Changeset - 2ba369aa5c5a
[Not reviewed]
0 2 0
Bradley M. Kuhn - 2 years ago 2020-11-26 17:21:44
Supporter: js: fade out “Expand All” anchor when all sections expand

The expandable sections can be expanded either one-by-one, or with
the “Expand All” button. Add a counter for each expandable
section (which requires their div's to have 'id' attributes, lest
they be counted in the '__global' section of expandables).

The __global counter will work as advertised if you have no 'id'
attributes on any of your 'expandable-section'-classed div's, but if
you mix a __global without an id with ones that *do* have an id, it's
likely this particular code won't work for that.

Finally, add some documentation which is probably over-documenting
for someone who knows Javascript and jQuery well, but it took me a
while to figure out this code so I felt throwing some notes in there
might be helpful.
2 files changed with 27 insertions and 2 deletions:
0 comments (0 inline, 0 general)
Show inline comments
@@ -110,24 +110,49 @@ $(document).ready(function() {
    if (selectSupportTypeFromHash().length === 0) {

    var want_id = window.location.hash.substr(1) || "do not match any id";
    var $expandable_counts = [];
    // First, build a count of expandable div sections
    $('div.expandable-section').each(function(index, section) {
        var $ourid = $(section).attr('id');
        if ($ourid == undefined) { $ourid = "__global"; }
        $expandable_counts[$ourid] = 0;
    $('div[data-read-more]').each(function(index, readmore) {
        var $readmore = $(readmore)
        var $header = $readmore.prev('h3');
        if ($header.length && $header[0].id === want_id) {
            // Do nothing, leave it alone
        } else {
            var $ourid = $readmore.closest(".expandable-section" ).attr('id');
            if ($ourid == undefined) { $ourid = "__global"; }

            // Set up the link for this specific section using the text from
            // the data-read-more atrribute on the div specific to this section
            var $linkpara = $('<p><a class="read-more"></a></p>');
            var $readlink = $linkpara.children('a');
            $readlink.on('click', function(event) {
                // When clicked, we'll restore the actual text and fade it in
                // quickly, and also see if there are any remaining
                // expandable sections left in this particular expandable
                // section.  If none are left, make the "Expand all" button
                // (which lives in an 'a' anchor of the class 'expander') disappear.
                if ($expandable_counts[$ourid] <= 0) {
                  $readmore.closest(".expandable-section" )
                  .children('a.expander').each(function(index, element){
    // Final two each's enable the "Expand All" link.
    $('a[data-expand-link-text]').each(function(index, element) {
        var $element = $(element);
Show inline comments
@@ -77,7 +77,7 @@
<span id="form-correction-needed" class="form-error">Please ensure all form data above is correct.</span>

<hr style="clear: both;"/>
<div class="expandable-section">
<div class="expandable-section" id="2020-summary">

<div class="picture-small right">
  <img src="/img/2020_Sebro-Tony_CopyleftConf.jpg" alt="Tony Sebro speaks on stage in front of a slide comparing 1800&rsquo;s Eschatology and Golden Era Hip Hop">
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