How to write the Jquery condition for - If a variable value is

Question

I'm writing a validation condition based on a variable name - test. I'm taking the textbox value to a variable- test. If user add character want to restrict the form submission. Below second OR condition will not suit for me because if user input multiple it won't work. Suggestions please...

if(test =="" || test == " "){
}

Are you trying to check if a string *contains* whitespace or *is entirely* whitespace? — David, May 11 '18 at 12:40
if(!test.trim()){} ->for total whitespaces and if(test.indexOf(' ') != -1){} -> for any whitespace. — rrkjonnapalli, May 11 '18 at 12:48

score 2 · Answer 1 · answered May 11 '18 at 12:45

Looks like you are trying to check if user just added white spaces and tries to submit. You can use $.trim for that

$("#b").click(function(){
    
    if($.trim($("#t").val()) === ""){
        alert("not valid")
     }
})

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<textarea id="t"></textarea>

<button id="b">Check</button>

Even if there are multiple whitespaces $.trim will return you "". So you don't have to worry about taking care for more than one white spaces

How to write the Jquery condition for - If a variable value is

1 Answers1