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I have the following to disallow spaces

function nospaces(t){

    if(t.value.match(/\s/g)){

        alert('Username Cannot Have Spaces or Full Stops');

        t.value=t.value.replace(/\s/g,'');

    }

}

HTML

<input type="text" name="username" value="" onkeyup="nospaces(this)"/>

It works well for spaces but how can I also disallow full stops as well?

I have the following to disallow spaces

function nospaces(t){

    if(t.value.match(/\s/g)){

        alert('Username Cannot Have Spaces or Full Stops');

        t.value=t.value.replace(/\s/g,'');

    }

}

HTML

<input type="text" name="username" value="" onkeyup="nospaces(this)"/>

It works well for spaces but how can I also disallow full stops as well?

  • javascript
  • forms
  • validation
  • field
Share Improve this question edited May 26, 2013 at 5:46 me_digvijay 5,50210 gold badges51 silver badges86 bronze badges asked May 26, 2013 at 5:42 Adam GAdam G 842 silver badges8 bronze badges
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3 Answers 3

Reset to default 3

Try this

    function nospaces(t){
        if(t.value.match(/\s|\./g)){
            alert('Username Cannot Have Spaces or Full Stops');
            t.value=t.value.replace(/\s/g,'');
        }
    }

Below is the sample html and javscript you just wanted to add /./g for checking for .

<html>
<input type="text" name="username" value="" onkeyup="nospaces(this)"/>
<script>
function nospaces(t){

    if( t.value.match(/\s/g) || t.value.match(/\./g)  ){

        alert('Username Cannot Have Spaces or Full Stops');

        t.value= (t.value.replace(/\s/g,'') .replace(/\./g,''));

    }

}
</script>
</html>

If not its not necessary to use regex you can use 

if(value.indexOf('.') != -1) {
    alert("dots not allowed");
}

or if required

if(value.match(/\./g) != null) {
    alert("Dots not allowed");
}

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