Allow number only in TextField by javascript

this example allow only number character in you text field.

—- JavaScript code

function numeralsOnly(thisComp,e,isDecimal) {
var key;
var keychar;
if (window.event) {
key = window.event.keyCode;
}
else if (e) {
key = e.which;
}
else {
return true;
}

// check double period/decimal/point
if (  ((thisComp.value).indexOf(‘.’) > -1) && key == 46){
alert(“Double period is not allow for this field.”);
return false;
}

var str = ’0123456789′;
str +=isDecimal ? ‘.’:”;
keychar = String.fromCharCode(key);
if ((key==null) || (key==0) || (key==8) ||  (key==9) || (key==13) || (key==27) ) {
return true;
}
else if (((str).indexOf(keychar) > -1)) {
return true;
}

alert(“Enter numerals only in this field.”);
thisComp.focus();
//thisComp.select();
return false;
}

——- html code

<input type=”text” id=”txtSkuPrice”  onkeypress=”return numeralsOnly(this,event,true);”/>

numeralsOnly(this,event,true) -> for Double number use true and for integer number use false.

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