I'm working on displaying a button only if a JSON object contains the element hidden: true.
The child elements are unpredictable.
draw": { "item": { "aircraft": { "hidden": false} }
draw": { "item": { "mounted": { "hidden": false} }
I am using ng-repeat on this JSON, but since I don't know whether it's aircraft or mounted, I can't do something like this:
<button ng-if="json.draw.item.next.hidden" />
How can I request the next element without knowing its name?
Here is a function that you can use:
function retrieveFirstProperty(obj) {
var keys = Object.keys(obj);
if(keys && keys.length > 0) return obj[keys[0]];
}
To implement it, simply do the following:
retrieveFirstProperty(json.draw.item).hidden
I have tested this function with Angular.js and it works fine. You can also check out the jsFiddle example provided.
Check out the code snippet below for a demonstration:
function retrieveFirstProperty(obj) {
var keys = Object.keys(obj);
if(keys && keys.length > 0) return obj[keys[0]];
}
var draw1 = { "item": { "aircraft": { "hidden": false} }};
var draw2 = { "item": { "mounted": { "hidden": false} }};
document.write(retrieveFirstProperty(draw1.item).hidden, '<br>');
document.write(retrieveFirstProperty(draw2.item).hidden, '<br>');Every time I attempt to perform an operation, I encounter this exception. (TypeError): b.k.g.E is null stack: TBe([object Object]) .... What steps can I take to fix this error? ...
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