Javascript JavaScript is what is called a client-side scripting language: a programming language...
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Javascript JavaScript is what is called a client- side scripting language: a programming language that runs inside an Internet browser (a browser is also known as a Web client because it connects to a Web server to download pages) Inside a normal Web page you place some JavaScript code. When the browser loads the page, the browser has a built-in interpreter that reads the JavaScript code it finds in the page and runs it.
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Simple Calculator (1) The HTML below shows you how to create a Fahrenheit to Celsius converter using JavaScript: function temp(form) { var f = parseFloat(form.DegF.value, 10); var c = 0; c = (f ) * 5.0 / 9.0; form.DegC.value = c; }
Transcript of Javascript JavaScript is what is called a client-side scripting language: a programming language...
Javascript
JavaScript is what is called a client-side scripting language: a programming language that runs inside an Internet
browser (a browser is also known as a Web client because it connects to a Web server to download pages)
Inside a normal Web page you place some JavaScript code. When the browser loads the page, the browser has a built-in interpreter that reads the JavaScript code it finds in the page and runs it.
Possible Usage
Web page designers use JavaScript in many different ways: One of the most common is to do field validation in
a form. Many Web sites gather information from users in online forms, and JavaScript can help validate entries. For example, the programmer might validate that a person's age entered into a form falls between 1 and 120.
Another way that web page designers use JavaScript is to create calculators.
Simple Calculator (1)
The HTML below shows you how to create a Fahrenheit to Celsius converter using JavaScript:
<HEAD><SCRIPT>function temp(form){ var f = parseFloat(form.DegF.value, 10); var c = 0; c = (f - 32.0) * 5.0 / 9.0; form.DegC.value = c;}</SCRIPT></HEAD>
Simple Calculator (2)
In the body of the page there is a typical form:<FORM><h2>Fahrenheit to Celsius Converter</h2>Enter a temperature in degrees F: <INPUT NAME="DegF" VALUE="0" MAXLENGTH="15" SIZE=15><p>Click this button to calculate the temperature in degrees C:<INPUT NAME="calc" VALUE="Calculate" TYPE=BUTTON onClick=temp(this.form)><p>Temperature in degrees C is: <INPUT NAME="DegC" READONLY SIZE=15></FORM>
