The javascript prompt() is a method of the window object, just like alert() or confirm().

The point of the JavaScript prompt is to get information from the user before entering a page so that the information can be used throughout the site to give the visitor a personalized feel.

When a prompt box pops up, the user will have to click either “OK” or “Cancel” to proceed after entering an input value in the text field. JavaScript lets you specify a default value for this text field.

prompt(”Question”, “default value in the text field”);

If the user clicks “OK” the box returns the input value. If the user clicks “Cancel” the box returns null. The information submitted by the visitor from prompt() can be stored in a variable.

The JavaScript alert() is a method of the window object. It is a dialogue box that pops up and takes the focus away from the current window and forces the web browser to read the message. The user will have to click “OK” to proceed.

<script language=”javascript” type=”text/javascript”>
alert(’This is an alert message’);
</script>

The text placed inside the parenthesis is displayed on the pop-up box. If you want to show a string of literal text, enclose the text in quotes. To display variable values, enter the variable name without quotes. You can also combine variable values and text strings by using the + sign.

To write text on multiple lines in an alert box we use the new line escape character (\n).

If you mean to pops up a dialogue box asking for confirmation use confirm() instead.

Include and require are both used to insert the content of one PHP file into another PHP file. These two functions are identical. What makes the difference is the way they handle errors.

If an error occurs, the include() function generates a warning, but the script will continue execution. The require() generates a fatal error, and the script will stop. That is why it is recommended to use the require() function instead of include().