Simple calculator with a check option

Question

0.00/5 (No votes)

See more:

I have to make a simple Javascript calculator with an additional option. When a button "Add" or "Divide" is clicked the script should check whether I put any number or the field is empty. How can I do this?

Posted 14-Jan-15 16:21pm

Member 11376116

Add a Solution

Comments

PIEBALDconsult 14-Jan-15 22:36pm

Don't. Have the button disabled except when the values are present.

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

BacchusBeale · Answer 1 · 2015-01-14T16:42:00

Solution 1

Look at isNaN(): http://www.w3schools.com/jsref/jsref_isnan.asp[^]

Posted 14-Jan-15 16:42pm

BacchusBeale