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SP.RelatedField Class

SharePoint 2010

Specifies a relationship to a lookup field.

SP.RelatedField

The following example creates an input button on an application page that displays the Id of fields related to the Tasks list of the current site.

<asp:Content ID="Main" ContentPlaceHolderID="PlaceHolderMain" runat="server">
<script type="text/ecmascript" language="ecmascript">

    var relatedFieldCollection = null;

    function runCode() {

        var clientContext = new SP.ClientContext.get_current();
        if (clientContext != undefined && clientContext != null) {

            this.web = clientContext.get_web();
            var listCollection = web.get_lists();
            var item = listCollection.getByTitle("Tasks");
            // Get a collection of lookup fields that use this list as a data source 
            // and that have FieldLookup.IsRelationship set to true.
            this.relatedFieldCollection = item.getRelatedFields();

            clientContext.load(this.relatedFieldCollection);

            clientContext.executeQueryAsync(Function.createDelegate(this, this.onQuerySucceeded), Function.createDelegate(this, this.onQueryFailed));
        }
    }

    function onQuerySucceeded(sender, args) {
        var fieldInfo = '';
        var fieldEnumerator = this.relatedFieldCollection.getEnumerator();
        while (fieldEnumerator.moveNext()) {
            var relatedField = fieldEnumerator.get_current();
            // Get the GUID that identifies the related lookup field.
            fieldInfo += 'Related Field ID: ' + relatedField.get_fieldId().toString() + '\n';
        }
        alert(fieldInfo);
    }

    function onQueryFailed(sender, args) {
        alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());
    }

</script>

    <input id="Button1" type="button" value="Run Code" onclick="runCode()" />

</asp:Content>

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