api.jquery.com/entries/event.data.xml at 2070dffb0ef6930859210e0e7004a1487e6dfd24 · jquery/api.jquery.com · GitHub

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<entry type='property' name="event.data">
    <signature>
        <added>1.1</added>
    </signature>
    <desc>An optional data map passed to an event method when the current executing handler is bound.  </desc>
    <longdesc>   </longdesc>
<example>
  <desc>Within a <code>for</code> loop, pass the value of <code>i</code> to the <code>.on()</code> method so that the current iteration's value is preserved. </desc>
<html><![CDATA[
<button> 0 </button>
<button> 1 </button>
<button> 2 </button>
<button> 3 </button>
<button> 4 </button>

<div id="log"></div>
]]></html>
<code><![CDATA[
var logDiv = $("#log");

/* Note: This code is for demonstration purposes only. */
for (var i = 0; i < 5; i++) {
  $("button").eq(i).on("click", {value: i}, function(event) {
    var msgs = [
      "button = " + $(this).index(),
      "event.data.value = " + event.data.value,
      "i = " + i
    ];
    logDiv.append( msgs.join(", ") + "<br>" );
  });
}
]]></code>
</example>
</entry>