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

What attribute makes an option from <select> selected?
checked="checked" selected="selected" disabled="disabled"
<select name="a_name">
 <option value="val1">Option 1</option>
 <option value="val2" selected="selected">Option 2</option>
What CSS value allows to create color gradients for background?
contain repeat-x linear-gradient
#id {
  background: linear-gradient(top left, #1f1, #fff, #11f);
What statement creates an array in JavaScript?
[] {} new Object()
var arr = [1, "", ""];
Indicate the PHP function used to redirect to other page.
function() header() switch()
Add Pause in JavaScript script

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