问题
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?
回答1:
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,'');
}
}
回答2:
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>
回答3:
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");
}
来源：https://stackoverflow.com/questions/16756559/how-to-prevent-spaces-and-full-stops-in-input-field-with-javascript