jQuery '.each' and attaching '.click' event

I am not a programer but I enjoy building prototypes. All of my experience comes from actionScript2.

Here is my question. To simplify my code I would like to figure out how to attach '.click' events to div's that are already existing in the HTML body.

<body>
<div id="dog-selected">dog</div>
<div id="cat-selected">cat</div>
<div id="mouse-selected">mouse</div>

<div class="dog"><img></div>
<div class="cat"><img></div>
<div class="mouse"><img></div>
</body>

My (failed) strategy was:
1) make an array of objects:

var props = {
"dog": "false",
"cat": "true",
"mouse": "false"
};

2) iterate through the array with '.each' and augment each existing div with a '.click' event. Lastly, construct a local variable.

here is a prototype:

$.each(props, function(key, value) {    
$('#'+key+'-selected').click(function(){
var key = value;  
});
});

One solution you could use is to assign a more generalized class to any div you want the click event handler bound to.

For example:

HTML:

<body>
<div id="dog" class="selected" data-selected="false">dog</div>
<div id="cat" class="selected" data-selected="true">cat</div>
<div id="mouse" class="selected" data-selected="false">mouse</div>

<div class="dog"><img/></div>
<div class="cat"><img/></div>
<div class="mouse"><img/></div>
</body>

JS:

$( ".selected" ).each(function(index) {
    $(this).on("click", function(){
        // For the boolean value
        var boolKey = $(this).data('selected');
        // For the mammal value
        var mammalKey = $(this).attr('id'); 
    });
});

No need to use .each. click already binds to all div occurrences.

$('div').click(function(e) {
    ..    
});

See Demo

Note: use hard binding such as .click to make sure dynamically loaded elements don't get bound.

来源：https://stackoverflow.com/questions/18966222/jquery-each-and-attaching-click-event

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each