I have the following array of objects:
[
{
"id": 1,
"name": "Leanne Graham",
"username": "Bret",
"email": "[email protected]",
"phone": "1-770-736-8031 x56442",
"website": "hildegard.org",
},
{
"id": 2,
"name": "Ervin Howell",
"username": "Antonette",
"email": "[email protected]"
"phone": "010-692-6593 x09125",
"website": "anastasia.net"
},...];
I am passed id as 2. I want the index of array of objects where id=2. How can this be done in javascript or jQuery?
Iterate over the obj with Array#forEach function, if actual index is the same as the given id in the arguments, assign it into the objId variable.
If there's no any objects with given id - function will log -1.
let obj = [{id:1,name:"Leanne Graham",username:"Bret",email:"[email protected]",phone:"1-770-736-8031 x56442",website:"hildegard.org"},{id:2,name:"Ervin Howell",username:"Antonette",email:"[email protected]",phone:"010-692-6593 x09125",website:"anastasia.net"}];
function checkId(obj, id) {
let objId = -1;
obj.forEach((v,i) => v.id == id ? objId = i : v);
console.log(objId);
}
checkId(obj, 2);
checkId(obj, 4);Another approach, using Array#find and Array#indexOf.
let obj = [{id:1,name:"Leanne Graham",username:"Bret",email:"[email protected]",phone:"1-770-736-8031 x56442",website:"hildegard.org"},{id:2,name:"Ervin Howell",username:"Antonette",email:"[email protected]",phone:"010-692-6593 x09125",website:"anastasia.net"}];
function checkId(obj, id) {
let objId = obj.indexOf(obj.find((v,i) => v.id == id)) || -1;
console.log(objId);
}
checkId(obj, 2);
checkId(obj, 4);You can do it by using each function:
var json = [
{"id":"1","tagName":"apple"},
{"id":"2","tagName":"orange"},
{"id":"3","tagName":"banana"},
{"id":"4","tagName":"watermelon"},
{"id":"5","tagName":"pineapple"}
];
$.each(json, function(idx, obj) {
if(obj.id == 2){
alert(idx);//will alert index where id = 2
}
});
For more details please visit: https://www.mkyong.com/jquery/jquery-loop-over-json-string-each-example/
This function will return an array of indexes if there is one or more matches:
function getIDs(obj,id) {
var ret = [];
obj.forEach((val,i) => val.id == id ? ret.push(i) : val);
return(ret);
}
var ids = getIDs(object,2);
console.log(ids);
