Java script function which do not let entering characters into a textbox except , and -

Question

0.00/5 (No votes)

See more:

I have an additional problem with the function:

JavaScript

function checkInp() {
var input = document.getElementsByTagName("input");
for (var i =0; i < input.length; i++) {
if (input[i].type == "text") {
if (isNaN(input[i].value)) {
alert("Not Number");
return false;
}
}
}
}

this function works fine till I have to input negative numbers and decimal numbers which I separate them with comma (,) ex: -12.3 or -3,4 ... How can I exclude comma( ,) and minus(-) to recognize them as characters?

Posted 28-Nov-14 0:29am

Voley

Updated 28-Nov-14 0:40am

Suraj Sahoo | Coding Passion

v4

Add a Solution

2 solutions

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)

GauravSaxena.Net · Answer 1 · 2014-11-28T19:30:00

Solution 1

Hi Can you please elaborate more, what exactly you required. Do you need to put only characters or numbers or any combinations.

Posted 28-Nov-14 19:30pm

GauravSaxena.Net

Peter Leow · Answer 2 · 2014-11-28T21:48:00

Try regex then:

C#

function checkInp() {
var input = document.getElementsByTagName("input");
for (var i =0; i < input.length; i++) {
    if (input[i].type == "text") {
       var str = input[i].value;
       var pattern = /^[-]?(\d+(?:[\.\,]\d+)?)$/g;
       var result = pattern.test(str);
       if (!result) {
          alert("Not Number");
          return false;
       } else {
         alert(input[i].value);
       }
    }
}
}

Read more: JavaScript RegExp Reference[^]