Not allow special character alone in textbox in javascript

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I Have one text box which is alone Alphanumeric and special character. But i should not allow Special character alone. How Can i restrict this in JavaScript?

What I have tried:

i should not allow Special character alone. How Can i restrict this in JavaScript

Posted 2-Sep-18 20:14pm

gbalamurugan

Updated 12-Sep-18 2:42am

v2

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Comments

Mohibur Rashid 3-Sep-18 5:22am

You are talking about validation. And your validation requirement is not clear. Try regular expression. A simple example, when you want to accept lowercase character only, the following javascript code will work
/^[a-z]+$/.test("abc");
-> true
/^[a-z]+$/.test("abC");
-> false

To understand the brief of regular expression, search google

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Sanjeev Maurya · Answer 1 · 2018-09-12T02:42:00

Solution 1

function blockSpecialKey(e)
{
var k;
document.all ? k = e.keyCode : k = e.which;
return ((k > 64 && k < 91) || (k > 96 && k < 123) || k == 8 || k == 32 || (k >= 48 && k <= 57));
}

Posted 12-Sep-18 2:42am

Sanjeev Maurya

Comments

Richard Deeming 13-Sep-18 15:33pm

Read the question again. The OP is not asking how to block "special" characters!

Not allow special character alone in textbox in javascript

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Not allow special character alone in textbox in javascript

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