php - Javascript - How to change a new value on drop down -

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जब हम name = "quantity" को बदलते हैं और $ product ['price] '] मान भी बदल जाएगा यहां गतिशील मात्रा और मूल्य होगा। Jquery / javascript का उपयोग करने के लिए कैसे करें। 

  & lt;? Php $ select = "SELECT * FROM` PRODUCTS 'ORDER द्वारा `आईडी` डीईएससी LIMIT 10"; $ Query = mysql_query ($ चुनें) या मर (mysql_error ()); ? & Gt; & LT; ul & gt; & Lt;? Php जबकि ($ product = mysql_fetch_array ($ query)) {? & Gt; & Lt; li & gt; & Lt; p & gt; & lt;? Php ईको $ उत्पाद ['नाम'];? & Gt; & lt; / p & gt; & Lt; p & gt; मात्रा & lt; चयन करें नाम = "मात्रा" & gt; & Lt;? Php for ($ i = 1; $ i & lt; = $ उत्पाद ['मात्रा']; $ i ++) {? & Gt; & Lt; विकल्प मान = "& lt;? Php echo $ i;? & Gt;" & gt; & lt;? Php इको $ i; ? & Gt; & lt; / विकल्प & gt; & Lt;? Php}? & Gt; & Lt; / चयन & gt; & Lt; / p & gt; & Lt; p & gt; & lt;? Php $ उत्पाद ['मूल्य'];? & Gt; & lt; / p & gt; & Lt; / li & gt; & Lt;? Php}? & Gt; & Lt; / ul & gt;

मुझे पता है:)

jQuery का उपयोग करना : 

  $ (दस्तावेज़) .ready (function () {$ ("# quantity_select")। बाँध ("परिवर्तन", फ़ंक्शन () {selected_option = $ ("विकल्प : चयनित ")। Val (); $ (" # काउंटर ")। Html (selected_option);});});

... 

  & lt; आईडी चुनें = "मात्रा_सच्ची" & gt; & Lt; विकल्प मान = "1" & gt; 1 & lt; / विकल्प & gt; & Lt; विकल्प मान = "2" & gt; 2 & lt; / विकल्प & gt; & Lt; विकल्प मान = "3" & gt; 3 & lt; / विकल्प & gt; & Lt; विकल्प मान = "4" & gt; 4 & lt; / विकल्प & gt; & Lt; / चयन & gt; & Lt; div id = "काउंटर" & gt; & lt; / div & gt;   
 आप  text  के बजाय  val ()  का उपयोग कर सकते हैं यदि आप  मान के बजाय वास्तविक टेक्स्ट देखना चाहते हैं < / कोड> विशेषता।

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