5 examples of 'jquery if variable exists' in JavaScript

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50function isVarDefined(variable) {
51 return typeof variable !== 'undefined';
52}
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12function getQueryVariable(variable) {
13 let query = window.location.search.substring(1);
14 let vars = query.split("&");
15 for (let i = 0; i < vars.length; i++) {
16 let pair = vars[i].split("=");
17 if (pair[0] == variable) { return pair[1]; }
18 }
19 return (false);
20}
589function hasJQueryData(object) {
590 var data = evalJQueryData(object);
591 for (var x in data) {
592 if (data.hasOwnProperty(x)) {
593 return data;
594 }
595 }
596};
6function isDefined (variable) {
7 return !(variable === undefined || variable === '' || variable === null)
8}
23function isNotEmpty(variable) {
24 return (undefined !== variable && null !== variable);
25}

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