loadJson
Asynchronously loads the given URL as JSON. Returns a promise that will resolve to a JSON object once loaded, or reject if the URL failed to load. The data is loaded using XMLHttpRequest, which means that in order to make requests to another origin, the server must have Cross-Origin Resource Sharing (CORS) headers enabled. This function always adds 'Accept: application/json' to the request headers.
Parameters:
| Name | Type | Argument | Description |
|---|---|---|---|
url |
String | Promise | The URL to request, or a promise for the URL. | |
headers |
Object |
<optional> |
HTTP headers to send with the request. 'Accept: application/json' is added to the request headers automatically and does not need to be specified. |
Throws:
DeveloperError
: url is required.
Returns:
Promise
a promise that will resolve to the requested data when loaded.
Example
loadJson('http://someUrl.com/someJson.txt').then(function(jsonData) {
//Do something with the JSON object
}, function() {
// an error occurred
});