get object name dynamically with javascript

Question

I have several json objects returned from a ajax call as:

...
main: [{
 0: { // i'm showing only one... have severals
    IMGNAM0: "856f070054d378fa5681332095257c3c94d5f858.jpg"
    IMGNAM1: "68dfda9de984e914b7027c4a3cda51fb375dd828.jpg"
    IMGNAM2: "da0a1a3f68af208baca5eae23900548b40adfbef.jpg"
    IMGNAM3: "c8b540f8bdfe054e3c888e800b380dd60a4ac371.jpg"
    IMGNAM4: "565eb06485c51123786a88b8d5537c6b45add950.jpg"
    IMGPAT0: "./static/uploaded_images/1/"
    IMGPAT1: "./static/uploaded_images/1/"
    IMGPAT2: "./static/uploaded_images/1/"
    IMGPAT3: "./static/uploaded_images/1/"
    IMGPAT4: "./static/uploaded_images/1/"
 }
}]
...

so, i need to get this obj names dynamically, i make a fast preview with something that i'm trying to do:

var mainlen = data.main.length-1; // get number of obj
for(var i = 0; i <= mainlen; i++){
   for(var j = 0; j <= 4; j++){ // examples to get all 4 obj names
        if(data.main[i].IMGNAM+j != null){
             // trying to get IMGNAM0 concatenate with j
             console.log(data.main[i].IMGNAM+j); 
             console.log(data.main[i].IMGPAT+j);
        }
   }
}

console shows me as not a number (NaN), What is the best way to make this work ?

Ah, didn't even notice the different name. Doesn't matter though, you use a for...in loop to iterate over the property names of an object. — Felix Kling
– Felix Kling, Commented Mar 8, 2013 at 12:25

alestanis · Accepted Answer · 2013-03-08 12:14:29Z

1

Instead of using a point to acces to the data, with .IMGNAM+j, use [IMGNAM+j].

answered Mar 8, 2013 at 12:14

alestanis

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Comments

Th3Nic3Guy · Accepted Answer · 2013-03-08 12:16:50Z

0

Use the code as below:

var mainlen = data.main.length-1; // get number of obj
for(var i = 0; i <= mainlen; i++){
   for(var j = 0; j <= 4; j++){ // examples to get all 4 obj names
        if(data.morrows[i].['IMGNAM'+j] != null){
             // trying to get IMGNAM0 concatenate with j
             console.log(data.main[i].['IMGNAM'+j]); 
             console.log(data.main[i].['IMGPAT'+j]);
        }
   }
}

this should solve your problem

answered Mar 8, 2013 at 12:16

Th3Nic3Guy

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2 Comments

Felix Kling Over a year ago

data.main[i].['IMGNAM'+j] should be data.main[i]['IMGNAM'+j].

Ricardo Binns Over a year ago

change the if to data.main .

ZER0 · Accepted Answer · 2013-03-08 12:17:11Z

0

You need something like:

 data.morrows[i]["IMGNAM" + j];

answered Mar 8, 2013 at 12:17

ZER0

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Comments

dragonfire · Accepted Answer · 2015-07-08 23:03:30Z

0

Use square brackets to wrap your concatenated string:

if(data.main[i]['IMAGNAM'+j] != null){

edited Jul 8, 2015 at 23:03

dragonfire

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answered Mar 8, 2013 at 12:21

kevmc

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