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Refactored jump-links into a separate JavaScript file
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,67 @@ | ||
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| // assign IDs to content chunks, and create # links in the margin so that user can obtain a link there | ||
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| // spec: { | ||
| // jumpable: string, jQuery selector of elements that should get jump links | ||
| // exclude: string, jQuery selector of elements to exclude from jumpable | ||
| // nest: { selector:string -> selector:string } | ||
| // } | ||
| function makeJumpLinks(spec) { | ||
| var jumpable = spec.jumpable; | ||
| var exclude = spec.exclude; | ||
| var nest = spec.nest; | ||
| var elements = $(jumpable).not(':has(' + jumpable + ')').not(exclude); | ||
| var chunks = {}; | ||
| var stopwords = [ | ||
| 'a', 'an', 'and', 'are', 'as', 'at', 'by', 'for', 'from', 'has', 'have', 'how', | ||
| 'in', 'is', 'it', 'it-s', 'its', 'let-s', 'of', 'on', 'or', 'that', 'the', 'this', 'to', | ||
| 'was', 'we', 'were', 'we-ll', 'we-re', 'what', 'when', 'where', 'who', 'will', 'with', | ||
| ]; | ||
| elements.map(function(idx, elt) { | ||
| var words = $(this).text().toLowerCase().split(/\s+/).map(function(word) { | ||
| return word.replace(/^\W+|\W+$/g, '').replace(/\W+/g, '-'); | ||
| }).filter(function(word) { | ||
| return word && (stopwords.indexOf(word) < 0); | ||
| }); | ||
| return { $elt: this, $words: words }; | ||
| }).each(function() { | ||
| var here = chunks; | ||
| while (this.$words.length) { | ||
| var word = this.$words.shift(); | ||
| if ( ! here[word]) { | ||
| here[word] = this; | ||
| return; | ||
| } | ||
| if (here[word].$elt) { | ||
| var current = here[word]; | ||
| here[word] = {}; | ||
| if ( ! current.$words.length) { return; } | ||
| here[word][current.$words.shift()] = current; | ||
| } | ||
| here = here[word]; | ||
| } | ||
| }); | ||
| var size = 3; | ||
| (function labeler(labels, tree) { | ||
| if (tree.$elt) { | ||
| if ( ! tree.$elt.id) { | ||
| Array.prototype.push.apply(labels, tree.$words.slice(0, (size - (labels.length % size)) % size)); | ||
| tree.$elt.id = '@' + labels.join('_'); | ||
| } | ||
| } else { | ||
| Object.keys(tree).forEach(function(key) { | ||
| labeler(labels.concat(key), tree[key]); | ||
| }); | ||
| } | ||
| })([], chunks); | ||
| elements.filter('[id]').each(function(idx, elt) { | ||
| var parent = $(elt); | ||
| $.each(nest, function(outer, inner) { | ||
| if (parent.is(outer)) { | ||
| parent = $(inner, parent).not(':empty').first(); | ||
| return false; | ||
| } | ||
| }); | ||
| parent.prepend($('<a>').addClass('jump').attr('href', '#' + elt.id)); | ||
| }); | ||
| } |