Make range widget update according to given field

[David Allen]

Right now I have a range widget that controls a scroll_index field.  It increments by 1.  I also have two buttons that increment and decrement the same scroll_index by 5.  Problem is, when I use the buttons, the range widget does not update to reflect the modified scroll_index value, and I'd like it to do so.  Is there a way to force the range widget to reflect the scroll_index value?

[David Allen]

So I came up with an inelegant solution that solves the problem.

To clarify the situation I had, I had a list of tiddlers that would only show five at a time, and would scroll using a range widget and a left/right button combination.  The range widget scrolls by 1, the left/right buttons scroll by five.  The issue I had was the list and buttons were working correctly, but the range widget was not updating according to the input of the buttons.

The first solution I had was to move the field being modified to another tiddler, which I called Scratch_Pad.  This did not work, but it was convenient for me for later on.

Second solution I had was to change the default value of the range widget to equal Scratch_Pad!!scroll_index, which is the same value the widget and the buttons modified.  It worked, but the slider was very difficult to use as it would de-select itself every time I moved the slider, requiring me to re-click the slider and move it one-by-one every time I wanted to change the value.

The solution that finally worked is a bit wonky.  I read in another thread that modifying a draft of a tiddler works smoothly for the range widget.  The problem I had was having the default value of the range widget be the same field as the value the range widget was trying to modify.  Here's what I did instead:

Set the tiddler the range widget modifies to be Draft of 'Scratch_Pad', keeping the field as scroll_index

Set the default it pulls from to be Scratch_Pad!!scroll_index, NOT the draft

Set the value the buttons base their calculations on to Draft of 'Scratch_Pad'!!scroll_index.  This makes sure the buttons will move the value last updated by the range widget.

When the buttons calculate the new values, make sure they update the scroll_index fields in both the Scratch_Pad AND Draft of 'Scratch_Pad' tiddlers to update the range widget's position and make sure the value it next calculates is accurate

Base the horizontal list's position on the Draft of 'Scratch_Pad' value.

[Jeremy Ruston]

Hi David

Please could you post the code you referred to in your original post? I have a feeling that the draft thing might be a red herring, and that this may be about avoiding refresh cycles that destroy and recreate the range widget while it is being used (which is a version of a classic TW5 gotcha: that one cannot use an edit widget to edit a field of the tiddler in which the edit widget appears).

Best wishes

Jeremy

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[David Allen]

Sorry it's taken me a while to respond. I've posted an unrelated question regarding the same code here: https://groups.google.com/forum/?hl=en&fromgroups#!topic/tiddlywiki/RSecD3M6Vio, so the code that solved this should be visible there.

Jeremy

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[Eric Shulman]

On Thursday, October 10, 2019 at 5:10:40 PM UTC-7, David Allen wrote:

Right now I have a range widget that controls a scroll_index field.  It increments by 1.  I also have two buttons that increment and decrement the same scroll_index by 5.  Problem is, when I use the buttons, the range widget does not update to reflect the modified scroll_index value, and I'd like it to do so.  Is there a way to force the range widget to reflect the scroll_index value?

I ran into the same issue with using a button to modify the underlying tiddler value shown in a range widget, and reported it directly to Jeremy during a one-to-one Skype chat.

It turns out that there was a bug in the $range widget refresh handler, which Jeremy has fixed in TW5.1.22 (pre-release).

See https://github.com/Jermolene/TiddlyWiki5/commit/e84c422e5091c02f55db4027faa9ba840e2aee6c for the code changes

enjoy,

-e