diff options
Diffstat (limited to 'demos/quickstart/protected/pages/Tutorial/CurrencyConverter.page')
| -rw-r--r-- | demos/quickstart/protected/pages/Tutorial/CurrencyConverter.page | 343 |
1 files changed, 183 insertions, 160 deletions
diff --git a/demos/quickstart/protected/pages/Tutorial/CurrencyConverter.page b/demos/quickstart/protected/pages/Tutorial/CurrencyConverter.page index c11c1b94..43666560 100644 --- a/demos/quickstart/protected/pages/Tutorial/CurrencyConverter.page +++ b/demos/quickstart/protected/pages/Tutorial/CurrencyConverter.page @@ -1,59 +1,60 @@ <com:TContent ID="body"> - <h1>Building a Simple Currency Converter</h1> - <p>This tutorial introduces the Prado web application framework and teaches + <h1 id="16001">Building a Simple Currency Converter</h1> + <p id="80053" class="block-content">This tutorial introduces the Prado web application framework and teaches you how to build a simple web application in a few simple steps. This tutorial assumes that you are familiar with PHP and you have access to a web server that is able to serve PHP5 scripts. - </p> - - <p>In this tutorial you will build a simple web application that converts - a dollar amount to an other currency, given the rate of that currency + </p> + + <p id="80054" class="block-content">In this tutorial you will build a simple web application that converts + a dollar amount to an other currency, given the rate of that currency relative to the dollar. The completed application is shown bellow. <img src=<%~ example2.png %> class="figure" /> - You can try the application <a href="../currency-converter/index.php">locally</a> or at + You can try the application <a href="../currency-converter/index.php">locally</a> or at <a href="http://www.pradosoft.com/demos/currency-converter/">Pradosoft.com</a>. Notice that the application still functions exactly the same if javascript is not available on the user's browser. </p> - + <h1 id="download">Downloading and Installing Prado</h1> - <p>To install Prado, simply download the latest version of Prado from + <p id="80055" class="block-content">To install Prado, simply download the latest version of Prado from <a href="http://www.pradosoft.com/">http://www.pradosoft.com</a> - and unzip the file to a directory <b>not</b> accessible by your web server + and unzip the file to a directory <b>not</b> accessible by your web server (you may unzip it to a directory accessible by the web server if you wish - to see the demos and test). For further detailed installation, see the + to see the demos and test). For further detailed installation, see the <a href="?page=GettingStarted.Installation">Quickstart Installation</a> guide. </p> - - <h1>Creating a new Prado web Application</h1> - <p>The quickest and simplest way to create a new Prado web application is + + <h1 id="16002">Creating a new Prado web Application</h1> + <p id="80056" class="block-content">The quickest and simplest way to create a new Prado web application is to use the command tool <tt>prado-cli.php</tt> found in the <tt>framework</tt> - directory of the Prado distribution. We create a new application by running + directory of the Prado distribution. We create a new application by running the following command in your - command prompt or console. The command creates a new directory named - <tt>currency-converter</tt> in your current working directory. + command prompt or console. The command creates a new directory named + <tt>currency-converter</tt> in your current working directory. You may need to change to the appropriate directory first. -<com:TTextHighlighter Language="text" CssClass="source"> + See the <a href="?page=GettingStarted.CommandLine">Command Line Tool</a>
+ for more details.
+ </p>
+<com:TTextHighlighter Language="text" CssClass="source block-content" id="code111"> php prado/framework/prado-cli.php -c currency-converter -</com:TTextHighlighter> - See the <a href="?page=GettingStarted.CommandLine">Command Line Tool</a> - for more details. - </p> - - <p>The above command creates the necessary directory structure and minimal +</com:TTextHighlighter> + + <p id="80057" class="block-content">The above command creates the necessary directory structure and minimal files (including "index.php" and "Home.page") to run a Prado web application. Now you can point your browser's url to the web server to serve up the <tt>index.php</tt> script in the <tt>currency-converter</tt> directory. - You should see the message "Welcome to Prado!" + You should see the message "Welcome to Prado!" </p> - - <h1>Creating the Currency Converter User Interface</h1> - <p>We start by editing the <tt>Home.page</tt> file found in the + + <h1 id="16003">Creating the Currency Converter User Interface</h1> + <p id="80058" class="block-content">We start by editing the <tt>Home.page</tt> file found in the <tt>currency-converter/protected/pages/</tt> directory. Files ending - with ".page" are page templates that contains HTML and Prado controls. - We simply add two textboxes, three labels and one button as follows. -<com:TTextHighlighter Language="prado" CssClass="source"> + with ".page" are page templates that contains HTML and Prado controls. + We simply add two textboxes, three labels and one button as follows.
+ </p> +<com:TTextHighlighter Language="prado" CssClass="source block-content" id="form1"> <com:TForm> <fieldset> <legend>Currency Converter</legend> @@ -74,87 +75,93 @@ php prado/framework/prado-cli.php -c currency-converter </div> </fieldset> </com:TForm> -</com:TTextHighlighter> +</com:TTextHighlighter>
+ <p id="refresh" class="block-content"> If you refresh the page, you should see something similar to the following figure. It may not look very pretty or orderly, but we shall change that later using CSS. <img src=<%~ example1.png %> class="figure" /> </p> - - <p> - The first component we add is a + + <p id="80059" class="block-content"> + The first component we add is a <com:DocLink ClassPath="System.Web.UI.TForm" Text="TForm" /> that basically corresponds to the HTML <tt><form></tt> element. - In Prado, only <b>one</b> <tt>TForm</tt> element is allowed per page. - </p> - - <p>The next two pair of component we add is the + In Prado, only <b>one</b> <tt>TForm</tt> element is allowed per page. + </p> + + <p id="80060" class="block-content">The next two pair of component we add is the <com:DocLink ClassPath="System.Web.UI.WebControls.TLabel" Text="TLabel" /> - and + and <com:DocLink ClassPath="System.Web.UI.WebControls.TTextBox" Text="TTextBox" /> that basically defines a label and a textbox for the user of the application - to enter the currency exchange rate. + to enter the currency exchange rate. The <tt>ForControl</tt> property value determines which component that the label is for. This allows the user of the application to click on the label to focus on the field (a good thing). You could have used a plain HTML <tt><label></tt> element to do the same thing, but - you would have to find the correct <tt>ID</tt> of the textbox (or - <tt><input></tt> in HTML) as Prado components may/will render the + you would have to find the correct <tt>ID</tt> of the textbox (or + <tt><input></tt> in HTML) as Prado components may/will render the <tt>ID</tt> value differently in the HTML output. </p> - - <p>The next pair of components are similar and defines the textbox + + <p id="80061" class="block-content">The next pair of components are similar and defines the textbox to hold the dollar value to be converted. The <tt>TLabel</tt> with <tt>ID</tt> value "total" defines a simple label. Notice that the <tt>ForControl</tt> property is absent. This means that this label is simply a simple label which we are going to use to display the converted total amount. </p> - - <p>The final component is a + + <p id="80062" class="block-content">The final component is a <com:DocLink ClassPath="System.Web.UI.WebControls.TButton" Text="TButton" /> that the user will click to calculate the results. The <tt>Text</tt> property sets the button label. </p> - - <h1>Implementing Currency Conversion</h1> - - <p>If you tried clicking on the "Convert" button then the page will refresh + + <h1 id="16004">Implementing Currency Conversion</h1> + + <p id="80063" class="block-content">If you tried clicking on the "Convert" button then the page will refresh and does not do anything else. For the button to do some work, we need to add a "Home.php" to where "Home.page" is. The <tt>Home</tt> class should extends the <com:DocLink ClassPath="System.Web.UI.TPage" Text="TPage" />, the default base - class for all Prado pages. -<com:TTextHighlighter Language="php" CssClass="source"> + class for all Prado pages.
+ </p> +<com:TTextHighlighter Language="php" CssClass="source block-content" id="code3"> <?php class Home extends TPage { - + } ?> -</com:TTextHighlighter> +</com:TTextHighlighter>
+ <p id="1111" class="block-content"> Prado uses PHP's <tt>__autoload</tt> method to load classes. The convention - is to use the class name with ".php" extension as filename. + is to use the class name with ".php" extension as filename. </p> - - <p>So far there is nothing interesting about Prado, we just declared some + + <p id="80064" class="block-content">So far there is nothing interesting about Prado, we just declared some "web components" in some template file named Home.page and created a "Home.php" file with a <tt>Home</tt> class. The more interesting bits are in Prado's event-driven architecture as we shall see next. </p> - - <p>We want that when the user click on the "Convert" button, we take the + + <p id="80065" class="block-content">We want that when the user click on the "Convert" button, we take the values in the textbox, do some calculation and present the user with the converted total. To handle the user clicking of the "Convert" button we simply add an <tt>OnClick</tt> property to the "Convert" button in - the "Home.page" template and add a corresponding event handler method - in the "Home.php". -<com:TTextHighlighter Language="prado" CssClass="source"> + the "Home.page" template and add a corresponding event handler method + in the "Home.php".
+ </p> +<com:TTextHighlighter Language="prado" CssClass="source block-content" id="code4"> <com:TButton Text="Convert" OnClick="convert_clicked" /> -</com:TTextHighlighter> +</com:TTextHighlighter> + <p id="222" class="block-content">
The value of the <tt>OnClick</tt>, "<tt>convert_clicked</tt>", will be the method - name in the "Home.php" that will called when the user clicks on the - "Convert" button. -<com:TTextHighlighter Language="php" CssClass="source"> + name in the "Home.php" that will called when the user clicks on the + "Convert" button.
+ </p> +<com:TTextHighlighter Language="php" CssClass="source block-content" id="code5"> class Home extends TPage { public function convert_clicked($sender, $param) @@ -164,67 +171,78 @@ class Home extends TPage $this->total->Text = $rate * $dollars; } } -</com:TTextHighlighter> +</com:TTextHighlighter>
+<div id="3332" class="block-content">
+ <p id="333"> If you run the application in your web browser, enter some values and click the "Convert" button then you should see that calculated value displayed next to the "Amount in Other Currency" label. </p> - - <p>In the "<tt>convert_clicked</tt>" method the first parameter, <tt>$sender</tt>, - corresponds to the object that raised the event, in this case, + + <p id="80066">In the "<tt>convert_clicked</tt>" method the first parameter, <tt>$sender</tt>, + corresponds to the object that raised the event, in this case, the "Convert" button. The second parameter, <tt>$param</tt> contains any additional data that the <tt>$sender</tt> object may wish to have added. </p> - - <p>We shall now examine, the three lines that implements the simply currency - conversion in the "<tt>convert_clicked</tt>" method. -<com:TTextHighlighter Language="php" CssClass="source"> -$rate = floatval($this->currencyRate->Text); -</com:TTextHighlighter> + + <p id="80067">We shall now examine, the three lines that implements the simply currency + conversion in the "<tt>convert_clicked</tt>" method.
+ </p>
+</div> +<com:TTextHighlighter Language="php" CssClass="source block-content" id="code6" > +$rate = floatval($this->currencyRate->Text); +</com:TTextHighlighter>
+ <p id="444" class="block-content"> The statement <tt>$this->currencyRate</tt> corresponds to the <tt>TTextBox</tt> component with <tt>ID</tt> value "currencyRate" in the "Home.page" template. The <tt>Text</tt> property of the <tt>TTextBox</tt> contains the value that the user entered. So, we obtain this value by <tt>$this->currencyRate->Text</tt> which we convert the - value to a float value. -<com:TTextHighlighter Language="php" CssClass="source"> -$dollars = floatval($this->dollars->Text); -</com:TTextHighlighter> + value to a float value.
+ </p> +<com:TTextHighlighter Language="php" CssClass="source block-content" id="code7"> +$dollars = floatval($this->dollars->Text); +</com:TTextHighlighter>
+<div id="5551" class="block-content">
+ <p id="555"> The next line does a similar things, it takes the user value from - the <tt>TTextBox</tt> with <tt>ID</tt> value "dollars and converts it to + the <tt>TTextBox</tt> with <tt>ID</tt> value "dollars and converts it to a float value. </p> - - <p>The third line calculates the new amount and set this value in the + + <p id="80068">The third line calculates the new amount and set this value in the <tt>Text</tt> property of the <tt>TLabel</tt> with <tt>ID="total"</tt>. - Thus, we display the new amount to the user in the label. -<com:TTextHighlighter Language="php" CssClass="source"> -$this->total->Text = $rate * $dollars; -</com:TTextHighlighter> + Thus, we display the new amount to the user in the label.
</p> - - <h1>Adding Validation</h1> - <p>The way we convert the user entered value to float ensures that the - total amount is always a number. So the user is free to enter what +</div>
+<com:TTextHighlighter Language="php" CssClass="source block-content" id="code8"> +$this->total->Text = $rate * $dollars; +</com:TTextHighlighter> + + <h1 id="16005">Adding Validation</h1> + <p id="80069" class="block-content">The way we convert the user entered value to float ensures that the + total amount is always a number. So the user is free to enter what ever they like, they could even enter letters. The user's experience in using the application can be improved by adding validators - to inform the user of the allowed values in the currency rate and the + to inform the user of the allowed values in the currency rate and the amount to be calcuated. </p> - - <p>For the currency rate, we should ensure that - <ol> + + <p id="80070">For the currency rate, we should ensure that</p> + <ol id="o111" class="block-content"> <li>the user enters a value,</li> - <li>the currency rate is a valid number,</li> + <li>the currency rate is a valid number,</li> <li>the currency rate is positive.</li> - </ol> - To ensure 1 we add one - <com:DocLink ClassPath="System.Web.UI.WebControls.TRequiredFieldValidator" Text="TRequiredFieldValidator" />. To ensure 2 and 3, we add one + </ol>
+ <p id="666" class="block-content"> + To ensure 1 we add one + <com:DocLink ClassPath="System.Web.UI.WebControls.TRequiredFieldValidator" Text="TRequiredFieldValidator" />. To ensure 2 and 3, we add one <com:DocLink ClassPath="System.Web.UI.WebControls.TCompareValidator" Text="TCompareValidator" />. We may add these validators any where within the "Home.page" template. Further details regarding these validator and other - validators can be found in the - <a href="?page=Controls.Validation">Validation Controls</a> page. -<com:TTextHighlighter Language="prado" CssClass="source"> + validators can be found in the + <a href="?page=Controls.Validation">Validation Controls</a> page.
+ </p> +<com:TTextHighlighter Language="prado" CssClass="source block-content" id="code9"> <com:TRequiredFieldValidator ControlToValidate="currencyRate" ErrorMessage="Please enter a currency rate." /> @@ -235,18 +253,19 @@ $this->total->Text = $rate * $dollars; Operator="GreaterThan" ErrorMessage="Please enter a positive currency rate." /> </com:TTextHighlighter> - </p> - - <p>For the amount to be calculated, we should ensure that - <ol> + + <p id="80071" >For the amount to be calculated, we should ensure that</p> + <ol id="o222" class="block-content"> <li>the user enters a value,</li> <li>the value is a valid number (not including any currency or dollar signs).</li> - </ol> + </ol>
+ <p id="777" class="block-content"> To ensure 1 we just add another <tt>TRequiredFieldValidator</tt>, for 2 we could use a <com:DocLink ClassPath="System.Web.UI.WebControls.TDataTypeValidator" Text="TDataTypeValidator" />. For simplicity we only allow the user to enter - a number for the amount they wish to convert. -<com:TTextHighlighter Language="prado" CssClass="source"> + a number for the amount they wish to convert.
+ </p> +<com:TTextHighlighter Language="prado" CssClass="source block-content" id="code9a"> <com:TRequiredFieldValidator ControlToValidate="dollars" ErrorMessage="Please enter the amount you wish to calculate." /> @@ -256,16 +275,17 @@ $this->total->Text = $rate * $dollars; ErrorMessage="Please enter a number." /> </com:TTextHighlighter> </p> - - <p>Now if you try to enter some invalid data in the application or left out + + <p id="80072" class="block-content">Now if you try to enter some invalid data in the application or left out any of the fields the validators will be activated and present the user with error messages. Notice that the error messages are presented without reloading the page. Prado's validators by default validates using both javascript and server side. The server side validation is <b>always performed</b>. For the server side, we - should skip the calculation if the validators are not satisfied. This can - done as follows. -<com:TTextHighlighter Language="php" CssClass="source"> + should skip the calculation if the validators are not satisfied. This can + done as follows.
+ </p> +<com:TTextHighlighter Language="php" CssClass="source block-content" id="code10" > public function convert_clicked($sender, $param) { if($this->Page->IsValid) @@ -274,42 +294,43 @@ public function convert_clicked($sender, $param) $dollars = floatval($this->dollars->Text); $this->total->Text = $rate * $dollars; } -} -</com:TTextHighlighter> - </p> - - <h1>Improve User Experience With Active Controls</h1> - <p>In this simple application we may further improve the user experience +} +</com:TTextHighlighter> + + <h1 id="16006">Improve User Experience With Active Controls</h1> + <p id="80073" class="block-content">In this simple application we may further improve the user experience by decreasing the responsiveness of the application. One way to achieve a faster response is calculate and present the results without reloading the whole page. </p> - - <p>We can replace the <tt>TButton</tt> with the Active Control counter part, + + <p id="80074" class="block-content">We can replace the <tt>TButton</tt> with the Active Control counter part, <com:DocLink ClassPath="System.Web.UI.ActiveControls.TActiveButton" Text="TActiveButton" />, that can trigger a server side click event without reloading the page. - In addition, we can change the "totals" <tt>TLabel</tt> with the - Active Control counter part, + In addition, we can change the "totals" <tt>TLabel</tt> with the + Active Control counter part, <com:DocLink ClassPath="System.Web.UI.ActiveControls.TActiveLabel" Text="TActiveLabel" />, such that the server side can update the browser without - reloading the page. -<com:TTextHighlighter Language="prado" CssClass="source"> + reloading the page.
+ </p> +<com:TTextHighlighter Language="prado" CssClass="source block-content" id="code11"> <div class="total-field"> <span class="total-label">Amount in Other Currency:</span> <com:TActiveLabel ID="total" CssClass="result" /> </div> <div class="convert-button"> <com:TActiveButton Text="Convert" OnClick="convert_clicked" /> -</div> -</com:TTextHighlighter> +</div> +</com:TTextHighlighter>
+ <p id="1232" class="block-content"> The server side logic remains the same, we just need to import the Active Controls name space as they are not included by default. We - add the following line to the begin of "Home.php". -<com:TTextHighlighter Language="php" CssClass="source"> -Prado::using('System.Web.UI.ActiveControls.*'); -</com:TTextHighlighter> + add the following line to the begin of "Home.php".
</p> - - <p>If you try the application now, you may notice that the page no longer +<com:TTextHighlighter Language="php" CssClass="source block-content" id="code12"> +Prado::using('System.Web.UI.ActiveControls.*'); +</com:TTextHighlighter> + + <p id="80075" class="block-content">If you try the application now, you may notice that the page no longer needs to reload to calculate and display the converted total amount. However, since there is not page reload, there is no indication or not obvious that by clicking on the "Convert" button any has happened. @@ -317,59 +338,61 @@ Prado::using('System.Web.UI.ActiveControls.*'); to "calculating..." when the user clicks on the "Convert" button. The text of the "total" label will still be updated with the new calculate amount as before. </p> - - <p>To indicate that the calculation is in progress, we can change the text + + <p id="80076" class="block-content">To indicate that the calculation is in progress, we can change the text of the "total" label as follows. We add a <tt>ClientSide.OnLoading</tt> property to the "Convert" button (since this button is responsible for requesting - the calculation). -<com:TTextHighlighter Language="prado" CssClass="source"> + the calculation).
+ </p> +<com:TTextHighlighter Language="prado" CssClass="source block-content" id="code13"> <com:TActiveButton Text="Convert" OnClick="convert_clicked" > <prop:ClientSide.OnLoading> $('<%= $this->total->ClientID %>').innerHTML = "calculating..." </prop:ClientSide.OnLoading> -</com:TActiveButton> +</com:TActiveButton> </com:TTextHighlighter> - </p> - - <p>The <tt>ClientSide.OnLoading</tt> and various - <com:DocLink ClassPath="System.Web.UI.ActiveControls.TCallbackClientSide" Text="other properties" /> accept a javascript block as their content or value. - The javascript code <tt>$('...')</tt> is a javascript function that is + + <p id="80077" class="block-content">The <tt>ClientSide.OnLoading</tt> and various + <com:DocLink ClassPath="System.Web.UI.ActiveControls.TCallbackClientSide" Text="other properties" /> accept a javascript block as their content or value. + The javascript code <tt>$('...')</tt> is a javascript function that is equivalent to <tt>document.getElementById('...')</tt> that takes a string with the ID of an HTML element. Since Prado renders its components's IDs, we need to use the rendered ID of the "total" label, that is, <tt>$this->total->ClientID</tt>. We place this bit of code within a <tt><%= %></tt> to obtain the rendered HTML ID for the "total" label. The rest of the javascript code <tt>innerHTML = "calculating..."</tt> simply changes the content of the "total" label. </p> - - <h1>Adding Final Touches</h1> - <p>So far we have built a simple currency converter web application with + + <h1 id="16007">Adding Final Touches</h1> + <p id="80078" class="block-content">So far we have built a simple currency converter web application with little attention of the looks and feel. Now we can add a stylesheet to improve the overall appearance of the application. We can simply add the stylesheet inline with the template code or we may create a "theme". </p> - - <p>To create and use a theme with Prado applications, we simply create a new + + <p id="80079" class="block-content">To create and use a theme with Prado applications, we simply create a new directory "themes/Basic" in the <tt>currency-converter</tt> directory. You may need to create the <tt>themes</tt> directory first. Any directory within the <tt>themes</tt> are considered as a theme with the - name of the theme being the directory name. See the + name of the theme being the directory name. See the <a href="?page=Advanced.Themes">Themes and Skins</a> for further details. </p> - - <p>We simply create a CSS file named "common.css" and save it in the + + <p id="80080" class="block-content">We simply create a CSS file named "common.css" and save it in the <tt>themes/Basic</tt> directory. Then we add the following code - to the beginning of "Home.page" (we add a little more HTML as well). -<com:TTextHighlighter Language="prado" CssClass="source"> + to the beginning of "Home.page" (we add a little more HTML as well).
+ </p> +<com:TTextHighlighter Language="prado" CssClass="source block-content" id="code14"> <%@ Theme="Basic" %> -<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" > <com:THead Title="Currency Converter" /> -<body> -</com:TTextHighlighter> - The first line <tt><%@ Theme="Basic" %></tt> defines the - theme to be used for this page. The +<body> +</com:TTextHighlighter>
+ <p id="4334" class="block-content"> + The first line <tt><%@ Theme="Basic" %></tt> defines the + theme to be used for this page. The <com:DocLink ClassPath="System.Web.UI.WebControls.THead" Text="THead" /> corresponds to the HTML <tt><head></tt> element. In addition to display the <tt>Title</tt> property by the <tt>THead</tt>, all CSS |