javascript - how to add comma in textfield in html web page -

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this question has answer here:

i have web page in input data <input />, 1000 want 1,000 not change id value show becuase using same id in other calculation if 1,000 show nan... how can avoid this?

<input type="text" id="test" onblur="addcommas()"> <script>     function addcommas(nstr){         var offset = nstr.length % 3;         if (offset == 0)             return nstr.substring(0, offset) + nstr.substring(offset).replace(/([0-9]{3})(?=[0-9]+)/g, "$1,");         else             return nstr.substring(0, offset) + nstr.substring(offset).replace(/([0-9]{3})/g,    ",$1");     }     alert(addcommas("1234567")); </script>

i have got code forum... have idea how make function simple shows in input box when id value shows 1000?

test value this :

function isnumber(n) {     return !isnan(parsefloat(n)) && isfinite(n); }

it prevent nan's.

and use @pete's link know how print number commas thousands separators in javascript

edit comment : can use <input type="hidden" id="testvalue" /> , store real value in it.

so code :

<input type="text" id="test" onblur="addcommas(this)"> <input type="hidden" id="testrealvalue"> <script>     function isnumber(n) {         return !isnan(parsefloat(n)) && isfinite(n);     }     function addcommas(input){         nstr = input.value;         if(!isnumber(nstr))return;         document.getelementbyid("testrealvalue").value = nstr;         var offset = nstr.length % 3;         if (offset == 0)             input.value = nstr.substring(0, offset) + nstr.substring(offset).replace(/([0-9]{3})(?=[0-9]+)/g, "$1,");         else             input.value = nstr.substring(0, offset) + nstr.substring(offset).replace(/([0-9]{3})/g,    ",$1");     } </script>

here jsfiddle


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