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Custom List of Filter Functions for Custom Field Editor

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Filter

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14 Answers, 1 is accepted

answered on 04 Jun 2010, 02:24 PM

Hi Iana,

We've used the localization features to rename the filtering functions to more reader-friendly versions. However, we'd like to customize the items that appear in the list. For instance, in the first look demo for the RadFilter, that list is different for different fields in the filter. The OrderDate field doesn't contain some of the items (IsEmpty, NotIsEmpty, etc.) the ShipName field does. I'm assuming this is because those two fields use different field editors - presumably, the RadFilterTextFieldEditor and the RadFilterDateFieldEditor. I'd like to know how to customize that list for our custom field editor (which we modeled after the RadFilterComboBoxEditor in the post linked above).

answered on 07 Jun 2010, 02:53 PM

Hi,

What items will be displayed in the filtering menu for the particular editor depends on the DataType property of the editor. For instance if it is System.String, the filer menu would have an option Contains but if the DataType is Int32, it will not have a Contains option. And what the specific field editor determines is the type of the input field - CheckBox, TextBox, DatePicker or NumericTextBox for instance.

However, can you elaborate on the way you what to customize the filtering menu? Do you want to reduce its items or to add custom ones for custom filters handling?

Greetings,
Iana
the Telerik team

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answered on 09 Jun 2010, 05:22 PM

filterfunctiondropdown.png

Iana,

Thanks for letting me know the field's data type determines the list of filter functions available. To answer your question, I would like to reduce the number of items in that list for the custom RadFilterComboBoxEditor I've built. The DataType of the editor is String. I've attached a list of the options currently available in the filter funtion list. I'd like to reduce that list to contain only 4 of the items: equal to, not equal to, is null, is not null.

Changing the list here for the RadFilterComboBoxEditor should not effect the default options for the RadFilterTextFieldEditor.

Accepted

answered on 10 Jun 2010, 12:21 PM

reduceradfiltermenuitems.zip

Hi Ross,

To reduce the RadFilter filter menu items, you need to handle the menu OnShowing client-side event and set the odd items as invisible. You can find the filter menu in the OnFilterCreated client-side event handler:

<telerik:RadCodeBlock ID="RadCodeBlock1" runat="server">

<script type="text/javascript">

function FilterCreated(sender, eventArgs) {

var filterMenu = sender.get_contextMenu();

filterMenu.add_showing(FilterMenuShowing);

}

function FilterMenuShowing(sender, eventArgs) {

var filter = $find("<%= RadFilter1.ClientID %>");

var currentExpandedItem = sender.get_attributes()._data.ItemHierarchyIndex;

if (filter._expressionItems[currentExpandedItem] == "ContactTitle") {

sender.findItemByValue("IsNull").set_visible(false);

sender.findItemByValue("NotIsNull").set_visible(false);

}

if (filter._expressionItems[currentExpandedItem] == "Country") {

sender.findItemByValue("GreaterThan").set_visible(false);

sender.findItemByValue("LessThan").set_visible(false);

}

</script>

</telerik:RadCodeBlock>

I am also attaching a runnable sample illustrating the suggested approach.

Best wishes,
Iana
the Telerik team