Is there a way to duplicate the background-style:contain effect on an image?

Question

Is there a way to duplicate the background-style:contain effect on an image?

It is important to note that the image source must be declared in the HTML code as it will be dynamic, and therefore background cannot be used here.

HTML

<div class='some-form'>
  <form>
    <button>...<button>
    <img id="some-img" src="something"/>
    <input id="some-input"/>
  </form>
</div>

CSS

.some-form { 
  display: block; 
  position: relative; 
}
.some-form #some-input { 
  background-color: rgba(255,255,255,0); 
  border: 1px solid #2F2F2F; 
  width: 300px; 
  color: #000; 
  opacity: 1; 
}
.some-form #some-img { 
  position:absolute; 
  background-color: #FFF; 
  z-index: -1;
  //background-size: contain; //this does not work
  //background-position: center right 50px; //so this will not work
}

In what way can I adjust the image to behave like "contain" so that I can align it as desired?

html css

Answer 1

Answer №1

To maintain your code structure, simply update the #some-img element from an img to a div, ensuring to set the width and height based on the image dimensions. Unfortunately, transforming an img element to mimic the behavior of background-size and background-position properties is not straightforward, as img elements do not function as backgrounds. Therefore, the solution is to convert the image into a div with a background-image.

Since the image source is populated dynamically, employing inline styles to define the background-image on the div allows you to include a PHP or server-side function to output the image URL (which cannot be done within a CSS file).

For instance, retain your existing CSS rules (while incorporating necessary height/width adjustments or other styles to the #some-img div) and replace

<img id="some-img" src="something"/>

with something similar to the following:

<div style="background-image: url(<?php theDynamicImageURL(); ?>);"></div>

or its equivalent in your chosen programming language or method for dynamic image population.

Although utilizing inline CSS should generally be minimized, it serves its purpose well in this scenario. While there are more optimal approaches available, using inline CSS here is acceptable and functional without introducing major drawbacks or requiring extensive effort.

Answer 2

To maintain your code structure, simply update the #some-img element from an img to a div, ensuring to set the width and height based on the image dimensions. Unfortunately, transforming an img element to mimic the behavior of background-size and background-position properties is not straightforward, as img elements do not function as backgrounds. Therefore, the solution is to convert the image into a div with a background-image.

Since the image source is populated dynamically, employing inline styles to define the background-image on the div allows you to include a PHP or server-side function to output the image URL (which cannot be done within a CSS file).

For instance, retain your existing CSS rules (while incorporating necessary height/width adjustments or other styles to the #some-img div) and replace

<img id="some-img" src="something"/>

with something similar to the following:

<div style="background-image: url(<?php theDynamicImageURL(); ?>);"></div>

or its equivalent in your chosen programming language or method for dynamic image population.

Although utilizing inline CSS should generally be minimized, it serves its purpose well in this scenario. While there are more optimal approaches available, using inline CSS here is acceptable and functional without introducing major drawbacks or requiring extensive effort.

Answer 3

Answer №2

To achieve this effect, you can utilize jQuery to create a script that manipulates the image in the following way:

<script type="text/javascript">
  height = $('#some-img').height();
  width = $('#some-img').width();
  src = $('#some-img').attr('src');
  $('#sime-img').wrap('<div id="contain"></div>');
  $('#contain').height(height).width(width);
  $('#contain').css('background',"url('" + src + "')");
  $('#contain').css('background-sizing','contain');
  $('#some-img').css('opacity','0');
</script>

While using jQuery is not necessary, it provides convenience for achieving the desired outcome.

Answer 4

To achieve this effect, you can utilize jQuery to create a script that manipulates the image in the following way:

<script type="text/javascript">
  height = $('#some-img').height();
  width = $('#some-img').width();
  src = $('#some-img').attr('src');
  $('#sime-img').wrap('<div id="contain"></div>');
  $('#contain').height(height).width(width);
  $('#contain').css('background',"url('" + src + "')");
  $('#contain').css('background-sizing','contain');
  $('#some-img').css('opacity','0');
</script>

While using jQuery is not necessary, it provides convenience for achieving the desired outcome.

Answer 5

Answer №3

If you're trying to make an image fit within its container and center it both vertically and horizontally, this code snippet should help.

Although the image will only scale up to its original size, not larger.

HTML

<div class='some-form'>
  <form>
      <button></button>
        <img id="some-img" src="http://lorempixel.com/300/200/sports"/>
      <input id="some-input" />
  </form>
</div>

CSS

.some-form { 
    display: block; 
    position: relative; 
    width:400px;
    height:180px;
    background: rgba(255,255,0,.1); /* for checking that it fits*/
}
.some-form #some-input { 
    background-color: rgba(255,255,255,0); 
    border: 1px solid #2F2F2F; 
    width: 300px; 
    color: #000; 
    opacity: 1; 
}
.some-form #some-img { 
    position:absolute;
    background-color: #FFF; 
    top:0;
    bottom:0;
    left:0;
    right:0;
    margin:auto auto;
    max-width:100%;
    max-height:100%;
    z-index: -1;
}

fiddle: http://jsfiddle.net/XNR38/

Best of luck!

Answer 6

If you're trying to make an image fit within its container and center it both vertically and horizontally, this code snippet should help.

Although the image will only scale up to its original size, not larger.

HTML

<div class='some-form'>
  <form>
      <button></button>
        <img id="some-img" src="http://lorempixel.com/300/200/sports"/>
      <input id="some-input" />
  </form>
</div>

CSS

.some-form { 
    display: block; 
    position: relative; 
    width:400px;
    height:180px;
    background: rgba(255,255,0,.1); /* for checking that it fits*/
}
.some-form #some-input { 
    background-color: rgba(255,255,255,0); 
    border: 1px solid #2F2F2F; 
    width: 300px; 
    color: #000; 
    opacity: 1; 
}
.some-form #some-img { 
    position:absolute;
    background-color: #FFF; 
    top:0;
    bottom:0;
    left:0;
    right:0;
    margin:auto auto;
    max-width:100%;
    max-height:100%;
    z-index: -1;
}

fiddle: http://jsfiddle.net/XNR38/

Best of luck!

Is there a way to duplicate the background-style:contain effect on an image?

Answer №1

Answer №2

Answer №3

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