Refactor searchable widget

Change-Id: I0d342a3f31769fe71059d08653002454851b61cc
Signed-off-by: Sawyer Bergeron <sawyerbergeron@gmail.com>

1 files changed, 302 insertions, 0 deletions

diff --git a/src/static/js/dashboard.js b/src/static/js/dashboard.js
index e51a219..0ed61e8 100644
--- a/src/static/js/dashboard.js
+++ b/src/static/js/dashboard.js
@@ -830,3 +830,305 @@ class NetworkStep {
         req.send(formData);
     }
 }
+
+class SearchableSelectMultipleWidget {
+    constructor(format_vars, field_dataset, field_initial) {
+        this.format_vars = format_vars;
+        this.items = field_dataset;
+        this.initial = field_initial;
+
+        this.expanded_name_trie = {"isComplete": false};
+        this.small_name_trie = {"isComplete": false};
+        this.string_trie = {"isComplete": false};
+
+        this.added_items = new Set();
+
+        for( let e of ["show_from_noentry", "show_x_results", "results_scrollable", "selectable_limit", "placeholder"] )
+        {
+            this[e] = format_vars[e];
+        }
+
+        this.search_field_init();
+
+        if( this.show_from_noentry )
+        {
+            this.search("");
+        }
+    }
+
+    disable() {
+        const textfield = document.getElementById("user_field");
+        const drop = document.getElementById("drop_results");
+
+        textfield.disabled = "True";
+        drop.style.display = "none";
+
+        const btns = document.getElementsByClassName("btn-remove");
+        for( const btn of btns )
+        {
+            btn.classList.add("disabled");
+            btn.onclick = "";
+        }
+    }
+
+    search_field_init() {
+        this.build_all_tries(this.items);
+
+        for( const elem of this.initial )
+        {
+            this.select_item(elem);
+        }
+        if(this.initial.length == 1)
+        {
+            this.search(this.items[this.initial[0]]["small_name"]);
+            document.getElementById("user_field").value = this.items[this.initial[0]]["small_name"];
+        }
+    }
+
+    build_all_tries(dict)
+    {
+        for( const key in dict )
+        {
+            this.add_item(dict[key]);
+        }
+    }
+
+    add_item(item)
+    {
+        const id = item['id'];
+        this.add_to_tree(item['expanded_name'], id, this.expanded_name_trie);
+        this.add_to_tree(item['small_name'], id, this.small_name_trie);
+        this.add_to_tree(item['string'], id, this.string_trie);
+    }
+
+    add_to_tree(str, id, trie)
+    {
+        let inner_trie = trie;
+        while( str )
+        {
+            if( !inner_trie[str.charAt(0)] )
+            {
+                var new_trie = {};
+                inner_trie[str.charAt(0)] = new_trie;
+            }
+            else
+            {
+                var new_trie = inner_trie[str.charAt(0)];
+            }
+
+            if( str.length == 1 )
+            {
+                new_trie.isComplete = true;
+                if( !new_trie.ids )
+                {
+                    new_trie.ids = [];
+                }
+                new_trie.ids.push(id);
+            }
+            inner_trie = new_trie;
+            str = str.substring(1);
+        }
+    }
+
+    search(input)
+    {
+        if( input.length == 0 && !this.show_from_noentry){
+            this.dropdown([]);
+            return;
+        }
+        else if( input.length == 0 && this.show_from_noentry)
+        {
+            this.dropdown(this.items); //show all items
+        }
+        else
+        {
+            const trees = []
+            const tr1 = this.getSubtree(input, this.expanded_name_trie);
+            trees.push(tr1);
+            const tr2 = this.getSubtree(input, this.small_name_trie);
+            trees.push(tr2);
+            const tr3 = this.getSubtree(input, this.string_trie);
+            trees.push(tr3);
+            const results = this.collate(trees);
+            this.dropdown(results);
+        }
+    }
+
+    getSubtree(input, given_trie)
+    {
+        /*
+        recursive function to return the trie accessed at input
+        */
+
+        if( input.length == 0 ){
+            return given_trie;
+        }
+
+        else{
+            const substr = input.substring(0, input.length - 1);
+            const last_char = input.charAt(input.length-1);
+            const subtrie = this.getSubtree(substr, given_trie);
+
+            if( !subtrie ) //substr not in the trie
+            {
+                return {};
+            }
+
+            const indexed_trie = subtrie[last_char];
+            return indexed_trie;
+        }
+    }
+
+    serialize(trie)
+    {
+        /*
+        takes in a trie and returns a list of its item id's
+        */
+        let itemIDs = [];
+        if ( !trie )
+        {
+            return itemIDs; //empty, base case
+        }
+        for( const key in trie )
+        {
+            if(key.length > 1)
+            {
+                continue;
+            }
+            itemIDs = itemIDs.concat(this.serialize(trie[key]));
+        }
+        if ( trie.isComplete )
+        {
+            itemIDs.push(...trie.ids);
+        }
+
+        return itemIDs;
+    }
+
+    collate(trees)
+    {
+        /*
+        takes a list of tries
+        returns a list of ids of objects that are available
+        */
+        const results = [];
+        for( const tree of trees )
+        {
+            const available_IDs = this.serialize(tree);
+
+            for( const itemID of available_IDs ) {
+                results[itemID] = this.items[itemID];
+            }
+        }
+        return results;
+    }
+
+    generate_element_text(obj)
+    {
+        const content_strings = [obj.expanded_name, obj.small_name, obj.string].filter(x => Boolean(x));
+        const result = content_strings.shift();
+        if( result == null || content_strings.length < 1) {
+            return result;
+        } else {
+            return result + " (" + content_strings.join(", ") + ")";
+        }
+    }
+
+    dropdown(ids)
+    {
+        /*
+        takes in a mapping of ids to objects in  items
+        and displays them in the dropdown
+        */
+        const drop = document.getElementById("drop_results");
+        while(drop.firstChild)
+        {
+            drop.removeChild(drop.firstChild);
+        }
+
+        for( const id in ids )
+        {
+            const result_entry = document.createElement("li");
+            const result_button = document.createElement("a");
+            const obj = this.items[id];
+            const result_text = this.generate_element_text(obj);
+            result_button.appendChild(document.createTextNode(result_text));
+            result_button.onclick = function() { searchable_select_multiple_widget.select_item(obj.id); };
+            const tooltip = document.createElement("span");
+            const tooltiptext = document.createTextNode(result_text);
+            tooltip.appendChild(tooltiptext);
+            tooltip.setAttribute('class', 'entry_tooltip');
+            result_button.appendChild(tooltip);
+            result_entry.appendChild(result_button);
+            drop.appendChild(result_entry);
+        }
+
+        const scroll_restrictor = document.getElementById("scroll_restrictor");
+
+        if( !drop.firstChild )
+        {
+            scroll_restrictor.style.visibility = 'hidden';
+        }
+        else
+        {
+            scroll_restrictor.style.visibility = 'inherit';
+        }
+    }
+
+    select_item(item_id)
+    {
+        if( (this.selectable_limit > -1 && this.added_items.size < this.selectable_limit) || this.selectable_limit < 0 )
+        {
+            this.added_items.add(item_id);
+        }
+        this.update_selected_list();
+        // clear search bar contents
+        document.getElementById("user_field").value = "";
+        document.getElementById("user_field").focus();
+        this.search("");
+    }
+
+    remove_item(item_id)
+    {
+        this.added_items.delete(item_id);
+
+        this.update_selected_list()
+        document.getElementById("user_field").focus();
+    }
+
+    update_selected_list()
+    {
+        document.getElementById("added_number").innerText = this.added_items.size;
+        const selector = document.getElementById('selector');
+        selector.value = JSON.stringify([...this.added_items]);
+        const added_list = document.getElementById('added_list');
+
+        while(selector.firstChild)
+        {
+            selector.removeChild(selector.firstChild);
+        }
+        while(added_list.firstChild)
+        {
+            added_list.removeChild(added_list.firstChild);
+        }
+
+        let list_html = "";
+
+        for( const item_id of this.added_items )
+        {
+            const item = this.items[item_id];
+
+            const element_entry_text = this.generate_element_text(item);
+
+            list_html += '<div class="list_entry">'
+                + '<p class="added_entry_text">'
+                + element_entry_text
+                + '</p>'
+                + '<button onclick="searchable_select_multiple_widget.remove_item('
+                + item_id
+                + ')" class="btn-remove btn">remove</button>';
+            list_html += '</div>';
+        }
+        added_list.innerHTML = list_html;
+    }
+}