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

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383function 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 }
216function isInteger(str) {
217 var c0 = str.charCodeAt(0);
218 if (c0 >= 48 && c0 <= 57) return !/\D/.test(str);
219 else return false;
220}
46export function integer(value) {
47 if (!Number.isInteger(Number(value))) {
48 return 'Must be an integer'
49 }
50 return undefined
51}
163integer(value)
164{
165 return (/^(-?[1-9]\d*|0)$/).test(value);
166}
62function isInt(value) {
63 return Math.floor(value)== value;
64}
249function isValidInteger (value) {
250 return /^[+-]?\d+$/.test(value);
251}
171function isPositiveInteger(s) {
172 var re = /^[0-9]+$/;
173 return re.test(s)
174}
97function isInteger (value) {
98 logger(`isInteger`, value)
99 return isNumber(value) && !isNan(value) && value % 1 === 0
100}
62function isNumber(value) {
63 var patrn = /^(-)?\d+(\.\d+)?$/;
64 if (patrn.exec(value) == null || value == "") {
65 return false
66 } else {
67 return true
68 }
69}

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