display:none and jquery show/slideDown

css, jquery

Solution

The reason behind this is CSS classes will be specifying the `display: none;` in the first case, but jQuery thinks the element is visible. To handle this, the best way to do is to define a class `.hidden`, which equates to `display: none;` and then assign the class to the `#example`.

.hidden {display: none;}

Then, remove the class `hidden` from the element and hide it using jQuery on document ready.

$(document).ready(function () {
    $(".hidden").hide().removeClass("hidden");
});

And after this, whatever you do using jQuery, works like charm.

Without CSS Classes

$(document).ready(function () {
  $("#trigger").click(function () {
    $("#theDiv").toggle();
    return false;
  });
});

#theDiv {display: none;}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<a href="#" id="trigger">Show / Hide</a>
<div id="theDiv">
  <p>Hello</p>
</div>

Using CSS `hidden` / jQuery Alternative

$(document).ready(function () {
  $(".hidden").hide().removeClass("hidden");
  $("#trigger").click(function () {
    $("#theDiv").toggle();
    return false;
  });
});

.hidden {display: none;}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<a href="#" id="trigger">Show / Hide</a>
<div id="theDiv" class="hidden">
  <p>Hello</p>
</div>

Problem

When using `display:none` in css: ``` #example { display:none; } ``` my content isn't showed with this jQuery function: ``` $('#div1').on('mouseover', function() { $('#example').slideDown(2000); }); ``` But when I use inline style argument `style="display:none"` it works. Can someone explain why?

Original source