Have a simple script in place that works well but doesn't account for all forms of 0 (0.0, 0.00..etc) What is the simplest way to achieve this? Maybe parseFloat?

if(value !== "0") {
 alert('No sir this cant be empty');
 return false;
}

if they put in 0 in the textbox it will return false fine. However, if they put 0.0 it will return true

Have a simple script in place that works well but doesn't account for all forms of 0 (0.0, 0.00..etc) What is the simplest way to achieve this? Maybe parseFloat?

if(value !== "0") {
 alert('No sir this cant be empty');
 return false;
}

if they put in 0 in the textbox it will return false fine. However, if they put 0.0 it will return true

• javascript

Share Improve this question Follow asked Nov 2, 2013 at 1:51 LynxLynx 1,48255 gold badges3535 silver badges6363 bronze badges 4

• > 'Maybe parseFloat?' Sounds like you're answering your own question, there :) – Christian Ternus Commented Nov 2, 2013 at 1:53
• You've already answered your question. Use parseFloat. =) – Guilherme Sehn Commented Nov 2, 2013 at 1:53
• Why don't you try parseFloat and see what happens? – Qantas 94 Heavy Commented Nov 2, 2013 at 1:54
• parseFloat wasn't working for me but with some of these suggestions that might work thanks everyone! – Lynx Commented Nov 2, 2013 at 2:06

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5 Answers 5

Sorted by: Reset to default 4

You could use parseFloat and pare against 0

if (parseFloat(value) !== 0) {
    // plain
}

Yes you can parseFloat it but you shouldn't need to use quotes around your value.

value !== 0

Parse it into an actual number first, similar to this:

value = parseFloat(value)

if( value === 0 ) return false;

You'll want to look into parseInt() and parseFloat()

Perhaps you might try a regular expression match?

if (value.match(/^0(?:\.0+)?$/)) {
    alert("hey!");
}

I'd use parseInt, seems to be the simplest:

if(parseInt(value, 10) != 0) {
 alert('No sir this cant be empty');
 return false;
}

But be sure you test value against undefined, null and empty string before that.