numbers - dojo empty numbertextbox is displaying NaN , but I dont want either defualt value to it -

i have numbertextbox in datagrid editable. if empty, displaying nan, don't want either default value .
should such (blank). please, me. how can achieve in dojo?

try setting contraints parameter this:

var mynumberbox = new dijit.form.numbertextbox({     constraints: { pattern: "0.####" },  // pattern number displayed or set     value: "",       // starting value if value isn't set other source     required: false, // may want set true if user input required     placeholder: "(blank)" // shown when no value present }); 

whenever value of number box, may want pass through parseint(value) or parsefloat(value) first. check if it's number.

var value = parsefloat(mynumberbox.get("value")); if ( isnan(value) ) {     // code handle if nan } 

for more help, go link.

i hope helps.