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DropDownList

cascadeFromFieldString

Defines the field to be used to filter the data source. If not defined the parent's dataValueField option will be used. Help topic showing how cascading functionality works

Example 

<input id="parent" />
<input id="child" />
<script>
$("#parent").kendoDropDownList({
    dataTextField: "name",
    dataValueField: "id",
    dataSource: [
        { name: "Parent1", id: 1 },
        { name: "Parent2", id: 2 }
    ]
});

$("#child").kendoDropDownList({
    cascadeFrom: "parent",
    cascadeFromField: "parentId",
    dataTextField: "name",
    dataValueField: "id",
    dataSource: [
        { name: "Child1", id: 1, parentId: 1 },
        { name: "Child2", id: 2, parentId: 2 },
        { name: "Child3", id: 3, parentId: 1 },
        { name: "Child4", id: 4, parentId: 2 }
    ]
});
</script>
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cascadeFromField
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