getJsonSubset function()

getJsonSubset

by Bryson Murray

HTML

<div id="banner-message">
  <p>Hello World</p>
  <button>Change color</button>
</div>

CSS

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#banner-message {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  font-size: 25px;
  text-align: center;
  transition: all 0.2s;
  margin: 0 auto;
  width: 300px;
}

button {
  background: #0084ff;
  border: none;
  border-radius: 5px;
  padding: 8px 14px;
  font-size: 15px;
  color: #fff;
}

#banner-message.alt {
  background: #0084ff;
  color: #fff;
  margin-top: 40px;
  width: 200px;
}

#banner-message.alt button {
  background: #fff;
  color: #000;
}

JavaScript

// find elements
var banner = $("#banner-message")
var button = $("button")

// handle click and add class
button.on("click", function(){
  banner.addClass("alt")
})

function getJsonSubset(obj, keys) {
	var jsonSubset = {};
	if(Array.isArray(keys)){
		for(i in keys){
			var key = keys[i];
			if (!obj.hasOwnProperty(key)){
				throw new Error("Invalid key - "+key);
			}
			jsonSubset[key] = obj[key];
		}
		return jsonSubset;
	}
	else{
		return getJsonKeyValuePair(obj,keys);
	}
}

function getJsonKeyValuePair(obj,key){
	if (obj.hasOwnProperty(key)){
		var jsonSubset = {};
		jsonSubset[key] = obj[key];
		return jsonSubset;
	}
	throw new Error("Invalid key - "+key);
}