JavaScript error: "val.match is not a function"
I would say that val
is not a string.
I get the
val.match is not function
error for the following
var val=12;
if(val.match(/^s+$/) || val == ""){
document.write("success: " + val);
}
The error goes away if you explicitly convert to a string String(val)
var val=12;
if(String(val).match(/^s+$/) || val == ""){
document.write("success: " + val);
}
And if you do use a string you don't need to do the conversion
var val="sss";
if(val.match(/^s+$/) || val == ""){
document.write("success: " + val);
}
the problem is: val is not string
i can think of two options 1) convert to string: might be a good option if you are sure val has to be string
"Same as above answer"
var val=12;
if(String(val).match(/^s+$/) || val == ""){
document.write("success: " + val);
}
2) skip the line: in my case, it was better to just check the val type and skip if it is not string, because it was not a good idea to run "match" function anyways.
val = 12;
if( val.match) {
if(val.match(/^s+$/) || val == "" ) {
document.write("success: " + val);
}
} else {
document.write("not a string: " + val);
}
NOTE: making this an answer as suggested above from my comment.
Definitely make sure val is defined and a String. Also, I'm guessing it's a typo that you don't have a slash before the 's' in your regex. If that is the case you can replace your if test with "if(val.match(/^\s*$)"