Library Manager: https://nicknack.knack.com/library-manager#home

library-manager.js

function searchBook(isbn) {
  // fetch the book information using Google API's ISBN search:
  // https://developers.google.com/books/
  return $.get('https://www.googleapis.com/books/v1/volumes?q=isbn:' + isbn);
}

function initSearch($isbn) {
  // Focus on the isbn input immediately
  $isbn.focus();
  
  // When the view first loads, if there's an isbn already filled in, search for a book
  // Happens when we open the view with URL variables filled in
  populateFields($isbn);
  
  // Every time the isbn value is updated, search for a book
  $isbn.on('input', function(keyup_event){
    populateFields($isbn);
  });
}

function populateFields($isbn) {
  
  // Only trigger the search if there's an isbn value with more than 9 characters
  if ($isbn.val().length > 9) {
    setTimeout(function() {
      
      Knack.showSpinner();
      
      // search for the book
      searchBook($isbn.val()).then(function(response){
        // If google gives us back a book...
        if(response.items && response.items.length) {          
          let book = response.items[0].volumeInfo;
          
          // Populate all the desired form inputs
          $('#field_1').val(book.title);
          $('#field_8').val(book.authors[0]);
		  $('#field_5').val(book.description);
          
          // If google gives us back images (sometimes they don't), fill those in too
          if(book.imageLinks && book.imageLinks.thumbnail) {
            $('#field_9').val(book.imageLinks.thumbnail);
          }


          Knack.hideSpinner();
        }
      });
    },500);
  }
}

// Example Book: Steve Jobs isbn: 9781451648546
// On the "Add Book Inventory" Form: https://nicknack.knack.com/library-manager#book-inventory/add-book-inventory/
$(document).on('knack-view-render.view_7', function(){
  initSearch($('input#field_4'));
  
});

// Example Book: Steve Jobs isbn: 9781451648546
// On the "Add Book" Form: https://nicknack.knack.com/library-manager#home/add-book/
$(document).on('knack-view-render.view_14', function(){
  initSearch($('input#field_4'));
});

// Example Book: Fire and Blood: 9781524796280
// On the "Search" Form: https://nicknack.knack.com/library-manager#home/

// After a search is made...
$(document).on('knack-records-render.view_10', function(event, view, records){
  let $isbn = $('span.value input');
  
  setTimeout(function(){
    $isbn.focus();
  },300);
  
  // If there were no records found...
  if(!records.length) {
    
    let url_var = JSON.stringify({"field_4":$isbn.val()});
    
    // Modify the "No Data" text with a link to the "Add Book" form with the search value filled in
    $('#no_result_link').attr('href', $('#no_result_link').attr('href') + '?view_14_vars=' + encodeURIComponent(url_var))
  }
});

// When adding book inventory: https://nicknack.knack.com/library-manager#book-inventory/add-book-inventory/
// Automatically focus on the Barcode - UPC field for easy scanning
$(document).on('knack-view-render.view_16', function(event, view, records) {
  setTimeout(function(){
  	$('#field_34').focus();
  }, 500)
});