Engine API selecting a field value

[andyjalexlive]

Hi,

I've recently started to create Mashups using the Engine API. Can someone tell me how i select a value of a field in the Qlik sense app using the Engine API?

e.g. I have a field in my Qlik Sense App called CustomerID and i want to select where CustomerID = 1 

Many thanks

Andy

[ErikWetterberg]

Use GetField to get a field object,  then there are some different methods:

• SelectValues if you have the exact value
• LowLevelSelect if you know the index
• Select if you want to use wildcards etc

[andyjalexlive]

Thanks for your reply Eric 

I'm trying this but to no avail 

app.getField('CustomerID ')
.then((result) => result.selectValues(10000067)
)

error :

JSON parse error
at Intercept.errorResponseInterceptor (error-response-interceptor.js:1

Do you know what i'm doing wrong?

Thanks 
Andy

[beatYesterday]

 @ErikWetterberg ,

I am able to run the SelectValues after selecting a field in my app, and qReturn= true on response.  However, the table objects in my App are not filtered at all.  Are you able to explain how I can use this SelectValues method and then apply the field selections as a filter to an entire sheet or to a specific table object?  Thank you.

[andyjalexlive]

Hi 

After selectValues you need to get the result and then invoke a promise to reload your other objects. e.g.

let exampleVisualisationRender= new exampleVisualisation(exampleData)

...

object.selectValues( [
{qText: "1234", qIsNumeric: true, qNumber: 1234}

]).then((result) =>{

Promise.all([ExampleData.open()]).then(() => {
exampleVisualisationRender.init()

})})

Hope that helps 

Andy

[ErikWetterberg]

The first parameter should be an array.

[beatYesterday]

Thanks, @andyjalexlive   This reply helped a lot.  For other newcomers like myself while I read the documentation I did not realize a couple of things that prevented the SelectValues method from actually being applied.  Below are the points I (finally) figured out to solve this:

• Dates are stored as numeric values in Qlik.  This means if you are trying to filter by a date formatted like '2021/02/01'(YYYY-MM-DD), then you need to convert that into it's numeric value.  This numeric value is calculated in teh same way as in Excell, meaning it's just an incremental count of days since 1/1/1900. A simple google search will provide details for how to do this.

• When you are selecting a numeric value, that select match does NOT go in the qText attribute.  Rather, you set qIsNumeric = True AND send the numeric value in the qNumber attribute. (This is what was my  specific problem that I originally outlined above)