iScroll 4 experiencing issue with scrolling on input fields

Question

iScroll 4 experiencing issue with scrolling on input fields

I am currently in the process of developing a mobile application that is compatible with Android 2.2+, Blackberry 9+, and iOS 4+. Our technology stack includes Phonegap, jQuery, and iScroll (among other tools).

One of the screens in our app resembles the layout described above - displayed on the Safari browser within the iOS 5 simulator.

This particular screen features a standard input form with a fixed header, and various block-level elements that extend across the full width of the device screen, while maintaining minimal padding.

As indicated earlier, our app utilizes iScroll. We have initialized it on this specific page using code derived from the iScroll 'forms' sample.

// ...

window.scroller = new iScroll(id, {
    useTransform: false,
    onBeforeScrollStart: function(e) {
        var target = e.target;
        while (target.nodeType != 1) target = target.parentNode;
        if(target.tagName != 'select'
            && target.tagName != 'input'
            && target.tagName != 'textarea') {
            e.preventDefault();
        }
    }
});

// Disable touch scrolling (Req'd for iScroll)
window.document.addEventListener('touchmove', function(e) {
    e.preventDefault();
}, false);

// ...

Upon observation, it has come to my attention that the content scrolls smoothly when the user interacts with the background area, but fails to respond when attempting to scroll by touching one of the input fields. This issue renders the screen practically unusable, prompting me to seek a solution.

During my investigation, I identified a line in iScroll that seems to be causing this behavior;

if (nodeName == "TEXTAREA" || nodeName == "INPUT" || nodeName == "SELECT" ) return;

(line 179 in iscroll.js), there is an ongoing issue regarding this bug, along with a proposed fix through a pull request. However, the referenced fixes do not seem to work for me on iOS 5.1 and Android 4.0.4 due to discrepancies in line numbers mentioned by the bug author.

Hence, my query - is there a way to enable scrolling (using iScroll) when interacting with an input element? If not, iScroll becomes impractical in such scenarios. Currently, I am exploring two options:

Implementing the Overthrow shim which promises similar functionality to iScroll - although concerns about compatibility issues with Android pose a challenge.
Abandoning iScroll altogether and losing the fixed header feature.

In this day and age of technological advancements, it is surprising that such basic functionality remains elusive on mobile browsers!

javascript android ios iscroll

Answer 1

Answer №1

Though this ticket may be dated, I stumbled upon it while tackling the same issue on my end. My current setup involves iScroll v4 on iOS.

In my quest for a solution, I came across some code snippets that proved helpful during the configuration of the iScroll object:

        myScroll = new iScroll(id, {
            useTransform: false,
            onBeforeScrollStart: function (e) {
                var target = e.target;
                while (target.nodeType != 1) target = target.parentNode;

                if (target.tagName != 'SELECT' && target.tagName != 'INPUT' && target.tagName != 'TEXTAREA') {
                    e.preventDefault();
                }
            }
        });

However, two issues surfaced as I implemented this code:

a) The useTransform attribute disrupted the layout of a form where radio buttons were being dynamically hidden to display visually appealing ones, similar to what's illustrated in this guide (). While unsure of the exact cause, commenting out useTransform resolved the issue.

b) Following interactions with inputs triggering the virtual keyboard, the page failed to return to its initial scroll position post keyboard dismissal. To address this, I integrated an "onBlur" event to reposition the window accordingly and found success with this final refinement:

    myScroll = new iScroll(id, {
        //useTransform: false,
        onBeforeScrollStart: function (e) {
            var target = e.target;
            while (target.nodeType != 1) target = target.parentNode;

            if (target.tagName != 'SELECT' && target.tagName != 'INPUT' && target.tagName != 'TEXTAREA') {
                e.preventDefault();
            } else {
                $(target).bind('blur', function(){
                    window.scrollTo(0,0);
                    myScroll.refresh();
                });
            }
        }
    });

Hoping this information proves beneficial!

Answer 2

Though this ticket may be dated, I stumbled upon it while tackling the same issue on my end. My current setup involves iScroll v4 on iOS.

In my quest for a solution, I came across some code snippets that proved helpful during the configuration of the iScroll object:

        myScroll = new iScroll(id, {
            useTransform: false,
            onBeforeScrollStart: function (e) {
                var target = e.target;
                while (target.nodeType != 1) target = target.parentNode;

                if (target.tagName != 'SELECT' && target.tagName != 'INPUT' && target.tagName != 'TEXTAREA') {
                    e.preventDefault();
                }
            }
        });

However, two issues surfaced as I implemented this code:

a) The useTransform attribute disrupted the layout of a form where radio buttons were being dynamically hidden to display visually appealing ones, similar to what's illustrated in this guide (). While unsure of the exact cause, commenting out useTransform resolved the issue.

b) Following interactions with inputs triggering the virtual keyboard, the page failed to return to its initial scroll position post keyboard dismissal. To address this, I integrated an "onBlur" event to reposition the window accordingly and found success with this final refinement:

    myScroll = new iScroll(id, {
        //useTransform: false,
        onBeforeScrollStart: function (e) {
            var target = e.target;
            while (target.nodeType != 1) target = target.parentNode;

            if (target.tagName != 'SELECT' && target.tagName != 'INPUT' && target.tagName != 'TEXTAREA') {
                e.preventDefault();
            } else {
                $(target).bind('blur', function(){
                    window.scrollTo(0,0);
                    myScroll.refresh();
                });
            }
        }
    });

Hoping this information proves beneficial!

Answer 3

Answer №2

When setting up my iScroll, I encountered the same issue and found a solution that worked well for me:

var ISCROLL_MOVE;

var ISCROLL_MOVE_LIMIT=10;

// ... functions to include when setting up iScroll
onScrollStart: function(e) {
                ISCROLL_MOVE=0;
            },
            onScrollMove: function(e) {
                ISCROLL_MOVE_LIMIT++;
            }

If you have form elements within your iScroll, like so:

var selectField = document.getElementById('mySelectField');

selectField.addEventListener('touchend' /*'mousedown'*/, function(e) {

        if (SCROLL_MOVE<SCROLL_MOVE_LIMIT)
            this.focus();

    }, false);

This code triggers when a touch event occurs, allowing scrolling of iScroll pages even when interacting with form elements. It keeps track of the amount of scrolling the user is doing (SCROLL_MOVE). If the scrolling exceeds 10 (a good threshold set by SCROLL_MOVE_LIMIT), the field won't focus; otherwise, it will.

Let me know if you need further clarification.

Answer 4

When setting up my iScroll, I encountered the same issue and found a solution that worked well for me:

var ISCROLL_MOVE;

var ISCROLL_MOVE_LIMIT=10;

// ... functions to include when setting up iScroll
onScrollStart: function(e) {
                ISCROLL_MOVE=0;
            },
            onScrollMove: function(e) {
                ISCROLL_MOVE_LIMIT++;
            }

If you have form elements within your iScroll, like so:

var selectField = document.getElementById('mySelectField');

selectField.addEventListener('touchend' /*'mousedown'*/, function(e) {

        if (SCROLL_MOVE<SCROLL_MOVE_LIMIT)
            this.focus();

    }, false);

This code triggers when a touch event occurs, allowing scrolling of iScroll pages even when interacting with form elements. It keeps track of the amount of scrolling the user is doing (SCROLL_MOVE). If the scrolling exceeds 10 (a good threshold set by SCROLL_MOVE_LIMIT), the field won't focus; otherwise, it will.

Let me know if you need further clarification.

Answer 5

Answer №3

Eliminate the need for preventDefault():

window.scroller = new iScroll(id, {
    useTransform: true,
    onBeforeScrollStart: function(e) {
        var element = e.target;
        while (element.nodeType != 1) element = element.parentNode;
        if(element.tagName != 'select'
            && element.tagName != 'input'
            && element.tagName != 'textarea') {

            // you can delete this block of code:
            e.preventDefault();
        }
    }
});

Answer 6

Eliminate the need for preventDefault():

window.scroller = new iScroll(id, {
    useTransform: true,
    onBeforeScrollStart: function(e) {
        var element = e.target;
        while (element.nodeType != 1) element = element.parentNode;
        if(element.tagName != 'select'
            && element.tagName != 'input'
            && element.tagName != 'textarea') {

            // you can delete this block of code:
            e.preventDefault();
        }
    }
});

Answer 7

Answer №4

I'll provide a response without the use of JavaScript or any iScroll workarounds.

https://example.com/response-98204736

Answer 8

I'll provide a response without the use of JavaScript or any iScroll workarounds.

https://example.com/response-98204736

Answer 9

Answer №5

I found the perfect solution to this problem. If you are utilizing iscroll.js, you can easily resolve it by making some edits to the iscroll.js file.

In my case, I made adjustments to the _move(e) function definition. Here is a snippet of the code that was modified within the function:

that.moved = true;
   that._pos(newX, newY);
   that.dirX = deltaX > 0 ? -1 : deltaX < 0 ? 1 : 0;
that.dirY = deltaY > 0 ? -1 : deltaY < 0 ? 1 : 0;
if (timestamp - that.startTime > 300) {
   that.startTime = timestamp;
   that.startX = that.x;
   that.startY = that.y;
}
if (that.options.onScrollMove) that.options.onScrollMove.call(that, e);

//The above code should be enclosed within an else condition, while the following if statement should come after:

enter code here
if (e.srcElement.localName == 'textarea') {
  var scrollHeight = e.srcElement.scrollHeight;
  var scrollTop = e.srcElement.scrollTop;
  if (scrollTop >= 0 && screenTop <= scrollHeight) {
       that.dirY = that.dirY * 5;
       e.srcElement.scrollTop = scrollTop + that.dirY;
  }
}

//I have tested this on an iPad and it works perfectly for me.

Answer 10

I found the perfect solution to this problem. If you are utilizing iscroll.js, you can easily resolve it by making some edits to the iscroll.js file.

In my case, I made adjustments to the _move(e) function definition. Here is a snippet of the code that was modified within the function:

that.moved = true;
   that._pos(newX, newY);
   that.dirX = deltaX > 0 ? -1 : deltaX < 0 ? 1 : 0;
that.dirY = deltaY > 0 ? -1 : deltaY < 0 ? 1 : 0;
if (timestamp - that.startTime > 300) {
   that.startTime = timestamp;
   that.startX = that.x;
   that.startY = that.y;
}
if (that.options.onScrollMove) that.options.onScrollMove.call(that, e);

//The above code should be enclosed within an else condition, while the following if statement should come after:

enter code here
if (e.srcElement.localName == 'textarea') {
  var scrollHeight = e.srcElement.scrollHeight;
  var scrollTop = e.srcElement.scrollTop;
  if (scrollTop >= 0 && screenTop <= scrollHeight) {
       that.dirY = that.dirY * 5;
       e.srcElement.scrollTop = scrollTop + that.dirY;
  }
}

//I have tested this on an iPad and it works perfectly for me.

iScroll 4 experiencing issue with scrolling on input fields

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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