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/* This script adds interactivity for wiki-history webpages. |
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* |
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* The main code is within the 'on-click' handler of the "diff" links. |
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* Instead of standard redirection it fills-in two hidden inputs with |
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* the appropriate values and submits the corresponding form. |
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* A special care should be taken if some intermediate edits are hidden. |
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* |
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* For the sake of compatibility with ascetic browsers the code tries |
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* to avoid modern API and ECMAScript constructs. This makes it less |
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* readable and may be reconsidered in the future. |
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*/ |
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window.addEventListener( 'load', function() { |
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var form = document.getElementById("wh-form"); |
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form.method = "GET"; |
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var csrf = form.querySelector("input[name='csrf']"); |
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if( csrf ) form.removeChild( csrf ); |
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var wh_id = document.getElementById("wh-id" ); |
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var wh_pid = document.getElementById("wh-pid"); |
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var wh_cleaner = document.getElementById("wh-cleaner"); |
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var wh_collapser = document.getElementById("wh-collapser"); |
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var wh_radios = []; // user-visible controls for baseline selection |
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var wh_hidden = 0; // current number of hidden (collapsed) rows |
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var wh_selected = -1; // index of the currently selected radio-button |
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var wh_onRadio = function( event ){ |
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var indx = event.target.indx; |
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if( wh_selected == indx ){ |
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wh_selected = -1; |
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event.target.checked = false; |
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} |
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else wh_selected = indx; |
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} |
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var wh_onDifflink = function( event ){ |
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event.preventDefault(); |
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var indx = event.target.indx; |
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wh_id.value = wh_radios[indx].value; |
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if( wh_hidden > 0 ){ |
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var p = indx + 1; |
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if( wh_selected >= 0 ){ |
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var tr = wh_radios[wh_selected].parentElement.parentElement; |
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if( ! tr.hidden ) |
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p = wh_selected; |
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} |
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while( p < wh_radios.length ){ |
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if( ! wh_radios[p].parentElement.parentElement.hidden ) |
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break; |
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p++; |
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} |
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if( p < wh_radios.length ){ |
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wh_pid.value = wh_radios[p].value; |
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wh_pid.checked = true; |
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} |
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else { // just render the wiki for the case of the first major edit |
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var path = document.location.pathname.split("/"); |
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path.pop(); |
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var newpath = path.join("/") + "/info/" + wh_radios[indx].value; |
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document.location = document.location.origin + newpath; |
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return; |
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} |
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} |
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else if( wh_selected >= 0 ) { |
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wh_pid.value = wh_radios[wh_selected].value; |
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wh_pid.checked = true; |
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} |
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else wh_pid.checked = false; |
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document.getElementById("wh-form").submit(); |
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} |
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var wh_onCleaner = function() { |
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if( wh_selected >= 0 ) { |
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wh_radios[wh_selected].checked = false; |
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wh_selected = -1; |
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} |
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} |
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var wh_onCollapser = function( event ){ |
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var collapsing = ( wh_hidden == 0 ); |
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for( var k = 0; k < wh_radios.length; k++ ){ |
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var radio = wh_radios[k]; |
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var tr = radio.parentElement.parentElement; |
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if( tr.className == "wh-intermediate" ){ |
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if( tr.hidden = ! tr.hidden ) |
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wh_hidden++; |
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else |
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wh_hidden--; |
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} else if( radio.iterspan ) |
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radio.iterspan.hidden = ! collapsing; |
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} |
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if( wh_hidden > 0 ) { |
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wh_collapser.title="Show intermediate edits"; |
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wh_collapser.innerHTML = " ♻ " + wh_hidden; |
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} |
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else { |
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wh_collapser.title="Hide intermediate edits"; |
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wh_collapser.innerHTML = " ♲" |
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} |
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} |
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var inputs = document.getElementsByTagName("input"); |
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for( var k = 0, indx = 0; k < inputs.length; k++ ) { |
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var r = inputs[k]; |
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if( r.type == "radio" && r.name == "baseline" ) { |
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wh_radios.push( r ); |
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r.indx = indx++; |
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r.addEventListener( "click", wh_onRadio ); |
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r.disabled = false; |
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var td = r.parentElement.nextElementSibling; |
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r.iterspan = td.getElementsByTagName("span")[0]; |
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} |
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} |
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for( var edits = 0, k = wh_radios.length - 1; k >= 0; k-- ) { |
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var td = wh_radios[k].parentElement.nextElementSibling; |
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if( td.parentElement.className == "wh-intermediate" ) |
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edits++; |
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else if( edits > 0 ){ |
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var span = td.getElementsByTagName("span")[0]; |
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span.innerHTML = " ♲" + edits; |
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wh_radios[k].iterspan = span; |
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edits = 0; |
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// also: ∪ (union) Σ (sigma) × (times) |
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} |
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} |
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var links = document.getElementsByTagName("a"); |
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for( var i = 0, indx = 0; i < links.length; i++ ) { |
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var l = links[i]; |
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if( l.className == "wh-difflink" ){ |
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l.indx = indx++; |
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l.addEventListener( "click", wh_onDifflink ); |
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} |
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} |
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wh_cleaner.addEventListener( "click", wh_onCleaner ); |
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wh_collapser.addEventListener( "click", wh_onCollapser ); |
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wh_collapser.title="Hide intermediate edits"; |
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wh_collapser.hidden = false; |
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}); // window.addEventListener( 'load' ... |
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