[FIX] pasting HTML content into the text box, then trying to navigate/alter it

Navigation implementation can only deal with straight text (and
asserts that), if HTML is pasted in a search input
InputView#getSelection will throw errors and refuse to act.

Clean up input content after a paste event, to ensure only plain text
is present so it can be navigated.

Don't forget to correctly re-set the cursor at the end of the input
data, otherwise the user will face various deep DOM errors when trying
to move around the input with the arrow keys (which he would usually
be able to do after a paste).

lp bug: https://launchpad.net/bugs/1102237 fixed

bzr revid: xmo@openerp.com-20130123091600-nd4rwqpin6qj8ult

addons/web/static/src/js/search.js

@@ -127,7 +127,8 @@ my.InputView = instance.web.Widget.extend({
     events: {
         focus: function () { this.trigger('focused', this); },
         blur: function () { this.$el.text(''); this.trigger('blurred', this); },
-        keydown: 'onKeydown'
+        keydown: 'onKeydown',
+        paste: 'onPaste',
     },
     getSelection: function () {
         // get Text node
@@ -199,6 +200,50 @@ my.InputView = instance.web.Widget.extend({
             }
             break;
         }
+    },
+    setCursorAtEnd: function () {
+        var sel = window.getSelection();
+        sel.removeAllRanges();
+        var range = document.createRange();
+        // in theory, range.selectNodeContents should work here. In practice,
+        // MSIE9 has issues from time to time, instead of selecting the inner
+        // text node it would select the reference node instead (e.g. in demo
+        // data, company news, copy across the "Company News" link + the title,
+        // from about half the link to half the text, paste in search box then
+        // hit the left arrow key, getSelection would blow up).
+        //
+        // Explicitly selecting only the inner text node (only child node at
+        // this point, though maybe we should assert that) avoiids the issue
+        range.selectNode(this.el.childNodes[0]);
+        range.collapse(false);
+        sel.addRange(range);
+    },
+    onPaste: function () {
+        // In MSIE and Webkit, it is possible to get various representations of
+        // the clipboard data at this point e.g.
+        // window.clipboardData.getData('Text') and
+        // event.clipboardData.getData('text/plain') to ensure we have a plain
+        // text representation of the object (and probably ensure the object is
+        // pastable as well, so nobody puts an image in the search view)
+        // (nb: since it's not possible to alter the content of the clipboard
+        // — at least in Webkit — to ensure only textual content is available,
+        // using this would require 1. getting the text data; 2. manually
+        // inserting the text data into the content; and 3. cancelling the
+        // paste event)
+        //
+        // But Firefox doesn't support the clipboard API (as of FF18)
+        // although it correctly triggers the paste event (Opera does not even
+        // do that) => implement lowest-denominator system where onPaste
+        // triggers a followup "cleanup" pass after the data has been pasted
+        setTimeout(function () {
+            // Read text content (ignore pasted HTML)
+            var data = this.$el.text();
+            // paste raw text back in
+            this.$el.empty().text(data);
+            // Set the cursor at the end of the text, so the cursor is not lost
+            // in some kind of error-spawning limbo.
+            this.setCursorAtEnd();
+        }.bind(this), 0);
     }
 });
 my.FacetView = instance.web.Widget.extend({