javascript - Unable to access hidden field values in java script -

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जेएसपी: 

  & lt; इनपुट प्रकार = 'छुपा' id = '& lt; बीन : नाम लिखें = "शैक्षणिक GoalLevel" property = "contentId1" / & gt; ' नाम = '& lt; बीन: लिखें नाम = "शैक्षणिक GoalLevel" property = "contentId1" / & gt; मान = '& lt; बीन: लिखित नाम = "शैक्षणिक GoalLevel" संपत्ति = "गतिविधि 1" / & gt; / & Gt;

जावास्क्रिप्ट: 

  // id 30 केवल var x = document.getElementById ('30 ') मान है; चेतावनी (x); अगर (x.length! = 0) {चेतावनी ("कृपया एक स्कूल वर्ष 1 दर्ज करें"); विवरण झूठा है; }

पहली बार जब मैं पेज पर जाता हूं और पाठ फ़ील्ड में डेटा दर्ज करता हूं तो मैं जावास्क्रिप्ट में वैल्यू प्राप्त करने में सक्षम नहीं हूं।

जब मैं आऊंगा दूसरी बार मुझे छिपे हुए खेतों मिलते हैं।

मैं इसे कैसे हल कर सकता हूं?


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