Flexslider 2 how to (re)initiate after page load - flexslider

Question

<div id="div_container_photos" class="cands_container" style="margin-top: 20px;min-height:300px">
<div class="row" id="flexRow" style="margin:0px ;min-height:100%">
<div id="flex_div_select" class="col-sm-4 col-xs-12" style="padding:0px ; padding-right: 15px">
</div>
<div id="flex_div_show" class="col-sm-8 col-xs-12" style="padding:0px; height:100%">
</div>
</div>
</div>
I have 2 flexsliders: the first one selects an album; de second one shows the photos inside that album. My problem is that the flexSlider only shows photos when I initiate it inside $(document).ready(function () {});
I have tried using addSlide but that didn't work either.
So inside $(document).ready I initiate the album Slider:
function maakFlexSliderAlbums()
{
console.log("[FLEXSLIDER]about to create flexslider for selecting albums; number of album inside s_php_arrayNonStripped: " + js_php_arrayNonStripped.length);
return $.Deferred(function () { // <-- see returning Deferred object
var self = this;
var flexSlider;
flexSlider = '<div class="flexslider" style="margin:0px; background-color:#AAA" ><ul class="slides">';
for (var i = 0; i < js_php_arrayNonStripped.length; i++)
{
console.log("[FLEXSLIDER]adding <li> " + js_php_arrayNonStripped[i] + " </li> to mapslider");
flexSlider += '<li><div style="width: 50%; margin: 0 auto;"><h2>' + js_php_arrayNonStripped[i] + '</h2></div></li>';
}
flexSlider += '</ul></div>';
$("#flex_div_select").append(flexSlider);
console.log("[FLEXSLIDER]DOM is build...now initializing");
$('.flexslider').flexslider({
animation: "slide", //String: Select your animation type, "fade" or "slide"
namespace: "flex-", //{NEW} String: Prefix string attached to the class of every element generated by the plugin
selector: ".slides > li", //{NEW} Selector: Must match a simple pattern. '{container} > {slide}' -- Ignore pattern at your own peril
easing: "swing", //{NEW} String: Determines the easing method used in jQuery transitions. jQuery easing plugin is supported!
direction: "horizontal", //String: Select the sliding direction, "horizontal" or "vertical"
reverse: false, //{NEW} Boolean: Reverse the animation direction
animationLoop: true, //Boolean: Should the animation loop? If false, directionNav will received "disable" classes at either end
smoothHeight: false, //{NEW} Boolean: Allow height of the slider to animate smoothly in horizontal mode
startAt: js_php_arrayNonStripped.length - 1, //Integer: The slide that the slider should start on. Array notation (0 = first slide)
slideshow: false, //Boolean: Animate slider automatically
slideshowSpeed: 7000, //Integer: Set the speed of the slideshow cycling, in milliseconds
animationSpeed: 1000, //Integer: Set the speed of animations, in milliseconds
initDelay: 0, //{NEW} Integer: Set an initialization delay, in milliseconds
randomize: false, //Boolean: Randomize slide order
// Usability features
pauseOnAction: true, //Boolean: Pause the slideshow when interacting with control elements, highly recommended.
pauseOnHover: false, //Boolean: Pause the slideshow when hovering over slider, then resume when no longer hovering
useCSS: true, //{NEW} Boolean: Slider will use CSS3 transitions if available
touch: true, //{NEW} Boolean: Allow touch swipe navigation of the slider on touch-enabled devices
video: false, //{NEW} Boolean: If using video in the slider, will prevent CSS3 3D Transforms to avoid graphical glitches
// Primary Controls
controlNav: false, //Boolean: Create navigation for paging control of each clide? Note: Leave true for manualControls usage
directionNav: true, //Boolean: Create navigation for previous/next navigation? (true/false)
prevText: "Previous", //String: Set the text for the "previous" directionNav item
nextText: "Next", //String: Set the text for the "next" directionNav item
// Secondary Navigation
keyboard: true, //Boolean: Allow slider navigating via keyboard left/right keys
multipleKeyboard: false, //{NEW} Boolean: Allow keyboard navigation to affect multiple sliders. Default behavior cuts out keyboard navigation with more than one slider present.
mousewheel: false, //{UPDATED} Boolean: Requires jquery.mousewheel.js (https://github.com/brandonaaron/jquery-mousewheel) - Allows slider navigating via mousewheel
pausePlay: false, //Boolean: Create pause/play dynamic element
pauseText: 'Pause', //String: Set the text for the "pause" pausePlay item
playText: 'Play', //String: Set the text for the "play" pausePlay item
// Special properties
controlsContainer: "", //{UPDATED} Selector: USE CLASS SELECTOR. Declare which container the navigation elements should be appended too. Default container is the FlexSlider element. Example use would be ".flexslider-container". Property is ignored if given element is not found.
manualControls: "", //Selector: Declare custom control navigation. Examples would be ".flex-control-nav li" or "#tabs-nav li img", etc. The number of elements in your controlNav should match the number of slides/tabs.
sync: "", //{NEW} Selector: Mirror the actions performed on this slider with another slider. Use with care.
asNavFor: "", //{NEW} Selector: Internal property exposed for turning the slider into a thumbnail navigation for another slider
// Carousel Options
itemWidth: 0, //{NEW} Integer: Box-model width of individual carousel items, including horizontal borders and padding.
itemMargin: 0, //{NEW} Integer: Margin between carousel items.
minItems: 0, //{NEW} Integer: Minimum number of carousel items that should be visible. Items will resize fluidly when below this.
maxItems: 3, //{NEW} Integer: Maxmimum number of carousel items that should be visible. Items will resize fluidly when above this limit.
move: 0, //{NEW} Integer: Number of carousel items that should move on animation. If 0, slider will move all visible items.
// Callback API
start: function (slider) {
console.log("[FLEXSLIDER]map slider loaded; current slide= " + slider.currentSlide + " ; so that would be " + js_php_arrayNonStripped[slider.currentSlide]);
//when you click an album
$('#flex_div_select .slides li').click(function (event) {
event.preventDefault();
//clicked album -> italic
$('#flex_div_select .slides li h2').css('font-style', 'normal');
$('#flex_div_select .slides .flex-active-slide h2').css('font-style', 'italic');
var album = $('#flex_div_select .slides .flex-active-slide h2').html();
console.log("clicked album slider: " + album);
//get photos from server
// getPhotos(album);
///////////////////////////////////////////////////////////
INITIATE #photoSlider HERE ??
///////////////////////////////////////////////////////////
//slider.flexAnimate(slider.getTarget("next"));
});
//return promise
self.resolve();
}, //Callback: function(slider) - Fires when the slider loads the first slide
before: function () {
}, //Callback: function(slider) - Fires asynchronously with each slider animation
after: function (slider) {
if (slider.currentSlide >= js_php_arrayNonStripped.length)
{
/* newAlbumFolder = $("#txtNewFolder").val();
console.log("[FLEXSLIDER] slided to " + slider.currentSlide + " ; so that would be " + newAlbumFolder);
*/ //console.log("new album detected: " + newAlbumFolder);
}
else
{
newAlbumFolder = js_php_arrayNonStripped[slider.currentSlide];
console.log("[FLEXSLIDER] slided to " + slider.currentSlide + " ; so that would be " + js_php_arrayNonStripped[slider.currentSlide]);
// console.log("excisting album detected: " + newAlbumFolder);
}
// console.log("newAlbumFolder: " + newAlbumFolder);
}, //Callback: function(slider) - Fires after each slider animation completes
end: function () {
}, //Callback: function(slider) - Fires when the slider reaches the last slide (asynchronous)
added: function () {
}, //{NEW} Callback: function(slider) - Fires after a slide is added
removed: function () {
} //{NEW} Callback: function(slider) -*/
});
console.log("[FLEXSLIDER]flexslider initialised");
});
And when I click on the corresponding album I want to initiate #photoSlider.
The only way the #photoSlider gets populated is when I use:
var poging = here comes listsyntax inside quotes;
initFlexSliderVoorPhotos(poging); inside document.ready
the above function does something like:
flexSlider = '<div class="flexslider" style="margin:0px; height:300px; background-color:#AAA" id="photoSlider" > <ul class="slides" style=""> ';
//<div class="flex-viewport" style="overflow: hidden; position: relative;">
flexSlider += slides +'</ul></div>';
$("#flex_div_show").append(flexSlider);
$('#photoSlider').flexslider({....}) (this doesn't get executed!)