Labels and inputs are associated with for, id attribute.
<label for="input-1" class="label-1">label 1 for input 1</label>
<input id="input-1" type="text" value="this is input-1" class="input-1">
Bind click event listeners to both label and input.
var label1 = document.querySelector('.label-1'),
input1 = document.querySelector('.input-1'),
listenClickEvent = function (dom, callback) {
dom.addEventListener('click', callback, false);
};
listenClickEvent(label1, function (e) {
console.log('label-1 clicked');
});
listenClickEvent(input1, function (e) {
console.log('input-1 clicked');
});
A click on label will trigger events on both label and input!
Try it here.