[gimp-web/testing] Added img-swap.js for any page to reference

[Pat David <patdavid src gnome org>]

commit ca431f61fb969248a6b341d60c5a57d7db7446e8
Author: Pat David <patdavid gmail com>
Date:   Mon May 2 15:54:55 2016 -0500

    Added img-swap.js for any page to reference

 content/js/img-swap.js |   44 ++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 44 insertions(+), 0 deletions(-)
---
diff --git a/content/js/img-swap.js b/content/js/img-swap.js
new file mode 100644
index 0000000..923b7ef
--- /dev/null
+++ b/content/js/img-swap.js
@@ -0,0 +1,44 @@
+/*
+ * Simple image swapping using html5 data-* attributes.
+ * Get all images with the 'data-swap-src' attribute.
+ * For each image, set the 'data-swap' attribute to a start value
+ * Add event listener to the images to trigger swap function
+ * swap function swaps out the current src and data-swap values
+ */
+var imgs = document.querySelectorAll('[data-swap-src]');
+
+var images_pre = new Array();
+
+for ( var i = 0; i < imgs.length; i++ ){
+       imgs[i].setAttribute('data-swap', imgs[i].getAttribute('data-swap-src') );
+       imgs[i].addEventListener('click', swap, false);
+       imgs[i].style.cursor = "crosshair";
+    images_pre[i] = new Image();
+    images_pre[i].src = imgs[i].getAttribute('data-swap-src');
+}
+
+function swap(evt){
+       var et = evt.target;
+       var tmp = et.src;
+       et.src = et.getAttribute('data-swap');
+       et.setAttribute('data-swap', tmp);
+       et.style.cursor == "crosshair" ? et.style.cursor = "w-resize" : et.style.cursor = "crosshair";
+}
+
+var figswap = document.querySelectorAll('[data-fig-swap]');
+
+    //et.parentNode.parentNode.getElementsByTagName('img')[0].src = et.getAttribute('data-fig-swap');
+
+function swapfig(evt){
+    var et = evt.target;
+    et.parentNode.parentNode.getElementsByTagName('img')[0].src = et.getAttribute('data-fig-swap');
+}
+
+var images_pre = new Array();
+
+for ( var i = 0; i< figswap.length; i++ ){
+    images_pre[i] = new Image();
+    images_pre[i].src = figswap[i].getAttribute('data-fig-swap');
+    figswap[i].addEventListener('click', swapfig, false);
+}
+