如何使条形图从下到上动画化？

Question

I am trying to make a bar chart and the bar animates from top to bottom right now, but I want it to animate from bottom to top. How do I get it go from bottom to top?

CSS

.bar {
width:50px;
height:250px;
list-style-type:none;
}
.bar p {
background-color:#63F;
}
.bar span { 
padding-left:15px;
left:100%;  
}
#content ul {
list-style-type:none;
}
#content ul li {
float:left;
margin:50px;
}

HTML

<div id="content">
<ul>
  <li>
    <div class="bar">
      <p><span>50%</span></p>
    </div><br>
    Freshmen                    
  </li>
</ul>
</content>

Javascript

<script src="../../jquery-1.6.4.min.js"></script>    
$(document).ready(function(){
    $(".bar").each(function(){
        var length = $(this).find("span").html();
        $(this).find("p").delay(500).animate({'height':length},3500,function(){$(this).find("span").fadeIn(1000);
        });
    });
});

"click here to see it in jsfiddle"

Answer 1

You can define position:absolute to your bar . Write like this:

.bar {
width:50px;
height:250px;
list-style-type:none;
    position:relative;
}
.bar p {
background-color:#63F;
    position:absolute;
    bottom:0;
    left:0;
}

Check this http://jsfiddle.net/6zqSS/1/

Answer 2

http://jsfiddle.net/t4THf/5/

CSS

.perfect
{
    padding-top:30px;
    width:500px;
    height:300px;
    position:relative;
    background-color:#efefef;
}
.perfect .bar
{
    float:left;
    position:relative;
    width:40px;
    height:100%;
    margin-left:5px;
}
.perfect .bar .slideup
{
    position:absolute;
    bottom:0px;
    width:40px;
    background-color:#fff000;
    border:1px solid #000;
}
.perfect .bar .slideup span
{
    display:block;
    position:absolute;
    margin:5px;
    top:-30px;
}

HTML

<div class="perfect">
    <div class="bar">
        <div class="slideup">
            <span>20%</span>
        </div>
    </div>
    <div class="bar">
        <div class="slideup">
            <span>30%</span>
        </div>
    </div>
    <div class="bar">
        <div class="slideup">
            <span>10%</span>
        </div>
    </div>
    <div class="bar">
        <div class="slideup">
            <span>70%</span>
        </div>
    </div>
    <div class="bar">
        <div class="slideup">
            <span>100%</span>
        </div>
    </div>
    <div class="bar">
        <div class="slideup">
            <span>50%</span>
        </div>
    </div>
    <div class="bar">
        <div class="slideup">
            <span>60%</span>
        </div>
    </div>
    <div class="bar">
        <div class="slideup">
            <span>55%</span>
        </div>
    </div>
    <div class="bar">
        <div class="slideup">
            <span>70%</span>
        </div>
    </div>
    <div class="bar">
        <div class="slideup">
            <span>70%</span>
        </div>
    </div>
</div>

JS

$(function(){
     $(".bar").each(function(){
        var length = $(this).find("span").html();
        $(this).find(".slideup").delay(500).animate({'height':length},
"slow",function(){$(this).find("span").fadeIn(1000);
        });
    });
});

Click here for demo

Answer 3

You could also achieve this using css keyframes, for example for webkit http://jsfiddle.net/kudoslabs/YddaY/

css

dl{ position: relative ; height: 200px ; }
dt,dd{ position: absolute ; }
dd{ height: 70% ; width: 30px ; background: grey ; bottom: 20px ; -webkit-animation: animate-bar 1.25s 1 linear; }
dt{ bottom: 0 ; }
@-webkit-keyframes animate-bar{
    0% {height: 0% ; }
}​

html

<dl>
    <dt>Freshman</dt>    
    <dd>70%</dd>
</dl>​

Answer 4

http://jsfiddle.net/chovy/6zqSS/2/

.bar {
    position: relative;
}


.bar p {
    position: absolute;
    bottom: 0;
}

Answer 5

Use keyframes to animate the css property, eg width Once you set the width of your element (eg div) the animation will kick in

.animated-bar {
  animation: animateBar 0.25s ease-in;
  @keyframes animateBar {
    0% {
      width: 0;
    }
  }
}

<div class="animated-bar" style="width: 200px"><div>