What strategies can be utilized to raise the max-height from the bottom to the top?

Question

What strategies can be utilized to raise the max-height from the bottom to the top?

I am facing the following coding challenge:

<div id = "parent">
    <div id = "button"></div>
</div>

There is also a dynamically generated

<div id="list"></div>

I have successfully implemented this functionality:

$("#button").on("clicked",function(){   
    $("#parent").append(list)
    $("#parent").animate({ "max-height": '300px' }, 500)
}

This code allows me to show the list div from the button's bottom and animate it as if dropping from top to bottom.
However, I now need a different approach that functions like this:

$("#button").on("clicked",function(){  
    $("#parent").prepend(list)
    $("#parent").animate({ "max-height": '300px' }, 500)
}

The above code is not ideal because as the height increases, the div continues to drop down rather than rise up.

Could anyone suggest a solution for making the parent div's height rise up? Any help would be greatly appreciated!

javascript html jquery css

Answer 1

Answer №1

By applying a simple solution, I managed to tackle this seemingly trivial issue by setting the bottom property to 0. Here's how it works: if you have

<div id="big_div">
    <div id="small_div"></div>
</div>

and with the following CSS:

#big_div{
   position:relative;
}
#small_div{
   position:absolute;
   bottom:0px;
   height:0px;
}

When you execute

$("#small_div").animate({"height":"100px"})

, the child div will expand from the bottom to the top because of its bottom positioning, causing it to only move upwards as it grows in height.

In my scenario, the big_div acts as the container and the small_div serves as the parent_div. I enforce a limitation on the parent_div with max-height:20px, equivalent to the size of my button_div. Each time I dynamically generate lists using

$("#parent_div").append(list_div)

or

$("#parent_div").prepend(list_div)

,

And then, when I want to expand the list_div downwards, I employ:

$("#parent_div").css({
    "bottom":"auto",
    "top":the_position_i_need_top,
    "max-height":button_height+list_height
})
$("#button_div").css("top","0px")
$("#parent_div").append(list_div)
$("#list_div").animate({"height",list_height},1000)

When I wish for my list to rise up from the top of the button:

$("#parent_div").css({
    "bottom":the_position_i_need_but_bottom,
    "top":"auto",
    "max-height":button_height+list_height
 })
 $("#button_div").css("bottom","0px")
 $("#parent_div").prepend(list_div)
 $("#list_div").animate({"height",list_height},1000)

The CSS structure is as follows:

#parent{
     width:100px;
     max-height:20px;
     overflow:hidden;
 }
 
 #package_use_targetsContainer{
     height:0px;
 }
 
 #package_use_top{
     position:relative;
 }

This may not be an ideal solution, prompting me to ponder if there exists a more efficient way to resolve this issue.

Answer 2

By applying a simple solution, I managed to tackle this seemingly trivial issue by setting the bottom property to 0. Here's how it works: if you have

<div id="big_div">
    <div id="small_div"></div>
</div>

and with the following CSS:

#big_div{
   position:relative;
}
#small_div{
   position:absolute;
   bottom:0px;
   height:0px;
}

When you execute

$("#small_div").animate({"height":"100px"})

, the child div will expand from the bottom to the top because of its bottom positioning, causing it to only move upwards as it grows in height.

In my scenario, the big_div acts as the container and the small_div serves as the parent_div. I enforce a limitation on the parent_div with max-height:20px, equivalent to the size of my button_div. Each time I dynamically generate lists using

$("#parent_div").append(list_div)

or

$("#parent_div").prepend(list_div)

,

And then, when I want to expand the list_div downwards, I employ:

$("#parent_div").css({
    "bottom":"auto",
    "top":the_position_i_need_top,
    "max-height":button_height+list_height
})
$("#button_div").css("top","0px")
$("#parent_div").append(list_div)
$("#list_div").animate({"height",list_height},1000)

When I wish for my list to rise up from the top of the button:

$("#parent_div").css({
    "bottom":the_position_i_need_but_bottom,
    "top":"auto",
    "max-height":button_height+list_height
 })
 $("#button_div").css("bottom","0px")
 $("#parent_div").prepend(list_div)
 $("#list_div").animate({"height",list_height},1000)

The CSS structure is as follows:

#parent{
     width:100px;
     max-height:20px;
     overflow:hidden;
 }
 
 #package_use_targetsContainer{
     height:0px;
 }
 
 #package_use_top{
     position:relative;
 }

This may not be an ideal solution, prompting me to ponder if there exists a more efficient way to resolve this issue.

What strategies can be utilized to raise the max-height from the bottom to the top?

Answer №1

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