I've searched and found a few similar-but-not-quite answers.
I have an array SongList
(showing 2 items for brevity...) - the first pair is a key, the second pair is some JSON.
SongList={
song_1:{title:"title of first song",artist:"the artist",mp3:"http://mysite/song1.mp3"},
song_2:{title:"title of second song",artist:"the artist",mp3:"http://mysite/song2mp3"}
...
};
I would like to be able to retrieve the key ( song_1
or song_2
) given the title
in the value.
I will be looping through a temporary array of i
items, each item in this array would have a match in SongList
and I would save the key ( song_1
, song_2
) in a final array.
You don't have an array, you have an object, containing more objects. Use for in
function findTitle(title) {
for (var key in SongList) {
if (SongList[key].title == title) return key;
}
return false;
}
And then call it!
findTitle("title of first song"); //returns "song_1"
findTitle("BNOT MEEEEEE"); //returns false
Here is an example.
var one = {
a: {b:"MightyMouse", d:2},
b: {b:"MickeyMouse", d:4},
c: {b:"Superman", d:6}
};
for (outerkey in one) {
if (one[outerkey].b === "Superman") {
console.log ("Outerkey = " + outerkey);
}
}
Assuming you are looking for Superman
, this prints as expected c
.
Thanks everyone, I realize my understanding of Arrays v. Objects was an issue which obviously hindered my Google-Fu. I hope it's ok to post the answer I finally arrived at via guidance here:
(SongList object is described in question above)
This is the eventual function I arrived at for saving the keys of the playlist SongList:
$("#save_playlist_as_keys").click(function() {
var keys = []
for(var i=0; i<myPlaylist.playlist.length; i++){
var playItem = (myPlaylist.playlist[i].title); //this returns the names of the tracks
for (var k in SongList){
if(SongList[k].title == playItem) keys.push(k);//this matches track name to keys
}
}
localStorage.setItem('storedKeys',keys);
});
This seems to be doing what I want for now.
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