Div positioning on the screen - php

Question

I have these two styles that position my div in the footer of my page. What happens is that when you generate the content of the page for php, these div can override the content.
div.panel-foot {
position: absolute;
z-index: 2;
height: 30px;
width: 100%;
bottom: 0;
color: white;
background-color: #333333;
white-space: nowrap;
padding: 5px 100px;
}
div.panel-foot-information {
background-color: rgb(65, 65, 65);
position: absolute;
bottom: 30px;
max-width: none !important;
z-index: 1;
color: white;
font-size: small;
padding-top: 10px;
padding-bottom: 10px;
}
So what I do is when the content is small they stay on radapé ie with position: absolute, and when the content is longer they stay position: relative.
Anyone know a solution to resize content dynamically?

Answer 1

Unlike the other answers so far, I'm going to assume you have images and other things that a real website has, besides text.
I suggest using Javascript (since you've got a jQuery tag). PHP ultimately has no idea how much space the content will take up in the browser, so JS is your best option.
Have a look at my example here. If you remove some of the div content, you will see the footer color changes (because it changes the classname). all you have to do is plug in your own selectors and classnames and you're good to go.
// check the size of your conent div
// assuming it's got an id of "content"
contentHeight = $("#content").height();
// set the threshold that will determine how big is too big
threshold = 300;
// or if you want to make the threshold as big as the window...
// threshold = $(window).height();
// if the content height is greater than the threshold..
if(contentHeight > threshold){
// remove one class and add another
$("#footer").removeClass('green');
$("#footer").addClass('red');
}
// otherwise, do the opposite
else{
$("#footer").removeClass('red');
$("#footer").addClass('green');
}