javascript check if variable exists
if (typeof myVar !== 'undefined') {
// myVar is defined
}javascript check if variable exists
if (typeof myVar !== 'undefined') {
// myVar is defined
}error check variable
var page_name = $("#pageToEdit :selected").text();
var table_name = $("#pageToEdit :selected").val();
var optionResult = $("#pageToEditOptions :selected").val();
var myMysteryVariable1 = document.getElementByClassName("myClass");
var string = "?z=z";
if ( page_name != 'undefined' ) { string += "&page_name=" + page_name; }
if ( table_name != 'undefined' ) { string += "&table_name=" + table_name; }
if ( optionResult != 'undefined' ) { string += "&optionResult=" + optionResult; }Copyright © 2021 Codeinu
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