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CHAPTER 12 PUTTING IT ALL TOGETHER
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Now, add the following displayAjaxLoading function to global.js. This function takes a DOM element as its argument and then removes any children from that element. Once children are removed, it appends an image with the loading.gif as the source. function displayAjaxLoading(element) { while (element.hasChildNodes()) { element.removeChild(element.lastChild); } var content = document.createElement("img"); content.setAttribute("src","images/loading.gif"); content.setAttribute("alt","Loading..."); element.appendChild(content); } Now comes the fun part. Write a new function called submitFormWithAjax. This function will take a Form object as the first argument and a target object as the second argument. 1. 2. 3. 4. 5. Call the displayAjaxLoading function to remove the children from the target element and add the loading.gif image. Assemble the form values into a URL-encoded string to send in the Ajax request. Create an Ajax request using POST and send the form values to submit.html. If the request is successful, parse the response and display it in the target element. If the request fails, display an error message.
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Start off the submitFormWithAjax function by checking to see if you have a valid XMLHttpRequest object before altering the DOM to display the loading image. function submitFormWithAjax( whichform, thetarget ) { var request = getHTTPObject(); if (!request) { return false; } displayAjaxLoading(thetarget); Next, create a URL-encoded data string to send to the server as the body of the POST request. The string uses the familiar format you see in URL variables: name=value&name2=value2&name3=value3 Each of the values from the form needs to be escaped in the data string. For example, if the form contains a message such as Why does 2+2=4 , your string could look something like this: message=Why does 2+2=4 &name=me&email=me@example.com The plus (+), equal (=), and question mark ( ) characters now pose problems in the string: Does = mean that there is a field with the name 2 and a value of 4 Is the + an encoded space, or does it mean a plus sign Does the start an argument list
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To alleviate these problems, you can use the encodeURIComponent JavaScript function to encode the values to a URL-safe string. This function converts ambiguous characters into their ASCII equivalents: message=Why%20does%202%2B2%3D4%3F%26&name=Me&email=me%40example.com
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To do this for your form elements, loop though the fields the same way you did when validating the form, but instead of the check, collect the name and encoded value for each field in an array: var dataParts = []; var element; for (var i=0; i<whichform.elements.length; i++) { element = whichform.elements[i]; dataParts[i] = element.name + '=' + encodeURIComponent(element.value); } Once you have all the parts, join them together with an ampersand (&): var data = dataParts.join('&'); Next, start your POST request using the original form s action: request.open('POST', whichform.getAttribute("action"), true); and the application/x-www-form-urlencoded header to the request: request.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); This header is required for POST requests and indicates that the request contains an URL-encoded form. Now your request is ready. But before you send it off, you need to create your onreadystatechange event handler to deal with the response. The response you re going to get back from the server is the submit.html page. This page is just like all the other pages in the Domsters site. It contains a header, navigation, and content. Since you re loading the result back into the existing page, you don t need the header and navigation. All you re really interested in is the content within the <article> element. The rest of the markup is there for when Ajax is not available and submit.html loads as a regular page. If this were a server-side script in your favorite flavor of programming language, you could alter the response to output only the desired bits. For now, let s assume that you don t want to alter any serverside scripts. You just want to improve the user experience with a little Ajax. To extract the <article> from the response, you re going to use something called a regular expression. In simple terms, a regular expression is a pattern that you can use to match various parts of a string. Here s the regular expression you ll be using to extract the <article> element s content: /<article>([\s\S]+)<\/article>/ In JavaScript, a regular expression pattern begins and ends with a /, which denotes the start and end of a pattern. If the pattern itself contains a /, then it must be escaped with a \, as done for the closing </article> tag in this pattern. To match characters in a regular expression pattern, you simply enter the characters you re looking for. You want to begin with <article> and end with </article>, so you start and end your pattern the same way.
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Note Regular expressions use some special characters such as brackets and symbols. If you want to match them directly, they will need to be escaped, just like /. For example, if you want to include an asterisk (*) in your pattern, you need to use \*, because * is a quantifier used to indicate repetition. For a list of special characters, see http://en.wikipedia.org/wiki/Regular_expression.
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