Javascript Course

The function presented in this page can be used to disable and automatically enable buttons in web page, with JavaScript. After the user clicks on the button, that button is disabled, and its text is changed, then, after 2 seconds, the button is automatically enabled.
- This function receives an Array with the ID of the buttons to which you want to add this effect.

Code of the function:

// function to disable and enable buttons, receives an array with button IDs
// from: https://coursesweb.net/javascript
function disableEnableBtn(ids){
 // traverses the array with IDs
 var nrids = ids.length;
 for(var i=0; i<nrids; i++){
 // registers onclick event to each button
 if(document.getElementById(ids[i])) {
 document.getElementById(ids[i]).onclick = function() {
 this.setAttribute('disabled', 'disabled'); // disables the button by adding the disabled attribute
 this.innerHTML = 'Disabled'; // changes the button text
 var idbtn = this.id; // stores the button ID

 // calls a function after 2 sec. (2000 milliseconds)
 setTimeout(()=>{
 document.getElementById(idbtn).removeAttribute('disabled'); // removes the disabled attribute
 document.getElementById(idbtn).innerHTML = 'Click'; // changes tne button text
 }, 2000 );
 }
 }
 }
}

- Set an array with IDs of the buttons (one or more IDs), then call the disableEnableBtn() function, passing the array as argument. To change the time after which the button is enabled, modify the value of 2000 added in setTimeout(); see also the comments in code.

- Example with two buttons.
<h4>Example automatically Disable and Enable button</h4>
<p>Click on each button and wait 2 seconds.</p>

<button id='btn1'>Click</button> - <button id='btn2'>Click 2</button>
<script>
// function to disable and enable buttons, receives an array with button IDs
// from https://coursesweb.net/javascript
function disableEnableBtn(ids){
 // traverses the array with IDs
 var nrids = ids.length;
 for(var i=0; i<nrids; i++){
 // registers onclick event to each button
 if(document.getElementById(ids[i])) {
 document.getElementById(ids[i]).onclick = function() {
 this.setAttribute('disabled', 'disabled'); // disables the button by adding the disabled attribute
 this.innerHTML = 'Disabled'; // changes the button text
 var idbtn = this.id; // stores the button ID

 // calls a function after 2 sec. (2000 milliseconds)
 setTimeout(()=>{
 document.getElementById(idbtn).removeAttribute('disabled'); // removes the disabled attribute
 document.getElementById(idbtn).innerHTML = 'Click'; // changes tne button text
 }, 2000 );
 }
 }
 }
}

// array with IDs of buttons
var btnid = ['btn1', 'btn2'];

disableEnableBtn(btnid); // calls the function
</script>

Daily Test with Code Example

HTML
CSS
JavaScript
PHP-MySQL
Which type of <input> creates a date input control, such as a pop-up calendar?
type="text" type="date" type="button"
<input type="date" name="set_date" value="2012-10-15" />
Which CSS property adds shadow effects to the text of an element?
font-style color text-shadow
h2 {
  text-shadow: 2px 3px 3px #a0a1fe;
}
Click on the function that adds new elements to the end of an array.
pop() shift() push()
var pags = ["lessons", "courses"];
pags.push("download", "tutorials");
alert(pags[2]);            // download
Which function sorts an array by key, in ascending order, maintaining key to data correlations?
asort() ksort() sort()
$lang =[10=>"PHP", 20=>"JavaScript", "site"=>"coursesweb.net");
ksort($lang);
var_export($lang);     // array ("site"=>"coursesweb.net", 10=>"PHP", 20=>"JavaScript")
Disable button and Enable it after specified time

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