javascript - Verify if element exists and pass it to function -


मेरे पास निम्न है: 

  google.maps.event.addDomListener (विंडो, लोड ', सेटमैप); फ़ंक्शन सेटमैप () {var कैनवास = दस्तावेज़.getElementById ('मानचित्र'); // अधिक कोड}   
 मैं JQuery का उपयोग कर रहा हूँ  
 कैसे पता लगा सकता है कि तत्व "मानचित्र" मौजूद है ...  
 और फ़ंक्शन  setMap  को कॉल करें अगर तभी मौजूद है ...  
 और  setMap  फ़ंक्शन के अंदर इसे परिभाषित करने के बजाय इसे भी पास करें।   
 
 < p> इसे आज़माएं:  <पूर्व>  google.maps.event.addDomListener (विंडो, 'लोड', सेटमैप); फ़ंक्शन सेटमैप () {var mapElement = $ ("# map"); अगर (मैप Element.length == 0) {वापसी; } Var कैनवास = document.getElementById ('नक्शा'); // अधिक कोड}

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