Pick form field values and calculate totals using jquery -

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मेरे पास इन पंक्तियों के साथ एक फ़ॉर्म है: 

  & lt ; टीडी & gt; - & lt; / td & gt; & Lt; input id = "invoice_invoice_line_items_attributes_2_item_type" name = "इनवॉइस [invoice_line_items_attributes] [2] [मद_प्रकार]" प्रकार = "छिपा" मान = "अन्य" / & gt; & LT; टीडी & gt; & lt; इनपुट आईडी = "invoice_invoice_line_items_attributes_2_description" नाम = "चालान [invoice_line_items_attributes] [2] [विवरण]" आकार = "30" type = "text" / & gt; & lt; / टीडी & gt; & LT; टीडी & gt; & lt; इनपुट वर्ग = "लघु" id = "invoice_invoice_line_items_attributes_2_quantity" नाम = "चालान [invoice_line_items_attributes] [2] [मात्रा]" आकार = "30" type = "text" / & gt; & lt; / टीडी & gt; & LT; टीडी & gt; & lt; इनपुट वर्ग = "लघु प्रारूप मुद्रा" id = "invoice_invoice_line_items_attributes_2_rate" नाम = "चालान [invoice_line_items_attributes] [2] [दर]" आकार = "30" type = "text" / & gt; & lt; / टीडी & gt; & LT; टीडी & gt; & lt; इनपुट वर्ग = "लघु प्रारूप मुद्रा" id = "invoice_invoice_line_items_attributes_2_amount" नाम = "चालान [invoice_line_items_attributes] [2] [राशि]" आकार = "30" type = "text" / & gt; & lt; / टीडी & gt; & Lt; / टीआर & gt; & LT; टीआर & gt; & Lt; input id = "invoice_invoice_line_items_attributes_3_invoice_id" name = "इनवॉइस [invoice_line_items_attributes] [3] [इनवॉइस_आईडी]" टाइप करें "" छुपा "/ & gt; & LT; टीडी & gt; - & lt; / td & gt; & Lt; input id = "invoice_invoice_line_items_attributes_3_item_type" name = "इनवॉइस [invoice_line_items_attributes] [3] [मद_प्रकार]" प्रकार = "छिपा" मान = "अन्य" / & gt; & LT; टीडी & gt; & lt; इनपुट आईडी = "invoice_invoice_line_items_attributes_3_description" नाम = "चालान [invoice_line_items_attributes] [3] [विवरण]" आकार = "30" type = "text" / & gt; & lt; / टीडी & gt; & LT; टीडी & gt; & lt; इनपुट वर्ग = "लघु" id = "invoice_invoice_line_items_attributes_3_quantity" नाम = "चालान [invoice_line_items_attributes] [3] [मात्रा]" आकार = "30" type = "text" / & gt; & lt; / टीडी & gt; & LT; टीडी & gt; & lt; इनपुट वर्ग = "लघु प्रारूप मुद्रा" id = "invoice_invoice_line_items_attributes_3_rate" नाम = "चालान [invoice_line_items_attributes] [3] [दर]" आकार = "30" type = "text" / & gt; & lt; / टीडी & gt; & LT; टीडी & gt; & lt; इनपुट वर्ग = "लघु प्रारूप मुद्रा" id = "invoice_invoice_line_items_attributes_3_amount" नाम = "चालान [invoice_line_items_attributes] [3] [राशि]" आकार = "30" type = "text" / & gt; & lt; / टीडी & gt; & Lt; / टीआर & gt; & LT; टीआर & gt; & Lt; input id = "invoice_invoice_line_items_attributes_4_invoice_id" name = "इनवॉइस [invoice_line_items_attributes] [4] [इनवॉइस_आईडी]" टाइप करें "" छुपा "/ & gt; & LT; टीडी & gt; - & lt; / td & gt; & Lt; input id = "invoice_invoice_line_items_attributes_4_item_type" name = "इनवॉइस [invoice_line_items_attributes] [4] [मद_प्रकार]" प्रकार = "छिपा" मान = "अन्य" / & gt; & LT; टीडी & gt; & lt; इनपुट आईडी = "invoice_invoice_line_items_attributes_4_description" नाम = "चालान [invoice_line_items_attributes] [4] [विवरण]" आकार = "30" type = "text" / & gt; & lt; / टीडी & gt; & LT; टीडी & gt; & lt; इनपुट वर्ग = "लघु" id = "invoice_invoice_line_items_attributes_4_quantity" नाम = "चालान [invoice_line_items_attributes] [4] [मात्रा]" आकार = "30" type = "text" / & gt; & lt; / टीडी & gt; & LT; टीडी & gt; & lt; इनपुट वर्ग = "लघु प्रारूप मुद्रा" id = "invoice_invoice_line_items_attributes_4_rate" नाम = "चालान [invoice_line_items_attributes] [4] [दर]" आकार = "30" type = "text" / & gt; & lt; / टीडी & gt; & LT; टीडी & gt; & lt; इनपुट वर्ग = "लघु प्रारूप मुद्रा" id = "invoice_invoice_line_items_attributes_4_amount" नाम = "चालान [invoice_line_items_attributes] [4] [राशि]" आकार = "30" type = "text" / & gt; & lt; / टीडी & gt; & Lt; / टीआर & gt;

मैं मात्रा फ़ील्ड, दर फ़ील्ड से मूल्यों को चुनना और "_amount" टेक्स्टफील्ड में प्रदर्शित होने वाली राशि की गणना करना चाहता हूं। मूल्यों को बदलने से उपयोगकर्ताओं को रोकने के लिए राशि फ़ील्ड लॉक करनी चाहिए। लूप के अलावा मैं यह कैसे प्राप्त कर सकता हूं?

इनपुट में से एक में एक सीएसएस वर्ग जोड़ें फ़ील्ड या तालिका की पंक्तियाँ, और फिर $। प्रत्येक () का उपयोग उन पर पुनरावृत्त करें।


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