The code presented below can be used to highlight images on page when the user clicks on them then, if the user clicks again on that image, the highlight style is removed.
- The script adds CSS style with JavaScript: "padding", "background", and "border" to the image clicked by the user, when the user clicks again on that image, the highlight effect is removed.

Code of the script:
<script type="text/javascript">
// set image properties, for Highlight effect added when click
var imgProp = {
  'padding': '3px',
  'backgroundColor': '#eded01',
  'borderSize': '1ps',
  'borderStyle': 'dashed',
  'borderColor': '#0001fe'
};

// function to highlight IMGs on click - from: http://coursesweb.net/
function highlightImg() {
  // gets all <img> tags, and their number
  var allimgs = document.getElementsByTagName('img');
  var nrallimgs = allimgs.length;

  // traverses the <img> elements, and register onclick to each one
  // else, apply the properties defined in $imgProp
  for(i=0; i<nrallimgs; i++) {
    allimgs[i].onclick=function() {
      // if borderStyle is already applied, anulates the 'padding', 'background' and 'border' properties
      if(this.style.borderStyle == imgProp.borderStyle) {
        this.style.padding = 'auto';
        this.style.background = 'none';
        this.style.border = 'none';
      }
      else {
        this.style.padding = imgProp.padding;
        this.style.backgroundColor = imgProp.backgroundColor;
        this.style.borderSize = imgProp.borderSize;
        this.style.borderStyle = imgProp.borderStyle;
        this.style.borderColor = imgProp.borderColor;
      }
    }
  }
}

// calls the highlightImg() function to apply the effect
highlightImg();
</script>
- In the imgProp object you can define the highlight style: "padding", "background", and "border" properties.
- The effect is for all the <img> tags in the page; if you want the highlight effect to be applied only to the images added into a specified HTML element, replace this code:
var allimgs = document.getElementsByTagName('img');
With this line of code ('idelm' is the ID of the element in which the images are included).
var allimgs = document.getElementById('idelm').getElementsByTagName('img');
- The JavaScript script must be added at the end of the HTML document, before the ending </body> tag.

• Demo, click on these images.
Robot     Love     Angel

Daily Test with Code Example

HTML
CSS
JavaScript
PHP-MySQL
Which tag adds a new line into a paragraph?
<b> <br> <p>
First line ...<br>
Other line...
Which CSS property can be used to add space between letters?
text-size word-spacing letter-spacing
#id {
  letter-spacing: 2px;
}
What JavaScript function can be used to get access to HTML element with a specified ID?
getElementById() getElementsByTagName() createElement()
var elm = document.getElementById("theID");
var content = elm.innerHTML;
alert(content);
Click on the "echo" correct instruction.
echo "CoursesWeb.net" echo "CoursesWeb.net"; echo ""CoursesWeb.net";
echo "Address URL: http://CoursesWeb.net";
Highlight Images on click

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