How do I make a JSON object produce HTML on the page - json

Question

Here is my JSON
var gal = [
{
"folder":"nu_images",
"pic":"gd_42.jpg",
"boxclass":"pirobox_gall",
"alt":"Rand Poster 1",
"title":"Rand Poster 1",
"thfolder":"th",
"thumbpic":"th_gd_42.jpg"
},
{
"folder":"nu_images",
"pic":"gd_13.jpg",
"boxclass":"pirobox_gall",
"alt":"Explosive Pixel Design",
"title":"Explosive Pixel Design",
"thfolder":"th",
"thumbpic":"th_gd_13.jpg"
}
];
and here is my for loop
for (i = 0; i < gal.length; i++) {
document.getElementById("gallery").innerHTML = "" + "<img src=\"" + "http:\/\/galnova.com\/" + gal[i].folder + "\/" + "th\/" + gal[i].thumbpic + "\"" + "border=\"0\"" + "alt=\"" + gal[i].alt + "\"" + "title=\"" + gal[i].title + "\"\/>" + ""
};
I am trying to make my JSON show all of the objects in HTML one after the other. I can get it to show the first one or whatever number I put into the array but I don't know how to make it generate a list of them.
Here is a link to my jsfiddle. Any help you can offer would be greatly appreciated.
http://jsfiddle.net/o7cuxyhb/10/
It's being generated here <p id="gallery"></p> just not correctly.

Answer 1

You're overwriting your html with every loop iteration:
document.getElementById("gallery").innerHTML = ...
^---
Perhaps you want something more like
document.getElementById("gallery").innerHTML += ...
^---
which will concatenation the original html contents with your new stuff.
And technically, you shouldn't be doing this in a loop. Changing .innerHTML like that causes the document to be reflowed/re-rendered each time you change .innerHTML, which gets very expensive when you do it in a loop. You should be building your html as a plain string, THEN adding it to the dom.
e.g.
var str = '';
foreach(...) {
str += 'new html here';
}
document.getElementById("gallery").innerHTML += str;

Answer 2

for (i = 0; i < gal.length; i++) {
document.getElementById("gallery").innerHTML += "" + "<img src=\"" + "http:\/\/galnova.com\/" + gal[i].folder + "\/" + "th\/" + gal[i].thumbpic + "\"" + "border=\"0\"" + "alt=\"" + gal[i].alt + "\"" + "title=\"" + gal[i].title + "\"\/>" + "" };
Add a += instead of an = after innerHTML

Answer 3

Try this:
function displayJson(jsonArray){
var container = document.getElementById("gallery");
for (var i=0; i<jsonArray.length; i++){
var newElement = document.createElement("a").innerHTML = jsonToHtml(jsonArray[i])
container.appendChild(newElement);
}
}
function jsonToHtml(jsonObj){
//Define your dom object here
var el = document.createElement("a").innerHTML = '' // you code here
...
return el;
}
displayJson(gal);