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In this case, the code can be used both client- and server-side Just for variety, let s then reuse it; we have already used JSNI (with MD5) and JCA (again with MD5), so now we ll opt for sharing the same code Note that the same codeDecode() method is used for both encoding and decoding To always transmit ASCII legible characters (that will make debugging easier!) let s add a pair of utility methods to our Security package The first, byteStringToHexString() will convert a String formed by any bytes, to a Hex equivalent; for example, AtoZ\n would become 41746f5a0a, which contains only digits and letters To revert the effects of this, let s also have hexStringToByteString() The source code can be used both client- and server-side, so that means less coding

To assign the table mapping styleusing datasetsset the MappingName of the DataGridTableStyle to the table inside the dataset This is different with other sources of data To use the TableStyles mapping with an array list, the MappingName must to be set to the type name ArrayList To map the columns of the datagrid to custom objects in the array list, set the MappingName of the GridColumnStyle to the name of the property of the class (for example, Title or Number for the Course class)

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he problem with the standard widgets available in the HTML toolkit (such as text boxes, radio buttons, and so on) isn t that they are ineffective themselves: It s that there just aren t enough of themThere are certain functions for which the standard widgets are a perfect fit And in those functions they find their proper homesThe purpose of a widget is to represent some piece of data or process to the userThe degree to which the widget corresponds to the user s model of that data or process determines it success When widget form and function correspond, the user interface can seem to become almost transparent, and users no longer perceive themselves as working through widgets but as working with their content directlyThis chapter describes a number of Dojo widgets that each perform a specialized function to which they are perfectly matched

private void OnGetCourses(object sender, SystemEventArgs e) { Category category = (Category)thiscomboBoxCategoriesSelectedItem; using (QueryCourseControl cc = new QueryCourseControl()) { courses = ccGetCourses( CourseSelectionByCategoryAndDates(category, dateTimePickerStartDateValue, dateTimePickerEndDateValue)); thisdataGridCoursesDataSource = courses; } }

The widgets described in this chapter each have some unique functionThey are not necessarily the most advanced or complicated of the Dojo widgets, but because of their uniqueness they have been grouped togetherThere is no other unifying theme to tie them together as there was with the form widgets described in 7, Dojo Form Widgets, or the layout widgets described in 8, Dojo Layout Widgets However, we re not entering terra incognita here Although the specific function of the widgets might be unique, they way we construct them and use them will be quite

public class Security { public static String byteStringToHexString(final String s) { String r = ""; for (int i = 0; i < slength(); i++) { r += byteToHexChars(scharAt(i)); } return r; } // Convert a number (0255) into its two-character equivalent // For example, 15 returns "0F" and 100 returns "64" public static String byteToHexChars(final int i) { final String s = "0" + IntegertoHexString(i); return ssubstring(slength() - 2); }

Listing 15-13 shows the OnSelectCourse method that is the handler of the Click event from the datagrid dataGridCourses When a course is selected, this method is called to display all course dates associated with the course The selected course is calculated with the row index of the datagrid, and then the CourseDates property of this course is set to the DataSource of the second datagrid dataGridCourseDates, so that all dates are shown The mapping with the second datagrid is done in a similar way to the mapping of the first datagrid

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public static String hexStringToByteString(final String s) { String r = ""; for (int i = 0; i < slength(); i += 2) { r += (char) IntegerparseInt(ssubstring(i, i + 2), 16); } return r; }

private void OnSelectCourse(object sender, SystemEventArgs e) { string courseNumber = (string)thisdataGridCourses[ thisdataGridCoursesCurrentRowIndex, 0]; Course selectedCourse = (Course)courses[ thisdataGridCoursesCurrentRowIndex];

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