10 examples of 'javascript check if string is integer' in JavaScript

383
function integer(value) {
384
    return /^(?:[-+]?(?:0|[1-9][0-9]*))$/.test(value);
385
}

72
, Integer     : function _fnValidInteger(obj) {
73
                  var elValue = $(obj).val();
74
                  var isValid = ( (elValue.length===0) || (/^-?\d+$/.test(elValue)) );
75
                  return isValid;
76
                  //return spa['_validate']._showValidateMsg(obj, msg, isValid);
77
                }

216
function isInteger(str) {
217
	var c0 = str.charCodeAt(0);
218
	if (c0 >= 48 && c0 <= 57) return !/\D/.test(str);
219
	else return false;
220
}

46
export function integer(value) {
47
  if (!Number.isInteger(Number(value))) {
48
    return 'Must be an integer'
49
  }
50
  return undefined
51
}

163
integer(value)
164
{
165
	return (/^(-?[1-9]\d*|0)$/).test(value);
166
}

62
function isInt(value) {
63
  return Math.floor(value)== value;
64
}

249
function isValidInteger (value) {
250
	return /^[+-]?\d+$/.test(value);
251
}

171
function isPositiveInteger(s) {
172
	var re = /^[0-9]+$/;
173
	return re.test(s)
174
}

97
function isInteger (value) {
98
  logger(`isInteger`, value)
99
  return isNumber(value) && !isNan(value) && value % 1 === 0
100
}

62
function isNumber(value) {
63
    var patrn = /^(-)?\d+(\.\d+)?$/;
64
    if (patrn.exec(value) == null || value == "") {
65
        return false
66
    } else {
67
        return true
68
    }
69
}