fix(scroll): Allow scrolling when touchstart target is an input, #1078

Author: adamdbradley

Diff for: js/ext/angular/test/service/ionicTap.unit.js

@@ -290,4 +290,99 @@ describe('Ionic Tap', function() {
     expect( ionic.tap.ignoreTapInspect(e) ).toEqual(false);
   });
 
+  it('Should not prevent scrolling', function() {
+    var target = document.createElement('div');
+    var e = {
+      target: target
+    };
+    expect( ionic.tap.ignoreScrollStart(e) ).toEqual(false);
+  });
+
+  it('Should prevent scrolling because the event has defaultedPrevented', function() {
+    var target = document.createElement('div');
+    var e = {
+      target: target,
+      defaultPrevented: true
+    };
+    expect( ionic.tap.ignoreScrollStart(e) ).toEqual(true);
+  });
+
+  it('Should not prevent scrolling if the target was an input or textarea', function() {
+    var target = document.createElement('input');
+    var e = {
+      target: target
+    };
+    expect( ionic.tap.ignoreScrollStart(e) ).toEqual(false);
+  });
+
+  it('Should prevent scrolling if the target was an input or textarea, and the target is the same as the active element', function() {
+    var target = document.createElement('input');
+    ionic.tap.activeElement(target);
+    var e = {
+      target: target
+    };
+    expect( ionic.tap.ignoreScrollStart(e) ).toEqual(true);
+  });
+
+  it('Should not prevent scrolling if the target isContentEditable', function() {
+    var target = document.createElement('div');
+    target.isContentEditable = true;
+    var e = {
+      target: target
+    };
+    expect( ionic.tap.ignoreScrollStart(e) ).toEqual(false);
+  });
+
+  it('Should prevent scrolling if the target has dataset.preventScroll', function() {
+    var target = document.createElement('div');
+    target.setAttribute('data-prevent-scroll', 'true');
+    var e = {
+      target: target
+    };
+    expect( ionic.tap.ignoreScrollStart(e) ).toEqual(true);
+
+    target = document.createElement('div');
+    target.dataset.preventScroll = true;
+    e = {
+      target: target
+    };
+    expect( ionic.tap.ignoreScrollStart(e) ).toEqual(true);
+
+    target = document.createElement('div');
+    target.dataset.preventScroll = 'true';
+    e = {
+      target: target
+    };
+    expect( ionic.tap.ignoreScrollStart(e) ).toEqual(true);
+  });
+
+  it('Should prevent scrolling if the browser doesnt support dataset but target has data-prevent-default attribute', function() {
+    var target = {
+      tagName: 'div',
+      getAttribute: function(val) {
+        if(val === 'data-prevent-default') {
+          return 'true';
+        }
+      }
+    }
+    var e = {
+      target: target
+    };
+    expect( ionic.tap.ignoreScrollStart(e) ).toEqual(true);
+  });
+
+  it('Should prevent scrolling if the target is an object or embed', function() {
+    var target = document.createElement('object');
+    var e = {
+      target: target
+    };
+    expect( ionic.tap.ignoreScrollStart(e) ).toEqual(true);
+
+    target = document.createElement('embed');
+    e = {
+      target: target
+    };
+    expect( ionic.tap.ignoreScrollStart(e) ).toEqual(true);
+  });
+
 });

Diff for: js/utils/tap.js

@@ -263,6 +263,14 @@
     reset: function() {
       tapCoordinates = {};
       startCoordinates = {};
+    },
+
+    ignoreScrollStart: function(e) {
+      return (e.defaultPrevented) ||  // defaultPrevented has been assigned by another component handling the event
+             (e.target.tagName.match(/input|textarea/i) && ionic.tap.activeElement() === e.target) || // target is the active element, so its a second tap to select input text
+             (e.target.isContentEditable) ||
+             (e.target.dataset ? e.target.dataset.preventScroll : e.target.getAttribute('data-prevent-default')) == 'true' || // manually set within an elements attributes
+             (!!e.target.tagName.match(/object|embed/i));  // flash/movie/object touches should not try to scroll
     }
 
   };

Diff for: js/views/scrollView.js

@@ -616,16 +616,10 @@ ionic.views.Scroll = ionic.views.View.inherit({
       e.stopPropagation();
     });
 
-    function shouldIgnorePress(e) {
-      return e.target.tagName.match(/input|textarea|select|object|embed/i) ||
-             e.target.isContentEditable ||
-             (e.target.dataset ? e.target.dataset.preventScroll : e.target.getAttribute('data-prevent-default') == 'true');
-    }
-
     if ('ontouchstart' in window) {
 
       container.addEventListener("touchstart", function(e) {
-        if (e.defaultPrevented || shouldIgnorePress(e)) {
+        if ( ionic.tap.ignoreScrollStart(e) ) {
           return;
         }
         self.doTouchStart(e.touches, e.timeStamp);
@@ -648,7 +642,7 @@ ionic.views.Scroll = ionic.views.View.inherit({
       var mousedown = false;
 
       container.addEventListener("mousedown", function(e) {
-        if (e.defaultPrevented || shouldIgnorePress(e)) {
+        if ( ionic.tap.ignoreScrollStart(e) ) {
           return;
         }
         self.doTouchStart([{