property length is undefined in javascript?

Questions, tips and tricks and techniques for scripting in Servoy

property length is undefined in javascript?

Postby juan.cristobo » Thu May 17, 2012 5:43 pm

Hi, I have this code:

Code: Select all
/**
  * @type {JSDataSet}
*/
var dataset = databaseManager.getDataSetByQuery(...);

if(dataset.getValue(1,5).length < 6) {
...
}


I receive this warning:

Code: Select all
property length is undefined in javascript


How can I do to set the type of dataset.getValue(1,5) (it's a string value)?

Thanks,
Juan
Madrid (Spain)

Servoy 7.4.x - MySQL / SQL Server 2008-2016
Windows 10 Pro
juan.cristobo
 
Posts: 186
Joined: Thu Apr 19, 2012 9:12 am

Re: property length is undefined in javascript?

Postby goldcougar » Fri May 18, 2012 1:09 am

Well, the value could be null, so you should check it first, like:

Code: Select all
if(dataset.getValue(1,5) && dataset.getValue(1,5).length < 6) {
...
}

If your curious to see what the type is, use:

Code: Select all
application.output(typeof dataset.getValue(1,5))
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