Javascript do something before alert

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8 Answers

alertsomethingjavascript
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Wrap the alert in a timeout,I cannot change the color at the same time with an alert.,I want to change the color and alert a message when a button is clicked.,Science Fiction & Fantasy

function colorChange() {
   document.getElementById('word').style.color = "red";
   setTimeout(function() {
      alert("color changed!");
   }, 10)
}
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In this lesson, you will use JavaScript to display an alert after the web page has loaded. ,Add the following JavaScript code to the <head> section of your web page:,Each of the activities in this module will involve writing JavaScript code. You will start by writing a simple script, then gradually build upon that script, adding more functionality to it in subsequent lessons.,At the completion of this exercise, you will have learned:

Add the following JavaScript code to the <head> section of your web page:

  <script>
  function showAlert() {
    alert ("Hello world!");
  }
  </script>
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An alert message can simply be shown when the HTML file runs, before the user accesses any other elements on the page. The example below shows how to do this.,Sometimes when you require certain fields in a google form you can add alerts if the user tries to submit the form, leaving that field empty.,In the above snippet, the alert method is called in the head section of the HTML file as this allows the message to be shown before the rest of the page is visible. Note that without a button, the alert code is written within the <script> tags.,As you can see in the below code, from line 4 to 8, we can even put alert messages in methods and call them when needed. This way the same message can be shown in multiple places without having to re-write the code.

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I learned an important lesson that day: JavaScript alerts are AMAZING!. ,Don't use a JavaScript alert if you can avoid it.,We see that you have already chosen to receive marketing materials from us. If you wish to change this at any time you may do so by clicking here.,Subscribe to be the first to get our expert-written articles and tutorials for developers!

JavaScript Hello World

alert("Hello World!");
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The JavaScript alert box is useful for alerting your users to something important. When a JavaScript alert box is triggered, a small box will pop up and display the text that you specify in your JavaScript code.,You create a JavaScript alert box by calling the built-in JavaScript alert() function. All you need to do is pass your message to this function. ,In the above example, if you choose anything but Home, you'll see a JavaScript alert.,The most common use for the JavaScript alert is to call it from within a function that does something else. The alert simply draws the user's attention to something that the function has done (or detected).

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<script type="text/javascript">
 window.onbeforeunload = function () {
  return 'Are you really want to perform the action?';
 }
</script>
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Using the alert JavaScript plugin, it’s possible to dismiss any alert inline. Here’s how:,Enable dismissal of an alert via JavaScript:,Be sure you’ve loaded the alert plugin, or the compiled Bootstrap JavaScript.,Bootstrap’s alert plugin exposes a few events for hooking into alert functionality.

<div class="alert alert-primary" role="alert">
   This is a primary alert—check it out!
</div>
<div class="alert alert-secondary" role="alert">
   This is a secondary alert—check it out!
</div>
<div class="alert alert-success" role="alert">
   This is a success alert—check it out!
</div>
<div class="alert alert-danger" role="alert">
   This is a danger alert—check it out!
</div>
<div class="alert alert-warning" role="alert">
   This is a warning alert—check it out!
</div>
<div class="alert alert-info" role="alert">
   This is a info alert—check it out!
</div>
<div class="alert alert-light" role="alert">
   This is a light alert—check it out!
</div>
<div class="alert alert-dark" role="alert">
   This is a dark alert—check it out!
</div>
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The alert dialog should be used for messages which do not require any response on the part of the user, other than the acknowledgement of the message. ,window.alert() instructs the browser to display a dialog with an optional message, and to wait until the user dismisses the dialog.,Under some conditions — for example, when the user switches tabs — the browser may not actually display a dialog, or may not wait for the user to dismiss the dialog., A string you want to display in the alert dialog, or, alternatively, an object that is converted into a string and displayed.

window.alert(message);
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