getData(qPages)
Method used to get data from Qlik engine for this object.
- Since:
-
- 1.0
Parameters
| Name | Type | Description |
|---|---|---|
| qPages | Array | An array of NxPage objects. |
Returns
Returns a promise of qDataPages.
Tip noteFor more information regarding a promise, see http://docs.angularjs.org/api/ng.$q.
Examples
Example:
var self = this, requestPage = [{
qTop : i + this.currpos,
qLeft : 0,
qWidth : 10,
qHeight : this.displayrows
}];
this.backendApi.getData(requestPage).then(function(dataPages) {
self.paint($element);
});Example:
In this example, the getData function get the cells defined by requestpage and returns them in the parameter dataPages. It also updates the layout buffer used by eachDataRow, so when the paint function is called again it will have all rows. This way, the visualization is build up gradually.
paint: function ( $element ) {
var lastrow = 0, me = this;
//loop through the rows we have and render
this.backendApi.eachDataRow( function ( rownum, row ) {
lastrow = rownum;
//do something with the row..
});
if(this.backendApi.getRowCount() > lastrow +1){
//we havent got all the rows yet, so get some more, 1000 rows
var requestPage = [{
qTop: lastrow + 1,
qLeft: 0,
qWidth: 10, //should be # of columns
qHeight: Math.min( 1000, this.backendApi.getRowCount() - lastrow )
}];
this.backendApi.getData( requestPage ).then( function ( dataPages ) {
//when we get the result trigger paint again
me.paint( $element );
} );
}
}Learn more
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