Javascript Course

Working to a JS script, I wanted to add a pause in the execution of the script.
In PHP there is a function sleep() to delay execution of the PHP script, but JavaScript doesn't have such a function.
Looking on the net, I found a solution to delay the execution of some code in JS script, by using the setTimeout() function.

Here's the method, the code that must be executed after pause must be inside a function that will be accessed with setTimeout():

setTimeout( function(){
 // here add the code (or call a function) to be executed after pause
}, 1000 );
- 1000 represents the number of millisecond of the pause (for 2 seconds add 2000).

Example, executing a JS code after a specified time

The following script it writes a text in page (with document.write), then, after a pause of 2.3 seconds it will display an alert dialog window.

//executes some code after a 'pause' (in millisecond)
function testPause(pause){
 // code that must be executed after the pause
 alert('Hi, I came after 2.3 seconds');
 }, pause );

document.write('Hi there, wait');

Here is another example that adds a 'Loading ...' message into an HTML element, than, after 2.5 seconds it adds another content.
<div id='cnt'> </div>

function simLoad(id){
 // display 'Loading ..', and use setTimeout() to access a function after 2.3 seconds
 document.getElementById(id).innerHTML = '<h4>Loading ...</h4>';

 setTimeout(()=>{ adContent(id); }, 2500);

 /* in this case setTimeout() can be used also like this
 setTimeout('adContent(''+id+'')', 2500);

// this function adds a content inside a HTML element, with the ID passed in parameter
function adContent(id){
 document.getElementById(id).innerHTML ='JavaScript Tutorial - <em>Pause the script in JS</em> - <a href='//' title='JavaScript Course'>JavaScript Course</a>';

simLoad('cnt'); // access simLoad() with the ID of HTML tag

Daily Test with Code Example

Which tag is a block element?
<div> <img> <span>
<div>Web Programming and Development</div>
Which CSS code displays the text underlined?
font-style: italic; text-decoration: underline; font-weight: 500;
h2 {
  text-decoration: underline;
Click on the JavaScript function that can access other function after a specified time.
insertBefore() setTimeout() querySelector()
function someFunction() { alert(""); }
setTimeout("someFunction()", 2000);
Click on the instruction that returns the number of items of a multidimensional array in PHP.
count($array) count($array, 1) strlen()
$food =["fruits" =>["banana", "apple"), "veggie" =>["collard", "pea"));
$nr_food = count($food, 1);
echo $nr_food;       // 6
Add Pause in JavaScript script

Last accessed pages

  1. Integer and Float value in Select with PDO from string to numeric (7373)
  2. Get the value of the selected /checked checkboxes in a form (43639)
  3. GraidleChart Create Graphic Charts (1620)
  4. PHP-MySQL Scripts (6285)
  5. Create a simple anti-spam Captcha verification code (1928)

Popular pages this month

  1. Courses Web: PHP-MySQL JavaScript Node.js Ajax HTML CSS (738)
  2. SHA256 Encrypt hash in JavaScript (672)
  3. PHP Unzipper - Extract Zip, Rar Archives (642)
  4. Read Excel file data in PHP - PhpExcelReader (640)
  5. Create simple Website with PHP (631)