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javascript check if undefined or null Code Example
javascript check if undefined or null 
if( typeof myVar === 'undefined' || myVar === null ){
    // myVar is undefined or null
}
javascript if undefined 
if(typeof comment === 'undefined') {

  alert('Variable "comment" is undefined.');

} else if(comment === null){

  alert('Variable "comment" is null.');

}
Source: www.tutorialrepublic.com
javascript syntax for check null or undefined or empty 
if (typeof value !== 'undefined' && value) {
    //deal with value'
};
Source: stackoverflow.com
js is undefined or null 
var myVar=null;

if(myVar === null){
    //I am null;
}

if (typeof myVar === 'undefined'){
    //myVar is undefined
}



Javascript

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Type:
 Code Example
Category:
 Coding
Sub Category:
 Code Example
Uploaded by:
 Admin
Views:
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