Uncaught TypeError: Cannot read property 'substr' of undefined

Pardon me for not being clear, but have thia script that is really long. When I have it live, I get this error in Chrome's Console.

Uncaught TypeError: Cannot read property 'substr' of undefined

here is the snippet of code where it is reading from.

var formIddd = $('select[class~="FormField"]').get(numSelec).name.substr($('select[class~="FormField"]').get(numSelec).name.length-3,2); 

I looked up substr on google and it appears to be a known property. I also found the classes. I have played with the lengths, but still getting stuck. It used to work until BigCommerce did an update.

Any advice much appreciated, cheers.

3 Answers

You are not populating your array. The if check is false.

so basically you are doing this

var arrayOfSelectOfCountry = []; var numSelec = arrayOfSelectOfCountry[-1]; //undefined 

which results in the error above.

maybe at some point the substr() is called on a null reference

so before using it check that reference for nullity like that

function(jsonDate) { if (jsonDate!=null) { //if the variable is not null you can use substr with no problems var date = new Date(parseInt(jsonDate.substr(6))); //..... } 

take look at my full snippet from Datatable

 columns: [ { 'data': 'ID' }, { 'data': 'Name' }, { 'data': 'DateCreated', 'render': function(jsonDate) { if (jsonDate!=null) { var date = new Date(parseInt(jsonDate.substr(6))); return date.toLocaleDateString(); } return "-"; } }, 

Instead of:

variable.substring(0, 7) 

Do:

variable && variable.substring(0, 7) 

This is how you check for nullity like Basheer mentioned