Refactor SelectionTable to use per-table initializers for row selection controls and improve JavaScript handling in templates
This commit is contained in:
Ross
+85
-78
@@ -18,8 +18,6 @@ from django.contrib.auth.models import User
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# column (input name="selection") and table attrs that client-side
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# scripts can use to find selectable tables.
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class SelectionTable(tables.Table):
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# Provide a default selection checkbox column. Subclasses that wish to
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# customise can override this attribute.
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selection = tables.CheckBoxColumn(
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accessor="pk",
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orderable=False,
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@@ -32,16 +30,9 @@ class SelectionTable(tables.Table):
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)
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class Meta:
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# Defaults: add js-row-selectable class so client-side code can
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# locate tables that support row selection.
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attrs = {"class": "table js-row-selectable", "data-selection-name": "selection"}
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def __init__(self, *args, **kwargs):
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# Ensure selection column is always placed last in the column order
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# so that table actions/controls appear to the right. We attempt to
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# reorder columns after initialization; if django-tables2 provides
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# `reorder_columns`, use it, otherwise fall back to setting
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# `self.sequence`.
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super().__init__(*args, **kwargs)
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try:
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cols = list(self.columns.names())
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@@ -49,19 +40,12 @@ class SelectionTable(tables.Table):
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cols.remove('selection')
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cols.append('selection')
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try:
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# Preferred API when available
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self.reorder_columns(cols)
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except Exception:
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# Fallback: set sequence attribute
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self.sequence = tuple(cols)
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except Exception:
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# Defensive: don't break table rendering if introspection fails
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pass
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# Expose a per-instance selection token and ensure the table has the
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# `js-row-selectable` class so client-side scripts (or the inline
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# initializer below) can find the correct table without extra markup
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# in templates.
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try:
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token = format(id(self), 'x')
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attrs = getattr(self, 'attrs', None) or {}
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@@ -71,77 +55,100 @@ class SelectionTable(tables.Table):
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attrs['data-selection-token'] = token
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self.attrs = attrs
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except Exception:
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# non-fatal
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pass
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# By default render the row selection controls above the table so
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# templates don't need to include `{{ table.row_selection_controls }}`.
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try:
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# `row_selection_controls` is already marked safe HTML.
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self.caption = self.row_selection_controls
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except Exception:
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pass
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self.caption = self.row_selection_controls
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@property
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def row_selection_controls(self):
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"""Return HTML for the row-selection control bar.
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token = (self.attrs or {}).get('data-selection-token', format(id(self), 'x'))
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Usage: render in template with `{{ table.row_selection_controls|safe }}`
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html = (
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f"<div class=\"d-flex justify-content-between align-items-center mb-2\">"
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f" <div>"
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f" <button class=\"btn btn-outline-secondary btn-sm\" id=\"toggle-row-selection-{token}\" type=\"button\">Enable row selection</button>"
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f" <div id=\"selection-controls-{token}\" class=\"btn-group ms-2\" role=\"group\" style=\"display:none;\">"
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f" <button type=\"button\" class=\"btn btn-sm btn-outline-primary\" id=\"select-all-{token}\">Select all</button>"
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f" <button type=\"button\" class=\"btn btn-sm btn-outline-secondary\" id=\"clear-selection-{token}\">Clear</button>"
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f" </div>"
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f" </div>"
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f" <div>"
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f" <small class=\"text-muted\">Selected: <span id=\"selected-count-{token}\">0</span></small>"
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f" </div>"
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f"</div>"
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)
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The control IDs are suffixed with a small per-instance token to
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avoid collisions when multiple tables are present on the same page.
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"""
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token = (self.attrs or {}).get('data-selection-token', format(id(self), 'x'))
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script = """
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<script>
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(function(){
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var token = '__TOKEN__';
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window.__selection_inits = window.__selection_inits || {};
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window.__selection_inits[token] = function(){
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try { console.log && console.log('selection init registered', token); } catch (e) {}
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var toggleBtn = document.getElementById('toggle-row-selection-' + token);
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try { console.log && console.log('selection init running', token, 'table?', !!table); } catch (e) {}
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if (!toggleBtn) return;
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var controlsEl = document.getElementById('selection-controls-' + token);
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var selectAllBtn = document.getElementById('select-all-' + token);
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var clearBtn = document.getElementById('clear-selection-' + token);
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var selectedCountSpan = document.getElementById('selected-count-' + token);
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var table = document.querySelector('table.js-row-selectable[data-selection-token="' + token + '"]');
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if (!table) return;
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html = (
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"<div class=\"d-flex justify-content-between align-items-center mb-2\">"
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" <div>"
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" <button class=\"btn btn-outline-secondary btn-sm\" id=\"toggle-row-selection-{}\" type=\"button\">Enable row selection</button>"
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" <div id=\"selection-controls-{}\" class=\"btn-group ms-2\" role=\"group\" style=\"display:none;\">"
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" <button type=\"button\" class=\"btn btn-sm btn-outline-primary\" id=\"select-all-{}\">Select all</button>"
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" <button type=\"button\" class=\"btn btn-sm btn-outline-secondary\" id=\"clear-selection-{}\">Clear</button>"
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" </div>"
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" </div>"
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" <div>"
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" <small class=\"text-muted\">Selected: <span id=\"selected-count-{}\">0</span></small>"
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" </div>"
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"</div>"
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).format(token, token, token, token, token)
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# Append a small inline initializer that wires the controls to the
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# specific table instance. This moves the behaviour into the server
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# side table class so pages don't need global wiring.
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script = (
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"<script>(function(){"
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"var token='{t}';"
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"var toggleBtn=document.getElementById('toggle-row-selection-'+token);"
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"if(!toggleBtn) return;"
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"var controlsEl=document.getElementById('selection-controls-'+token);"
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"var selectAllBtn=document.getElementById('select-all-'+token);"
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"var clearBtn=document.getElementById('clear-selection-'+token);"
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"var selectedCountSpan=document.getElementById('selected-count-'+token);"
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"var table=document.querySelector('table.js-row-selectable[data-selection-token=\"'+token+'\"]');"
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"if(!table) return;"
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"var selectionEnabled=false;"
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"function findRowCheckboxes(){"
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" var checks=Array.from(table.querySelectorAll('input[type=\"checkbox\"][name=\"selection\"]'));"
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" if(!checks.length) checks=Array.from(table.querySelectorAll('input[type=\"checkbox\"]'));"
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" return checks;"
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"}"
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"function updateSelectedCount(){ if(!selectedCountSpan) return; var checks=findRowCheckboxes(); var count=checks.filter(function(c){return c.checked;}).length; selectedCountSpan.textContent=count; checks.forEach(function(cb){var tr=cb.closest('tr'); if(tr) tr.classList.toggle('table-active', cb.checked);}); }"
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"function setCheckboxesDisabled(disabled){ findRowCheckboxes().forEach(function(cb){ cb.disabled=disabled; }); }"
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"function hideSelectionColumn(){ table.querySelectorAll('th, td').forEach(function(cell){ if(cell.querySelector && cell.querySelector('input[type=\"checkbox\"][name=\"selection\"]')) cell.style.display='none'; }); }"
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"function showSelectionColumn(){ table.querySelectorAll('th, td').forEach(function(cell){ if(cell.querySelector && cell.querySelector('input[type=\"checkbox\"][name=\"selection\"]')) cell.style.display=''; }); }"
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"setCheckboxesDisabled(true); hideSelectionColumn();"
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"table.addEventListener('click', function(e){ if(!selectionEnabled) return; var tag=(e.target.tagName||'').toLowerCase(); if(['input','a','button','select','textarea','label'].indexOf(tag)!==-1) return; var tr=e.target.closest('tr'); if(!tr||!table.contains(tr)) return; var cb=tr.querySelector('input[type=\"checkbox\"][name=\"selection\"]')||tr.querySelector('input[type=\"checkbox\"]'); if(cb && !cb.disabled){ cb.checked=!cb.checked; tr.classList.toggle('table-active', cb.checked); updateSelectedCount(); } }, true);"
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"table.addEventListener('change', function(e){ if(e.target && e.target.matches && e.target.matches('input[type=\"checkbox\"]')) updateSelectedCount(); }, true);"
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"toggleBtn.addEventListener('click', function(){ selectionEnabled=!selectionEnabled; if(selectionEnabled){ toggleBtn.textContent='Disable row selection'; if(controlsEl) controlsEl.style.display=''; setCheckboxesDisabled(false); showSelectionColumn(); } else { toggleBtn.textContent='Enable row selection'; if(controlsEl) controlsEl.style.display='none'; setCheckboxesDisabled(true); hideSelectionColumn(); findRowCheckboxes().forEach(function(cb){ cb.checked=false; }); updateSelectedCount(); } });"
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"if(selectAllBtn) selectAllBtn.addEventListener('click', function(){ findRowCheckboxes().forEach(function(cb){ if(!cb.disabled) cb.checked=true; }); updateSelectedCount(); });"
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"if(clearBtn) clearBtn.addEventListener('click', function(){ findRowCheckboxes().forEach(function(cb){ if(!cb.disabled) cb.checked=false; }); updateSelectedCount(); });"
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"updateSelectedCount();"
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"})();</script>"
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).format(t=token)
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var selectionEnabled = false;
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var lastChecked = null;
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return mark_safe(html + script)
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function findRowCheckboxes() { var checks = Array.from(table.querySelectorAll('input[type="checkbox"][name="selection"]')); if (!checks.length) checks = Array.from(table.querySelectorAll('input[type="checkbox"]')); return checks; }
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function updateSelectedCount() { if (!selectedCountSpan) return; var checks = findRowCheckboxes(); var count = checks.filter(function(c){ return c.checked; }).length; selectedCountSpan.textContent = count; checks.forEach(function(cb){ var tr = cb.closest('tr'); if (tr) tr.classList.toggle('table-active', cb.checked); }); }
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function setCheckboxesDisabled(disabled) { findRowCheckboxes().forEach(function(cb){ cb.disabled = disabled; }); lastChecked = null; }
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function hideSelectionColumn() { table.querySelectorAll('th, td').forEach(function(cell){ if (cell.querySelector && cell.querySelector('input[type="checkbox"][name="selection"]')) cell.style.display = 'none'; }); }
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function showSelectionColumn() { table.querySelectorAll('th, td').forEach(function(cell){ if (cell.querySelector && cell.querySelector('input[type="checkbox"][name="selection"]')) cell.style.display = ''; }); }
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setCheckboxesDisabled(true); hideSelectionColumn();
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table.addEventListener('click', function(e){
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if (!selectionEnabled) return;
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var tag = (e.target.tagName || '').toLowerCase();
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if (['a','button','select','textarea','label'].indexOf(tag) !== -1) return;
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if (e.target && e.target.matches && e.target.matches('input[type="checkbox"]')){
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var cb = e.target;
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if (e.shiftKey && lastChecked && lastChecked !== cb){
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var checks = findRowCheckboxes();
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var start = checks.indexOf(lastChecked);
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var end = checks.indexOf(cb);
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if (start > -1 && end > -1){
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if (start > end){ var tmp = start; start = end; end = tmp; }
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for (var i = start; i <= end; i++){ if (!checks[i].disabled) checks[i].checked = cb.checked; }
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updateSelectedCount();
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}
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}
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lastChecked = cb;
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return;
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}
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var tr = e.target.closest('tr'); if (!tr || !table.contains(tr)) return;
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var cb = tr.querySelector('input[type="checkbox"][name="selection"]') || tr.querySelector('input[type="checkbox"]');
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if (cb && !cb.disabled){ cb.checked = !cb.checked; tr.classList.toggle('table-active', cb.checked); updateSelectedCount(); lastChecked = cb; }
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}, true);
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table.addEventListener('change', function(e){ if (e.target && e.target.matches && e.target.matches('input[type="checkbox"]')) updateSelectedCount(); }, true);
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toggleBtn.addEventListener('click', function(){ selectionEnabled = !selectionEnabled; if (selectionEnabled){ toggleBtn.textContent = 'Disable row selection'; if (controlsEl) controlsEl.style.display = ''; setCheckboxesDisabled(false); showSelectionColumn(); } else { toggleBtn.textContent = 'Enable row selection'; if (controlsEl) controlsEl.style.display = 'none'; setCheckboxesDisabled(true); hideSelectionColumn(); findRowCheckboxes().forEach(function(cb){ cb.checked = false; }); updateSelectedCount(); lastChecked = null; } });
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if (selectAllBtn) selectAllBtn.addEventListener('click', function(){ findRowCheckboxes().forEach(function(cb){ if (!cb.disabled) cb.checked = true; }); updateSelectedCount(); lastChecked = null; });
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if (clearBtn) clearBtn.addEventListener('click', function(){ findRowCheckboxes().forEach(function(cb){ if (!cb.disabled) cb.checked = false; }); updateSelectedCount(); lastChecked = null; });
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updateSelectedCount();
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};
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})();
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</script>
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"""
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# Replace the simple placeholder with the runtime token. Using
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# a plain triple-quoted string avoids f-string brace parsing errors
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# from the JavaScript code which contains many `{`/`}` characters.
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script = script.replace('__TOKEN__', token)
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return mark_safe(html + script)
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class SingleImageColumn(tables.Column):
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def render(self, value):
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