Check if the value is empty [duplicate]

Question

How is the "check" made for this to check if a textfield is empty?

Jquery:

$("#AddGoogleMap").click(function () {      
    if($('#googleMapCity').val()==null) {
        alert("You need to fill out a city");
    } else {
     // do something
    }

$('#googleMapCity').val()==='' or $('#googleMapCity').val().length===0 — RafH
– RafH, Commented May 16, 2013 at 13:27
Did you search ? I can't think the question I linked or similar ones wasn't listed when you typed your question. — Denys Séguret
– Denys Séguret, Commented May 16, 2013 at 13:28
@HamZaDzCyberDeV: .empty() removes the content and any nested DOM element. — kiddorails
– kiddorails, Commented May 16, 2013 at 13:28

palaѕн · Accepted Answer · 2013-05-16 13:27:29Z

3

First, remove the whitespace from the beginning and end of a string and then compare the value with the empty string, like:

if( $.trim($('#googleMapCity').val()) === '') {
     alert("You need to fill out a city");
} else {
 // do something
}

answered May 16, 2013 at 13:27

palaѕн

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3 Comments

Software Guy Over a year ago

+1 for suggesting best practice of trimming in case of empty space

Kim Over a year ago

Nice! Thanks! But the thing is it fires even though I fill out something in the field, does it need to be a rule for the "else"?

palaѕн Over a year ago

@Kim: This fiddle might help you! Try it once.

Adil Shaikh · Accepted Answer · 2013-05-16 13:27:12Z

1

if($('#googleMapCity').val() === "") {
 alert("You need to fill out a city");
}

answered May 16, 2013 at 13:27

Adil Shaikh

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Comments

A. Wolff · Accepted Answer · 2013-05-16 13:27:32Z

1

Could be done like this:

if($.trim($('#googleMapCity').val())==="")

answered May 16, 2013 at 13:27

A. Wolff

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Comments

klewis · Accepted Answer · 2013-05-16 13:29:02Z

1

 $("#AddGoogleMap").click(function () {      
    if($('#googleMapCity').val()==='') {
    alert('You need to fill out a city');

     } else {
     // do something
     }

answered May 16, 2013 at 13:29

klewis

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Comments

Rajender Joshi · Accepted Answer · 2013-05-16 13:32:25Z

1

Working Demo

$("#AddGoogleMap").click(function () {      
    if($('#googleMapCity').val() === "") {
        alert("You need to fill out a city");
     } else {
     // do something
     }
});

answered May 16, 2013 at 13:32

Rajender Joshi

4,2251 gold badge26 silver badges41 bronze badges

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