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7 Web Site Design Mistakes That Will Lose You Clients
In today's world, a web site is virtually mandatory for any successful business. But there are web sites that will win you customers, and there are web sites that will lose you customers. Good design has a lot to do with which category your web site...
Finding a Good HTML Editor
Once you've decided to write your own HTML, and you've got some
idea of how it all works, there's one thing left to think about:
which program are you going to use to do it? While you can use
programs like Notepad or Wordpad that come with...
http://www.medprime.com/medprime-articles.html
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Using External JavaScript Files
When you have lots of JavaScript functions and you plan to use them on many web pages, it is always advisable to keep them in a separate file, and then include that file on every page where those functions are required. This way, you can better...
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Validating Numerical Input with JavaScript
What? Make a mistake entering data? Who me? NO WAY! Right.
Every form of data input by a user should be validated in some form or fashion. If you get
clean data in, you won't get garbage out. This tutorial is going to explain how to validate
numerical data entered into a form using JavaScript.
First, let us begin with the code to insert the JavaScript into your HTML document.
Place these lines between the and tags.
This line tells the web browser to expect some JavaScript code and signal the beginning of
the script:
So now the format should look something like this:
My Title
Now on to validating the numerical input.
First we will create a function with one arument:
function validate(mydata){
These lines will test for a blank enty then prompt the user for input:
if (mydata == ""){
alert("Please enter a number.")
}
Next we will create a for loop which will look at each character in the data until it
reaches the end:
for(var i=0;i < mydata.length;i++){
Now create a variable and assign the counter variable value to it:
var mydigit = mydata.charAt(i)
To screen out symbols, punctuation, and letters, place an if statement in the loop:
if(mydigit < "0" || mydigit > "9"){
The || in the if statement scans for both conditions.
The next line will alert the user to any mistakes he/she has made:
alert(mydigit + " is not a number.")
Here is the complete code including HTML:
=============================================
Numerical Validation
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