getting a key out of a javascript hash
- by mcintyre321
I working with the latest draft of the twitter annotations api. An example bit of data looks like
status {
annotations : [
{myAnnotationType:{myKey:myValue}},
{someoneElsesAnnotationType:{theirKey:theirValue}},
]
}
now i want to check a status to see if it has an annotation with myAnnotationType in it. If annotations was a hash instead of an array I could just write var ann = status.annotations.myAnnotationType. But its not so I wrote this instead:
function getKeys(obj){
var keys = [];
for (key in obj) {
if (obj.hasOwnProperty(key)) { keys[keys.length] = key; }
}
return keys;
}
function getAnnotation(status, type){
for(var i=0;i<status.annotations.length;i++){
var keys = getKeys(status.annotations[i]);
for(var j=0;j<keys.length;j++){
if(keys[j] == type){
return status.annotations[i];
}
}
}
}
var ann = getAnnotation(status, "myAnnotationType");
There must be a better way! Is there?
PS I can't use jquery or anything as this is js to be used in a caja widget and the container doesn't support external libs
