Strings and JSON in Java

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We ll have to define a few functions and then make the correct call to dojostring substititue Let s see what the code will look likeWe ll focus on the code related to the Dojo function call and leave out some of the detail code for the formatting functions
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dojorequire("dojostring"); // Define functions ucFirst = function(value) { // This function will take a string and make sure the first letter // of the string is upper case and the subsequent letters // in the string are lower case var newValue = // this is left as an exercise for the reader return newValue; dollarAmount = function(value) { // This function will take a number and put a dollar sign in front // of it and ensure that two decimal digits are at the end var newValue = // this is left as an exercise for the reader return newValue; } stringTrim = function(value) { // This function will remove leading and trailing // spaces from a string var newValue = // this is left as an exercise for the reader return newValue; } template = "${fieldname:ucFirst} must be less than ${dollarAmount:dollarAmount}" map = new Object(); mapfieldName = " Credit Limit mapdollarAmount = 100000; ";
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errorMessage = dojostringsubstitute(template, map, stringTrim);
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The value for errorMessage is "Credit Limit must be less than $100000"
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JavaScript allows us to manipulate strings of generic text, but it also provides for a special type of text string called JSON, which is an acronym for JavaScript Object Notation Now wasn t that helpful No We ll let s describe it another way JSON is a technique for
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representing JavaScript objects as text strings After we convert a JavaScript object to text, we can transfer that text around the Internet using HTTP, which only allows plain text to be transmitted In general, we ll use JSON to transfer objects back and forth between the browser to the server Another use for JSON is to create JavaScript objects using a more concise format than we get using methods calls Let s see an exampleWe ll create two objects using both JavaScript and JSON First we ll view the code for creating an object using JavaScript and the standard Object Oriented technique
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// create a new object using JavaScript command object1 = new Object(); object1id = 100; object1name = "ABC Customer";
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Now let s review the code for creating an equivalent object using JSON
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// create a new object using JSON object2 = {id:100, name:"ABC Customer"};
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Both objects are equivalentThey both have the same properties After the object is created, there is really no way to tell they were created using different methods Because we have two different but seemingly equivalent techniques, which one should you use If you want to be like Mike and adhere to the conventions used by Dojo, you should use the JSON technique Not only is JSON preferred by Dojo users, but it is also the preferred technique for most JavaScript programmers We can choose to use JSON or not when creating objects in JavaScript But what options do we have when we want to send those objects to the server or get objects back from the server When the browser builds an HTTP request to send to the server, data can either be sent in the URL (using the GET message type) or within the body of the request (using the POST message type) However, in either case, the data is sent as plain text So we must find a way of converting a JavaScript object from the browser s internal format into a plain text string that can be sent using HTTP JSON is the perfect solution for this problemWe can represent the object as a JSON text string and transmit it between the browser and the serverWe ve already seen that JavaScript provides a syntax for creating an object with JSON, but what about the corresponding syntax to take an object and convert it to JSON As popular as JSON is within the JavaScript community, you would expect there would be an easy way to do that But you would be wrong JavaScript does not provide any native function for producing the JSON equivalent of an objectThere is no toJSON method defined for JavaScript So someone has to write one Fortunately, for us, that someone is Douglas Crockford He s the source for all things JSON and a fount of general wisdom in his role as an industry guru Dojo has taken advantage of his work by providing a few JSON functions based on his work
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