Microsoft Jscript runtime Error, Value.Length is null or not and object

Question

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I have used a Javascript function to restrict the length of a text box to 100. The Code of java script function is given below

C#

function Max_LengthLimit_100(obj) {
   
    var testVariableLength = (obj ? obj.value.length : 0);
    if (testVariableLength > 100) {
        return false;
    }
    else {
        return true;
    }
}

I call this function as onKeyPress="javascript:return Max_LengthLimit_100(this);
Its working fine but When I leave the TextBox it produces the following Error "Microsoft Jscript runtime Error, Value.Length is null or not and object." This Error is raised in debug mode but When I publish the website it produces "Error on Page".

What changes should I made to function to avoid Error.

Thanks in Advance
Azhar

Posted 23-Aug-11 19:10pm

Azhar Iqbal SE

Updated 23-Aug-11 19:20pm

Prerak Patel

v2

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Comments

Prerak Patel 24-Aug-11 1:20am

Use code block for code segments.

3 solutions

Solution 1

Use (obj.value == '' ? 0 : obj.value.length); and check that you are passing the textbox object properly to the function.

Posted 23-Aug-11 19:26pm

Prerak Patel

Solution 3

Thanks Prerak Patel.
I have made slight Change to your Code and it work fine for me. Again thanks for your idea and help.

function Max_LengthLimit_100(obj) {
if (obj.value != "" && obj.value!=null) {
if (obj.value.length > 100)
return false;
}
}

regards
Azhar Iqbal

Posted 23-Aug-11 20:31pm

Azhar Iqbal SE

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koolprasad2003 · Accepted Answer · 2011-08-23T19:33:00

have u develope this code in ASP.NET ? if yes then use MaxLength property of textbox. it will help you to restrict the length to 100.

otherwise here is javascript function

JavaScript

function Max_LengthLimit_100(obj)
 {
  
   if (obj.value != "")
      {
        if (value.length > 100) 
        return false;
      }

}

call this function on onkeypress="return Max_LengthLimit_100(this.id)"