Question

This may be a fairly simple question but it’s just not working for me no matter how many times I change the for loop around. So how would you loop through this array using a for loop in JavaScript?

var fielditems =[
     [["News Tips"],["Opinions"],["MedMinutes"]],
     [["Yes"],["No"],["Maybe"]],
     [["How"],["Why"],["When"]]
];

This is what I have and it’s not working. I used an alert to just test out the result but it’s not even returning anything.

for(itemSet in fielditems){
    var itemSetValues = fielditems[itemSet];
    for(set in itemSetValues){
        var itemValue = itemSetValues[set];
        for(value in itemvalue){
            alert(itemValue[value]);
        }
    }
}

What am I doing wrong?

Answer 1

Don’t use for() with in for arrays. It’s for object properties. Use the standard format instead.

Demo: http://jsfiddle.net/ThinkingStiff/EVWch/

Script:

var fielditems =[
        [["News Tips"],["Opinions"],["MedMinutes"]],
        [["Yes"],["No"],["Maybe"]],
        [["How"],["Why"],["When"]]
    ];

for( var itemIndex = 0; itemIndex < fielditems.length; itemIndex++ ){
    var itemSetValues = fielditems[itemIndex];
    for(var setIndex = 0; setIndex < itemSetValues.length; setIndex++ ){
        var itemValue = itemSetValues[setIndex];
        for(var valueIndex = 0; valueIndex < itemValue.length; valueIndex++ ){
            alert(itemValue[valueIndex]);
        };
    };
};

​