I need help.I need to measure json array length based on key value using Angular.js or Javascript.I am explaining my code below.
[{"day_id":"1","b":"sss"},
{"day_id":"2","b":"ffff"},
{"day_id":"3","b":"ccc"},
{"day_id":"3","b":"hhh"},
{"day_id":"4","b":"kkk"}]
Here i need to measure the length where day_id=3 or 2 etc eans how many set of data present where day_id=3 and here for 3 there are 2 set of data present.Please help me.
You can try this:
var testArr = [{"day_id":"1","b":"sss"},
{"day_id":"2","b":"ffff"},
{"day_id":"3","b":"ccc"},
{"day_id":"3","b":"hhh"},
{"day_id":"4","b":"kkk"}];
function getCount(arr,key,value){
var count = 0;
arr.forEach(function(obj){
if(obj[key] == value){
count++;
}
});
return count;
}
console.log(getCount(testArr,'day_id','3'));
//2
This can help you.
function filterData(data, key, val){
var result = [];
for(var i=0;i< data.length; i++){
if ((data[i][key]) && (data[i][key] == val)) {
result.push(data[i]);
}
}
return result;
}
You can use it as filterData(data, "day_id", 3)
Disclaimer: It can have typos.
You can use the Array.prototype.filter method:
var filtered_array = your_array.filter(function(row) {
return row.day_id = "3"
});
var day_id_count = filtered_array.length
your_array.filter (function (row) { return row.day_id = "3" }).lengthThis solution is using angular.
// data is your array
function MyCtrl($scope, $filter) {
$scope.data = [{
"day_id": "1",
"b": "sss"
}, {
"day_id": "2",
"b": "ffff"
}, {
"day_id": "3",
"b": "ccc"
}, {
"day_id": "3",
"b": "hhh"
}, {
"day_id": "4",
"b": "kkk"
}];
$scope.count = $filter('filter')($scope.data, {
day_id: 1
}).length;
}<!DOCTYPE html>
<html ng-app>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
</head>
<body ng-controller="MyCtrl">
Count: {{count}}
</body>
</html>This is a more generic solution, it takes an object with the property to search for and the value.
It iterates over the array and count if the wanted property hast the same value.
function getCount(array, search) {
var c = 0,
k = Object.keys(search)[0];
array.forEach(function (a) {
a[k] === search[k] && c++;
});
return c;
}
var array = [{ "day_id": "1", "b": "sss" }, { "day_id": "2", "b": "ffff" }, { "day_id": "3", "b": "ccc" }, { "day_id": "3", "b": "hhh" }, { "day_id": "4", "b": "kkk" }];
document.write(getCount(array, { day_id: '2' }) + '<br>');
document.write(getCount(array, { day_id: '3' }) + '<br>');try this.you can use filter function on arrays
var arr = [{
"day_id": "1",
"b": "sss"
}, {
"day_id": "2",
"b": "ffff"
}, {
"day_id": "3",
"b": "ccc"
}, {
"day_id": "3",
"b": "hhh"
}, {
"day_id": "4",
"b": "kkk"
}]
Array.prototype.findCountByPropertyValue=function(property_name,value)
{
return arr.filter(function(i) { return i[property_name] == value}).length
}
document.write(arr.findCountByPropertyValue('day_id',1))
document.write('<br>')
document.write(arr.findCountByPropertyValue('day_id',2))
document.write('<br>')
document.write(arr.findCountByPropertyValue('day_id',3))
document.write('<br>')
document.write(arr.findCountByPropertyValue('day_id',4))
document.write('<br>')
document.write(arr.findCountByPropertyValue('day_id',5))