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Filter Builder - Customization

In this demo, a custom filter operation, "anyof", is implemented. The calculateFilterExpression function converts it into DataSource-compatible operations. The compatible and incompatible filter expressions are displayed under the FilterBuilder.

The set of available group operations is limited to "and" and "or" using the groupOperations array, and the groups’ maximum nesting level is limited to one using the maxGroupLevel.

Backend API
@{ var value = new object[] { new object[] { "Category", "anyof", new[] { "Automation", "Monitors" } }, "or", new object[] { new object[] { "Category", FilterBuilderFieldFilterOperations.Equal, "Televisions" }, "and", new object[] { "Price", "between", new[] { 2000, 4000 } } } }; var categories = new[] { "Video Players", "Televisions", "Monitors", "Projectors", "Automation" }; } @(Html.DevExtreme().FilterBuilder() .ID("filterBuilder") .Fields(fields => { fields.Add().DataField("Name"); fields.Add().DataField("Price") .DataType(FilterBuilderFieldDataType.Number) .Format(Format.Currency); fields.Add().DataField("CurrentInventory") .DataType(FilterBuilderFieldDataType.Number) .Caption("Inventory"); fields.Add().DataField("Category") .FilterOperations(new[] { "=", "anyof" }) .Lookup(l => l.DataSource(categories)); }) .Value(value) .MaxGroupLevel(1) .GroupOperations(new[] { FilterBuilderGroupOperations.And, FilterBuilderGroupOperations.Or }) .OnValueChanged("filterBuilder_updateTexts") .OnInitialized("filterBuilder_updateTexts") .CustomOperations(o => { o.Add() .Name("anyof") .Caption("Is any of") .Icon("check") .EditorTemplate(@<text>@( Html.DevExtreme().TagBox() .Value(new JS("value")) .Items(categories) .InputAttr("aria-label", "Category") .OnValueChanged(@"function(e) { setValue(e.value && e.value.length ? e.value : null); }") .Width("auto") )</text>) .CalculateFilterExpression("tagBox_calculateFilterExpression"); }) ) <div class="results"> <div> <b>Value</b> <pre id="filterText"></pre> </div> <div> <b>DataSource's filter expression</b> <pre id="dataSourceText"></pre> </div> </div> <script> function tagBox_calculateFilterExpression(filterValue, field) { return filterValue && filterValue.length && Array.prototype.concat.apply([], filterValue.map(function (value) { return [[field.dataField, "=", value], "or"]; })).slice(0, -1); } function filterBuilder_updateTexts(e) { $("#filterText").text(formatValue(e.component.option("value"))); $("#dataSourceText").text(formatValue(e.component.getFilterExpression())); } function formatValue(value, spaces) { if (value && Array.isArray(value[0])) { var TAB_SIZE = 4; spaces = spaces || TAB_SIZE; return "[" + getLineBreak(spaces) + value.map(function (item) { return Array.isArray(item[0]) ? formatValue(item, spaces + TAB_SIZE) : JSON.stringify(item); }).join("," + getLineBreak(spaces)) + getLineBreak(spaces - TAB_SIZE) + "]"; } return JSON.stringify(value); } function getLineBreak(spaces) { return "\r\n" + new Array(spaces + 1).join(" "); } </script>
using DevExtreme.NETCore.Demos.Models.SampleData; using Microsoft.AspNetCore.Mvc; namespace DevExtreme.NETCore.Demos.Controllers { public class FilterBuilderController : Controller { public ActionResult Customization() { return View(); } } }
.results { margin-top: 50px; display: flex; justify-content: space-between; } .results > div { flex-basis: 49%; max-width: 50%; background-color: rgba(191, 191, 191, 0.15); position: relative; } .results b { position: absolute; top: -25px; } .results pre { padding: 10px 20px; height: 100%; font-size: 13px; overflow: auto; box-sizing: border-box; } .dx-tagbox { min-width: 150px; } .dx-filterbuilder { background-color: transparent; box-shadow: 0 8px 16px 0 rgba(0, 0, 0, 0.14), 0 0 2px 0 rgba(0, 0, 0, 0.12); border-radius: 6px; padding: 15px; } .dx-filterbuilder .dx-numberbox { width: 80px; }