How to prevent a user from entering vulnerable characters in a textbox?

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2.23/5 (3 votes)

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Hello..
I have a textbox and i want to prevent the user from entering characters which may cause harm to my database when i submit my form containing this textbox..
Can you help me plzz..
Thank u.. ..

Posted 18-Mar-14 20:23pm

Member 10626057

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Kornfeld Eliyahu Peter 19-Mar-14 4:04am

Are you storing the data directly from JavaScript? Or there is a server side component for that?

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Bernhard Hiller · Answer 1 · 2014-03-18T23:54:00

Solution 3

That's the wrong idea. Any hacker who is beyond the knowledge of a script kiddie beginner will know how to submit the values using a script. And there he can enter anything he wants to do so. You have to secure your server, e.g. Parameterized Queries for the databse communication.

Posted 18-Mar-14 23:54pm

Bernhard Hiller

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Member 10626057 19-Mar-14 14:11pm

sql injection?

Sampath Lokuge · Answer 2 · 2014-03-18T20:43:00

Solution 1

You can use Regular expression for that.Hence you have mentioned Javascript,please check below mentioned links for more info.

JavaScript RegExp Object

Regular Expressions

Regular Expressions with JavaScript

Posted 18-Mar-14 20:43pm

Sampath Lokuge

Kan07 · Answer 3 · 2014-03-18T21:43:00

Use Regular Expression validation or use ajava Script validation

js val::

C#

function fncheck()
{
        var pgng = document.getElementById("<%=txtPagingGoto.ClientID%>").value.trim();
        if(pgnd == "")
        {
            alert('The textbox should not be empty...');
            document.getElementById("<%=txtfname.ClientID%>").focus();
            return false;
        }
}

call this fncheck in onclient click of button