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I have loop inside loop like this: var len = bolumlerUnique.length; function bolumleriGonder() { for (i = 0; i < bolumlerUnique.length; i++) { elementBolumler = $("[bolumid=" + bolumlerUnique[i] + "]:checked"); console.log(elementBolumler); for (j = 0; j < len; j++) { console.log(elementBolumler[j]) } } } bolumlerUnique is an array --> ["1", "2", "3", "4"] I have radio inputs and find elements with this code $("[bolumid=" + bolumlerUnique[i] + "]:checked"); But in the second loop console.log writes undefined. But elementBolumler is defined global variable. JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

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Check your len variable is have a value it must work with your codes.

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