silverstripe-framework/javascript/AssetUploadField.js

(function($) {
	$('.ss-assetuploadfield').entwine({
		onmatch: function() {
			this._super();
			
			// Hide the "second step" part until we're actually uploading
			this.find('.ss-uploadfield-editandorganize').hide();
		},
		onunmatch: function() {
			this._super();
		},
		onfileuploadadd: function(e) {
			this.find('.ss-uploadfield-editandorganize').show();
		},
		onfileuploadstart: function(e) {
			this.find('.ss-uploadfield-editandorganize').show();
		}
	});

	$('.ss-uploadfield-view-allowed-extensions .toggle').entwine({
		onclick: function(e) {
			var allowedExt = this.closest('.ss-uploadfield-view-allowed-extensions'),
				minHeightVal = this.closest('.ui-tabs-panel').height() + 20;
			
			allowedExt.toggleClass('active');
			allowedExt.find('.toggle-content').css('minHeight', minHeightVal);
		}
	});
}(jQuery));