calling a controller function - angularjs - html

Question

Want to call a controller function from a directive tag.
Demo : https://jsfiddle.net/6qqfv61k/
when clicked on 'Export to Excel' i want to call dataToExport() from appCtrl as data is available to export.Any inputs?
html:
<div ng-controller="appCtrl">
</div>
<div excel-export export-data="exportData" file-name="{{fileName}}"></div>
js code:
var app = angular.module('myApp', []);
app.controller('appCtrl', ['$scope', function($scope) {
$scope.dataToExport = function(){
$scope.jsonToExport = [
{
"col1data": "1",
"col2data": "Fight Club",
"col3data": "Brad Pitt"
},
{
"col1data": "2",
"col2data": "Matrix (Series)",
"col3data": "Keanu Reeves"
},
{
"col1data": "3",
"col2data": "V for Vendetta",
"col3data": "Hugo Weaving"
}
];
// Prepare Excel data:
$scope.fileName = "report";
$scope.exportData = [];
// Headers:
$scope.exportData.push(["#", "Movie", "Actor"]);
// Data:
angular.forEach($scope.jsonToExport, function(value, key) {
$scope.exportData.push([value.col1data, value.col2data, value.col3data]);
});
}
}]);
//directive

Answer 1

Use & in the scope option of the directive. & bindings are ideal for binding callback functions to directive. Pass function to the directive as callback
Move the directive inside controller scope
<div ng-controller="appCtrl">
<div excel-export export-data="exportData" file-name="{{fileName}}" call-back="dataToExport()"></div>
</div>
Directive
.directive('excelExport',
function () {
return {
restrict: 'A',
scope: {
fileName: "#",
data: "&exportData",
callBack: "&"
},..
invoke callBack() in the click method of the directive
scope.download = function() {
scope.callBack();
....
}

Answer 2

you can define dataToExport into directives scope function. please take a look
<div ng-controller="appCtrl">
<div excel-export export-data="exportData" export="dataToExport()" file-name="{{fileName}}"></div>
</div>
app
.directive('excelExport',
function () {
return {
restrict: 'A',
scope: {
fileName: "#",
data: "&exportData",
dataToExport: '&export'
},
replace: true,
template: '<button class="btn btn-primary btn-ef btn-ef-3 btn-ef-3c mb-10" ng-click="download()">Export to Excel <i class="fa fa-download"></i></button>',
link: function (scope, element) {
scope.download = function() {
scope.dataToExport();
function datenum(v, date1904) {
if(date1904) v+=1462;
var epoch = Date.parse(v);
return (epoch - new Date(Date.UTC(1899, 11, 30))) / (24 * 60 * 60 * 1000);
};
function getSheet(data, opts) {
var ws = {};
var range = {s: {c:10000000, r:10000000}, e: {c:0, r:0 }};
for(var R = 0; R != data.length; ++R) {
for(var C = 0; C != data[R].length; ++C) {
if(range.s.r > R) range.s.r = R;
if(range.s.c > C) range.s.c = C;
if(range.e.r < R) range.e.r = R;
if(range.e.c < C) range.e.c = C;
var cell = {v: data[R][C] };
if(cell.v == null) continue;
var cell_ref = XLSX.utils.encode_cell({c:C,r:R});
if(typeof cell.v === 'number') cell.t = 'n';
else if(typeof cell.v === 'boolean') cell.t = 'b';
else if(cell.v instanceof Date) {
cell.t = 'n'; cell.z = XLSX.SSF._table[14];
cell.v = datenum(cell.v);
}
else cell.t = 's';
ws[cell_ref] = cell;
}
}
if(range.s.c < 10000000) ws['!ref'] = XLSX.utils.encode_range(range);
return ws;
};
function Workbook() {
if(!(this instanceof Workbook)) return new Workbook();
this.SheetNames = [];
this.Sheets = {};
}
var wb = new Workbook(), ws = getSheet(scope.data());
/* add worksheet to workbook */
wb.SheetNames.push(scope.fileName);
wb.Sheets[scope.fileName] = ws;
var wbout = XLSX.write(wb, {bookType:'xlsx', bookSST:true, type: 'binary'});
function s2ab(s) {
var buf = new ArrayBuffer(s.length);
var view = new Uint8Array(buf);
for (var i=0; i!=s.length; ++i) view[i] = s.charCodeAt(i) & 0xFF;
return buf;
}
saveAs(new Blob([s2ab(wbout)],{type:"application/octet-stream"}), scope.fileName+'.xlsx');
};
}
};
}
);