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4
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Client Object Model
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As you saw in the preceding code snippets, although the Client Object Model defines clientside representations of server objects and we can create instances of those objects in our code, the objects are not populated with a copy of the server-side data until it is explicitly loaded
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private void CAMLQUery_Click(object sender, RoutedEventArgs e) { ClientContext ctx = new ClientContext("Your site here"); CamlQuery query = new CamlQuery(); queryViewXml = "<View><Query><OrderBy> <FieldRef Name=\"Editor\" Ascending=\"False\" /> </OrderBy></Query></View>"; List announcements = ctxWebListsGetByTitle("Announcements"); FieldCollection fields = announcementsFields; ctxLoad(fields); ListItemCollection listItems = announcementsGetItems(query); ctxLoad(listItems); ctxExecuteQueryAsync((s, args) => { DispatcherBeginInvoke(() => { BuildTable(fields, listItems); }); }, (s, args) => { DispatcherBeginInvoke(() => { label1Content = argsMessage; }); }); }
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To perform the same function using JavaScript, you can use this:
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function CAMLQuery_Click() { var ctx = new SPClientContextget_current(); var query = new SPCamlQuery(); queryviewXml = "<View><Query><OrderBy> <FieldRef Name=\"Editor\" Ascending=\"False\" /> </OrderBy></Query></View>"; var announcements = ctxget_web()get_lists()getByTitle("Announcements"); var listItems = announcementsgetItems(query); ctxload(listItems); var fields = announcementsget_fields(); ctxload(fields); ctxexecuteQueryAsync(function (s, args) {
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Part II
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This Silverlight code snippet shows how to execute a Collaborative Application Markup Language (CAML) query against a list:
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PART II
Presentation Layer
var console = documentgetElementById('DemoConsole'); consoleinnerHTML = buildTable(fields,listItems); }, null);
The important thing to note about these code samples is the use of the ClientContextLoad method This method flags the passed in object to be populated the next time ExecuteQueryAsync is called, so in the preceding example, ctxLoad(listItems) will flag the listItems object for population To use these code snippets with the demo project that we set up earlier, take the following steps first, for the Silverlight sample: 1 Add a new button labeled Execute CAML Query to MainPagexaml, and set the Click event handler to CAMLQuery_Click 2 Add the Silverlight code snippet listed above into MainPagexamlcs 3 Add a ScrollViewer control to MainPagexaml and then, inside the ScrollViewer, add a Grid control named grid1 4 Add the following code into MainPagexamlcs:
void BuildTable(FieldCollection fields, ListItemCollection listItems) { grid1RowDefinitionsClear(); grid1ColumnDefinitionsClear(); grid1ShowGridLines = false; grid1RowDefinitionsAdd(new RowDefinition { Height=new GridLength(0,GridUnitTypeAuto)}); int i = 0; foreach (var field in fields) { if (!fieldHidden) { grid1ColumnDefinitionsAdd(new ColumnDefinition { Width=new GridLength(0,GridUnitTypeAuto) }); TextBlock label = new TextBlock { Text = fieldTitle, HorizontalAlignment = HorizontalAlignmentCenter, FontWeight = FontWeightsBold, Margin = new Thickness(10, 0, 10, 0), }; labelSetValue(GridRowProperty, 0); labelSetValue(GridColumnProperty, i); grid1ChildrenAdd(label); i++; } } int row = 1; foreach (var item in listItems) { i = 0; grid1RowDefinitionsAdd(new RowDefinition {
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Client Object Model
Height=new GridLength(0,GridUnitTypeAuto)}); foreach (var field in fields) { if (!fieldHidden) { TextBlock label = new TextBlock { HorizontalAlignment = HorizontalAlignmentCenter, Margin = new Thickness(10, 0, 10, 0), }; try { labelText = item[fieldStaticName]ToString(); } catch (Exception) { labelText = "--"; } labelSetValue(GridRowProperty, row); labelSetValue(GridColumnProperty,i); i++; grid1ChildrenAdd(label); } } row++;
5 Build the SilverlightCOMDemo project Now, for the JavaScript sample, do the following: 1 Using SharePoint Designer, modify JavascriptTestaspx to include an additional button 2 Above the DemoConsole div tag that we added earlier, insert the following markup:
<input name="Button2" type="button" value="Execute CAML Query" onclick="CAMLQuery_Click()"></input>
6 Within the JScriptTestjs file in our SharePoint project, add the CAMLQuery_Click JavaScript sample method listed above and then add the following function:
function buildTable(fields,listItems) { var output = ""; output = "<table><thead style=\"font-weight:bold\"><tr>"; var fieldEnum = fieldsgetEnumerator(); while (fieldEnummoveNext()) { var field = fieldEnumget_current(); if (fieldget_hidden() != true) { output += "<td>" + fieldget_title() + "</td>"; } } output += "</tr></thead>"; var enumerator = listItemsgetEnumerator(); while (enumeratormoveNext()) {
Part II
PART II
Presentation Layer
} output += "</table>" return output;
var item = enumeratorget_current(); fieldEnumreset(); output += "<tr>"; while (fieldEnummoveNext()) { var field = fieldEnumget_current(); if (fieldget_hidden() != true) { try { output += "<td>" + itemget_item(fieldget_staticName()) + "</td>"; } catch (e) { output += "<td>--</td>"; } } } output += "</tr>";
With these changes in place, by deploying the solution, we can view the results of our CAML query as a table using either the Silverlight test page or the JavaScript test page that we added earlier in the chapter
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