I have the following JSON array of objects :
"employees":[
{"firstName":"John", "lastName":"Doe"},
{"firstName":"Anna", "lastName":"Smith"},
{"firstName":"Peter","lastName":"Jones"}
]
and i want to get a specific key in JSON array :
for (var ke in employees) {
if (employees.hasOwnProperty(ke)) {
console.log(employees[ke].lastName);
};
but it does not work !!
You're missing a closing curly bracket at the end of your for loop, it should be:
for (var ke in employees) {
if (employees.hasOwnProperty(ke)) {
console.log(employees[ke].lastName);
};
}
However, you could use angular.forEach instead, like this:
angular.forEach(employees, function (ke) {
if(ke.lastName) {
console.log(ke.lastName);
}
});
When traversing through Javascript arrays, use the standard for loop rather than for...in.
for (var i=0; i < employees.length; i+=1) {
console.log(employees[i].lastname);
}
Alternatively, ES5 now provides an Array.forEach function that could be used as well.
employees.forEach( function (employee) {
console.log(employee.lastname);
}
try this
for (var index in employees) {
var tp = employees[index];
console.log(tp['yourkeyhere']);
}
Change your code to the following. It works correctly.
employees=[
{"firstName":"John", "lastName":"Doe"},
{"firstName":"Anna", "lastName":"Smith"},
{"firstName":"Peter","lastName":"Jones"}
]
for(var ke in employees) {
if (employees.hasOwnProperty(ke)) {
console.log(employees[ke].lastName);
};
}
Approach: 1 - With more validation.
var employees= [
{"firstName":"John", "lastName":"Doe"},
{"firstName":"Anna", "lastName":"Smith"},
{"firstName":"Peter","lastName":"Jones"}
];
for(var obj in employees) {
if(employees.hasOwnProperty(obj)){
for(var prop in employees[obj]){
if(employees[obj].hasOwnProperty(prop)){
alert(prop + ' : ' + employees[obj][prop]);
//to change the key's value
if(employees[obj][prop] == 'Smith'){
employees[obj][prop]='Mike';
}
}
}
}
}
Approach: 2 Without validation (not recommended)
for(i in employees) {
var obj = employees[i];
for(j in obj) {
var key = j;
var val = obj[j];
alert(key + " : " + val);
}
}
Edit:
var employees={"firstName":"John", "lastName":"Doe"};
Object.keys(employees); // return ["firstName", "lastName"]
Object has a prototype keys, returns an Array of keys in an Object
Chrome, FF & Safari supports Object.keys
