how to generate barcode in asp.net using c# Figure 3-10. Trying to fit a column-proportional layout on a percentage layout in Font

Generating ANSI/AIM Code 39 in Font Figure 3-10. Trying to fit a column-proportional layout on a percentage layout

Figure 3-10. Trying to fit a column-proportional layout on a percentage layout
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The proportions used in the small browser are one column, one column, and one column. However, the bigger browser uses one column, two columns, and two columns. What you are doing is readjusting the space so that in the smaller window, only one column is illustrated. In the bigger window, more columns can be illustrated. The idea presented in Figure 3-10 is realized in Figure 3-11 as an algorithm that adjusts the number of columns within a table. Notice how the table cells in the larger and smaller window are allocated. Compare the proportions to Figure 3-9, and notice how the sizing of Figure 3-11 is more pleasing to the eye. From an implementation perspective, the solution to the resizing problem is to use an algorithm that calculates proportions on certain initial parameters.
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Figure 3-11. Sizing the cells proportionally within the table using a column width
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This recipe explains the solution in pieces, starting with the overall calling HTML page that calls the sizing algorithm, and then the sizing algorithm itself. The following code comprises the overall HTML page. Source: /website/ROOT/ajaxrecipes/dhtml/dynamiclayout.html <html> <head> <title>Dynamic Layout</title> <script language="JavaScript" src="/scripts/jaxson/common.js"></script> </head> <script language="JavaScript" type="text/javascript"> var flexbox; function updateClientArea() { flexbox.update(); } function InitializePage() { flexbox = new FlexBox("content"); flexbox.setCharacteristics({ col1 : { width : 200, maxCols : 1}, col2 : {width : 100, maxCols : 4}, col3 : { width :200}});
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flexbox.setContentCallback( { updateContent : function( cell, childElement, colCount, characteristic) { childElement.innerHTML = "Boxes (" + colCount + ") id(" + cell.id + ")"}}); flexbox.update(); window.onresize = updateClientArea; } </script> <body onload="InitializePage()"> <div id="content"> <div id="col1"></div> <div id="col2"></div> <div id="col3"></div> </div> </body> </html> Looking at the code for the HTML page, you can see that a type called FlexBox is instantiated and assigned to the global variable flexbox. The type FlexBox is the sizing algorithm. The action of instantiating and calling the FlexBox type is carried out in the function InitializePage, which is called by the body.onload event.2 You want to instantiate the FlexBox type in the body.onload event, because that is the first safe location for code to operate on a complete DOM model. When FlexBox is instantiated, it needs a constructor parameter; in the case of the example, that is the buffer "content". The buffer "content" is an ID reference to an HTML element that serves as the basis of the HTML elements that will be resized. In the example, the ID content references a div element, which contains child div elements. In this sizing algorithm, a div element references child div elements. In your implementation of this recipe, you don t need to do that. This sizing algorithm illustrates that an HTML element contains a number of content blocks, which serve as the columns that will be resized. When you assign an instance of FlexBox to flexbox, FlexBox first initializes itself and reorders the div elements into a table structure. Executing the FlexBox constructor causes it to reorder the div elements to the following HTML: <div id="content"> <table> <tr> <td id="col1"><div id="col1"></div></td> <td id="col2"><div id="col2"></div></td> <td id="col3"><div id="col3"></div></td> <tr> <table> </div>
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2. body.onload might not be appropriate for all situations, as it might cause the screen to jump around. Please see the following URL for further details: http://dean.edwards.name/weblog/2006/06/again/.
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The reordering of the HTML to a table element is a necessity. Two modes proportionally align elements on an HTML page: absolute coordinates and relative coordinates. By default, HTML uses relative coordinates, which the browser calculates. In relative coordinate mode, you only need to define which elements follow the other elements. Using absolute coordinates solves the problems of aligning the three child div elements, but the rest of the HTML page might be oddly aligned, as some elements might not use absolute coordinates. The simple way to align content on an HTML page using relative coordinates is to use a table. Thus, the sizing algorithm looks at the parent div element, creates a table, and creates a table cell for each child div element. Some readers might think that it would have been easier to define table rather div elements and then have the algorithm work with the table elements directly. It is true that using a table element would have been easier, but this algorithm illustrates how you can replace HTML elements with new HTML elements. Getting back to the source code of the calling HTML page, the method setCharacteristics is called once flexbox has been assigned. You pass an object definition with a number of embedded objects to setCharacteristics. The purpose of setCharacteristics is to define the proportional column widths of the child div elements. Thus, the embedded object has a number of properties that correspond one-to-one with the IDs of the child div elements. In the example, the embedded object defines the following restrictions: col1: Each column should be 200 pixels wide, and there is a maximum of only a single column. col2: Each column should be 100 pixels wide, and there is a maximum of four columns. col3: Each column should be 200 pixels wide, and there can be as many columns as there is space. To understand the restrictions, you need to understand the nature of the sizing algorithm. The idea of the sizing algorithm is to define proportions that allow a client application to order content appropriately. For example, in Figures 3-7 and 3-8, the structure of the content remains identical when the browser window is resized, even though the content is probably easier to read in Figure 3-8. Assuming Figure 3-8 is the ideal reading size, then the middle column that changes in width as the client browser changes in width is a single column width of x pixels. Let s compare Figure 3-8 with Figure 3-7, which has a middle area width of y pixels. A number of columns of x pixels wide in the middle area would be pleasing to the eye. The total number of columns that can be added is y/x. In terms of alignment, if the smaller browser contains content that can be described as being a box, then the larger browser can place those boxes side by side instead of in a single column, as illustrated in Figure 3-12. By increasing the width of the browser, you can assemble more blocks of content side by side. The readability of the HTML page is improved, because there is less scrolling, and the HTML page resembles that of a newspaper. The difference with the HTML page is that unlike a newspaper, the number of columns displayed depends on the size of the client window. The advantage is that if you look at the HTML page from the UMPC device or from a wide-screen notebook, you still get a good look and feel.
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