
break;
case 'Service Point':
service_points.push([e.geometry.x, e.geometry.y]);
break;
}
});
});
console.log(transformers, service_points, fuses);
Upvotes: 1
user184994
Reputation: 18271
The function below will build up an object of arrays (one for fuses, one for service point, and one for transformer) using reduce, and push the coords in as it goes. When it is done, you can easily check to see if the fuses array .length === 0, and if so, do what you need to
function process() {
data.forEach((el) => {
let arrays = el.features.reduce(function(result, feature) {
if (feature.attributes && feature.attributes.display) {
// Get the display name to use as the key for our object
let key = feature.attributes.display.replace(" ", "")
// Push the coords into the array
result[key].push([feature.geometry.x, feature.geometry.y]);
}
return result;
}, {
// Provide a default object with empty arrays
Transformer: [],
Fuses: [],
ServicePoint: []
});
console.log(arrays);
if (arrays.Fuses.length === 0) {
// Do what you need to here.
console.log("No fuses");
}
});
}
var data = [{
"displayFieldName": "",
"fieldAliases": {
"OBJECTID": "OBJECTID"
},
"fields": [{
"name": "OBJECTID",
"type": "esriFieldTypeOID",
"alias": "OBJECTID"
}],
"features": [{
"attributes": {
"OBJECTID": 649
}
},
{
"attributes": {
"OBJECTID": 665
}
},
{
"attributes": {
"OBJECTID": 762
}
}
]
},
{
"displayFieldName": "",
"fieldAliases": {
"display": "display",
"OBJECTID": "OBJECTID"
},
"geometryType": "esriGeometryPoint",
"spatialReference": {
"wkid": 4326,
"latestWkid": 4326
},
"fields": [{
"name": "display",
"type": "esriFieldTypeString",
"alias": "display",
"length": 50
},
{
"name": "OBJECTID",
"type": "esriFieldTypeOID",
"alias": "OBJECTID"
}
],
"features": [{
"attributes": {
"display": "Transformer",
"OBJECTID": 1537
},
"geometry": {
"x": -88.17602806699995,
"y": 41.78431233100008
}
},
{
"attributes": {
"display": "Transformer",
"OBJECTID": 1591
},
"geometry": {
"x": -88.17546081099994,
"y": 41.783341919000065
}
}
]
},
{
"displayFieldName": "",
"fieldAliases": {
"display": "display",
"OBJECTID": "OBJECTID"
},
"geometryType": "esriGeometryPoint",
"spatialReference": {
"wkid": 4326,
"latestWkid": 4326
},
"fields": [{
"name": "display",
"type": "esriFieldTypeString",
"alias": "display",
"length": 50
},
{
"name": "OBJECTID",
"type": "esriFieldTypeOID",
"alias": "OBJECTID"
}
],
"features": [{
"attributes": {
"display": "Service Point",
"OBJECTID": 13597
},
"geometry": {
"x": -88.17599727899994,
"y": 41.78465526100007
}
},
{
"attributes": {
"display": "Service Point",
"OBJECTID": 13598
},
"geometry": {
"x": -88.17595382899998,
"y": 41.78455803400004
}
},
{
"attributes": {
"display": "Service Point",
"OBJECTID": 13599
},
"geometry": {
"x": -88.17582231499995,
"y": 41.78435312600004
}
},
{
"attributes": {
"display": "Service Point",
"OBJECTID": 13600
},
"geometry": {
"x": -88.17561004899994,
"y": 41.784005335000074
}
},
{
"attributes": {
"display": "Service Point",
"OBJECTID": 13601
},
"geometry": {
"x": -88.17557576699994,
"y": 41.78393182000008
}
},
{
"attributes": {
"display": "Service Point",
"OBJECTID": 13602
},
"geometry": {
"x": -88.17535967199996,
"y": 41.78352876900004
}
},
{
"attributes": {
"display": "Service Point",
"OBJECTID": 13603
},
"geometry": {
"x": -88.17534426199995,
"y": 41.78340020400003
}
},
{
"attributes": {
"display": "Service Point",
"OBJECTID": 13649
},
"geometry": {
"x": -88.17450698899995,
"y": 41.78350136200004
}
},
{
"attributes": {
"display": "Service Point",
"OBJECTID": 13650
},
"geometry": {
"x": -88.17435162999999,
"y": 41.783597986000075
}
}
]
}
];
process();Upvotes: 1
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