Questions regarding breadcrumbs/title in my custom visual

You should implement enumerateObjectInstances method in the class that implements IVisual interface.

Basic implementation might look something like this:

enumerateObjectInstances?(options: EnumerateVisualObjectInstancesOptions): VisualObjectInstanceEnumeration {
    return [];
}

Ignat Vilesov,

Software Engineer

Microsoft Power BI Custom Visuals

[email protected]

Pfff that was a while ago :) I looked in my code and I think for me this did the job!

Add an additional file : objectEnumerationUtility.ts to the project with the following code: 

module powerbi.extensibility.visual {
/**
* Gets property value for a particular object.
*
* @function
* @param {DataViewObjects} objects - Map of defined objects.
* @param {string} objectName - Name of desired object.
* @param {string} propertyName - Name of desired property.
* @param {T} defaultValue - Default value of desired property.
*/
export function getValue<T>(objects: DataViewObjects, objectName: string, propertyName: string, defaultValue: T ): T {
if (objects) {
let object = objects[objectName];
if (object) {
let property: T = <T>object[propertyName];
if (property !== undefined) {
return property;
}
}
}
return defaultValue;
}

/**
* Gets property value for a particular object in a category.
*
* @function
* @param {DataViewCategoryColumn} category - List of category objects.
* @param {number} index - Index of category object.
* @param {string} objectName - Name of desired object.
* @param {string} propertyName - Name of desired property.
* @param {T} defaultValue - Default value of desired property.
*/
export function getCategoricalObjectValue<T>(category: DataViewCategoryColumn, index: number, objectName: string, propertyName: string, defaultValue: T): T {
let categoryObjects = category.objects;

if (categoryObjects) {
let categoryObject: DataViewObject = categoryObjects[index];
if (categoryObject) {
let object = categoryObject[objectName];
if (object) {
let property: T = <T>object[propertyName];
if (property !== undefined) {
return property;
}
}
}
}
return defaultValue;
}
}

Then update visual.ts 

add this fuction:

/**
* Enumerates through the objects defined in the capabilities and adds the properties to the format pane
*
* @function
* @param {EnumerateVisualObjectInstancesOptions} options - Map of defined objects
*/

public enumerateObjectInstances(options: EnumerateVisualObjectInstancesOptions): VisualObjectInstanceEnumeration {
let objectName = options.objectName;
let objectEnumeration: VisualObjectInstance[] = [];

return objectEnumeration;
}

My contructor looked like this:

constructor(options: VisualConstructorOptions) {
this.mainContainer = $('<div>');
this.host = options.host;
this.selectionManager = options.host.createSelectionManager();

$(options.element)

.append(this.mainContainer);

}