Float a div above page content

问题

I've implemented a popup box that dynamically displays search options. I want the box to "float" above all of the site content. Currently, when the box is displayed it displaces all of the content below it and looks bad.

I believe I've already tried setting the z-index of the box's div to above that of the remaining page content, but still no luck.

回答1:

You want to use absolute positioning.

An absolute position element is positioned relative to the first parent element that has a position other than static. If no such element is found, the containing block is html

For instance :

.yourDiv{
  position:absolute;
  top: 123px;
}

To get it to work, the parent needs to be relative (position:relative)

In your case this should do the trick:

.suggestionsBox{position:absolute; top:40px;}
#specific_locations_add{position:relative;}

回答2:

Use

position: absolute;
top: ...px;
left: ...px;

To position the div. Make sure it doesn't have a parent tag with position: relative;

回答3:

give z-index:-1 to flash and give z-index:100 to div..

回答4:

Yes, the higher the z-index, the better. It will position your content element on top of every other element on the page. Say you have z-index to some elements on your page. Look for the highest and then give a higher z-index to your popup element. This way it will flow even over the other elements with z-index. If you don't have a z-index in any element on your page, you should give like z-index:2; or something higher.

回答5:

The results container div has position: relative meaning it is still in the document flow and will change the layout of elements around it. You need to use position: absolute to achieve a 'floating' effect.

You should also check the markup you're using, you have phantom <li>s with no container <ul>, you could probably replace both the div#suggestions and div#autoSuggestionsList with a single <ul> and get the desired result.

回答6:

The below code is working,

<style>
    .PanelFloat {
        position: fixed;
        overflow: hidden;
        z-index: 2400;
        opacity: 0.70;
        right: 30px;
        top: 0px !important;
        -webkit-transition: all 0.5s ease-in-out;
        -moz-transition: all 0.5s ease-in-out;
        -ms-transition: all 0.5s ease-in-out;
        -o-transition: all 0.5s ease-in-out;
        transition: all 0.5s ease-in-out;
    }
</style>

<script>
 //The below script will keep the panel float on normal state
 $(function () {
        $(document).on('scroll', function () {
            //Multiplication value shall be changed based on user window
            $('#MyFloatPanel').css('top', 4 * ($(window).scrollTop() / 5));
        });
    });
 //To make the panel float over a bootstrap model which has z-index: 2300, so i specified custom value as 2400
 $(document).on('click', '.btnSearchView', function () {
      $('#MyFloatPanel').addClass('PanelFloat');
  });

  $(document).on('click', '.btnSearchClose', function () {
      $('#MyFloatPanel').removeClass('PanelFloat');
  });
 </script>

 <div class="col-lg-12 col-md-12">
   <div class="col-lg-8 col-md-8" >
    //My scrollable content is here
   </div>
   //This below panel will float while scrolling the above div content
   <div class="col-lg-4 col-md-4" id="MyFloatPanel">
    <div class="row">
     <div class="panel panel-default">
      <div class="panel-heading">Panel Head </div>
     <div class="panel-body ">//Your panel content</div>
   </div>
  </div>
 </div>
</div>

来源：https://stackoverflow.com/questions/2006134/float-a-div-above-page-content

标签

css

z-index