topic Re: How to define Table DataViewMappings in Developer

How to define Table DataViewMappings

Sreejith — Sun, 22 May 2016 18:11:01 GMT

Hi,

I want to make a custom visual with just two columns, one for text and other for a link button.

Ho can I define the dataview model.? I couldnot find any doc that defines a dataview for Table like one for Categorical

dataViewMappings: [{
categorical(Table?): {
categories: {
for: { in: 'Category' },
dataReductionAlgorithm: { top: {} }
},
values: {
select: [{ bind: { to: 'Message' } }]
},
}
}],

How can I achieve this?

Thank you.

Re: How to define Table DataViewMappings

Greg_Deckler — Sun, 22 May 2016 18:54:43 GMT

I am not aware of a way to have a link button in a visual currently.

Re: How to define Table DataViewMappings

Sreejith — Mon, 23 May 2016 10:09:04 GMT

@Greg_Deckler I could create a link button using SVG and on click it was redirecting.

this.htmlContents = d3.select(options.element.get(0)).append("svg")

.attr("width",400)

.attr("height", 200);

this.htmlContents.append("a").attr("xlink:href", "http://en.wikipedia.org/wiki/")

.append("rect")

.attr("x", 100)

.attr("y", 50)

.attr("height", 100)

.attr("width", 200)

.style("fill", "lightgreen")

.attr("rx", 10)

.attr("ry", 10);

this.htmlContents.append("text")

.attr("x", 200)

.attr("y", 100)

.style("fill", "black")

.style("font-size", "20px")

.attr("dy", ".35em")

.attr("text-anchor", "middle")

.style("pointer-events", "none")

.text("Resolve");

But when I added the same to a table cell, errror occurs "Refused to display "https://app/powerbi.com/www/wiki.org" in a frame because it set X-Frame-Opttions to deny

Re: How to define Table DataViewMappings

itayrom — Wed, 25 May 2016 13:47:40 GMT

Basically, if your dataRoles array is defined as follows:

dataRoles: [
	{
		displayName: 'Title',
		name: 'title',
		kind: powerbi.VisualDataRoleKind.Grouping
	},
	{
		displayName: 'Url',
		name: 'url',
		kind: powerbi.VisualDataRoleKind.Grouping
	}
]

Then your dataViewMappings array should look like this(I omitted the conditions[] array for clarity):

dataViewMappings: [{
    table: {
        rows: {
            select: [{for: { in: 'title' }},{for: { in: 'url' }}]
        }
    }
}]

The above will result in:

1. There will be two field wells displayed in Power BI, titled "Title" and "Url".

2. Your dataViews[index] object will have the following properties(among others...):

dataViews[index].table.columns[] array, which will contain that will contain some metadata about each column.
dataViews[index].table.rows[] array, which will contain arrays with values corresponding to the column indices.
dataViews[index].table.identities[] array, which will contain DataViewScopeIdentity objects corresponding to row numbers.
dataViews[index].table.identityFields[] array, which will contain the identityFields for each column.

Note that while the "columns" property is belongs to the table object, the other three are actually in its prototype.

A personal recommendation would be to log the dataView to the console and go through it yourself, and maybe play with the different mapping options. It's currently the best way I know to understand how these things work(Due to lack of documentation).

Also, note that you cannot have link buttons inside Power BI visuals. This is a security measure(called Sandboxing) taken by Microsoft, since it can be used to perform various malicious actions, such as Clickjacking and Cross-Site Scripting attacks, which is not something you want to be possible anywhere near your precious confidential corporate data.