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Alice watched the cat turn first translucent and then to barely an outline, until nothing was left but the grin. But the cat s mouth continued to repeat the words, Essential, abstract, technology-free, and implementation-independent, even as it disappeared. Alice was rather startled by the cat s disappearance. I ve seen a cat without a grin, but I ve never seen a grin without a cat before, she said, shaking her head slowly. But I can t possibly see how this is going to help me get from use cases to code. This is just so abstract that there doesn t seem to be enough detail there to build a design from. She walked on.

function submitFormWithAjax( whichform, thetarget ) { var request = getHTTPObject(); if (!request) { return false; } displayAjaxLoading(thetarget); var dataParts = []; var element; for (var i=0; i<whichform.elements.length; i++) { element = whichform.elements[i]; dataParts[i] = element.name + '=' + encodeURIComponent(element.value); } var data = dataParts.join('&'); request.open('POST', whichform.getAttribute("action"), true); request.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); request.onreadystatechange = function () { if (request.readyState == 4) { if (request.status == 200 || request.status == 0) { var matches = request.responseText.match(/<article>([\s\S]+)<\/article>/); if (matches.length > 0) { thetarget.innerHTML = matches[1]; } else { thetarget.innerHTML = '<p>Oops, there was an error. Sorry.</p>'; } } else { thetarget.innerHTML = '<p>' + request.statusText + '</p>'; } } }; request.send(data); return true; }; Now you need to actually Hijax the form submission with the submitFormWithAjax function. You must modify your existing prepareForms function to call submitFormWithAjax with the form and the current page's <article> element as the arguments. The modified function should do the following: If the form is not validated, return false, because the validation failed and you don t want to submit the form. If the submitFormWithAjax function successfully set up the Ajax request and returns true, return false from the onsubmit event handler to prevent the browser from submitting the form. Otherwise, if the submitFormWithAjax function failed to set up the Ajax request, return true from the onsubmit event handler and let the form submit as usual through a page load.

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Because log files can be very important for managing your system and for debugging purposes, we decided to give them a section of their own. Several log files may be present in the log directory of the application or client, depending on your logging options. Table 17-4 lists them. Table 17-4. Log Files

Log of all synchronization events performed, showing all changes done to the schema (i.e., tables). Log of all SQL errors, showing the error code and text generated. Logs all SQL statements executed by the named user. It is generated only when SQL tracing is enabled in the user options and the Write to File check box of the Multiple SQL Statements field group is checked.

Alice soon came upon an enormous caterpillar, sitting on a giant mushroom, and smoking a hookah. Hello, said Alice to the caterpillar. You look very wise indeed, sir. Do you think you could possibly help me find out how to get from use cases to code Who are you the caterpillar drawled sleepily. And why do you want to get to code My name is Alice, thank you very much for asking, sir. And I want to get to code because if I don t, someone is likely to come along and cancel my project, and whatever will I do then, don t you see I do not see, said the caterpillar. We define an essential use case as: a single, discrete, complete, meaningful, and well-defined task of interest to an external user in some specific role or roles in relationship to a system, comprising the user intentions and system responsibilities in the course of accomplishing that task, described in abstract, technology-free, implementation-independent terms using the language of the application domain and of external users in role. He inhaled an enormous quantity of smoke from the hookah.

Here's the modified prepareForms function that accomplishes the three points above: function prepareForms() { for (var i=0; i<document.forms.length; i++) { var thisform = document.forms[i]; resetFields(thisform); thisform.onsubmit = function() { if (!validateForm(this)) return false; var article = document.getElementsByTagName('article')[0];

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