path: root/src/templates/dashboard/searchable_select_multiple.html

<script src="https://code.jquery.com/jquery-2.2.4.min.js"></script>

<div class="autocomplete">
    <div id="warning_pane" style="background: #FFFFFF; color: #CC0000;">
        {% if incompatible == "true" %}
        <h3>Warning: Incompatible Configuration</h3>
        <p>Please make a different selection, as the current config conflicts with the selected pod</p>
        {% endif %}
    </div>

    <div id="added_list">

    </div>
    <div id="added_counter">
        <p id="added_number">0</p>
        <p id="addable_limit">/ {% if selectable_limit > -1 %} {{ selectable_limit }} {% else %} &infin; {% endif %}added</p>
    </div>

    <input id="user_field" name="ignore_this" class="form-control" autocomplete="off" type="text" placeholder="{{placeholder}}" value="" oninput="search(this.value)"
    {% if disabled %} disabled {% endif %}
    >
    </input>

    <input type="hidden" id="selector" name="{{ name }}" class="form-control" style="display: none;"
    {% if disabled %} disabled {% endif %}
    >
    </input>

    <div id="scroll_restrictor">
        <ul id="drop_results"></ul>
    </div>
    <style>
        #scroll_restrictor {
            flex: 1;
            position: relative;
            overflow-y: auto;
        }
        .autocomplete {
            display: flex;
            flex: 1;
            flex-direction: column;
        }
        #user_field {
            font-size: 14pt;
            padding: 5px;

        }

        #drop_results{
            list-style-type: none;
            padding: 0;
            margin: 0;
            min-height: 0;
            border: solid 1px #ddd;
            border-top: none;
            border-bottom: none;
            visibility: hidden;
            flex: 1;

            position: absolute;
            width: 100%;
            box-shadow: rgba(0, 0, 0, 0.19) 0px 10px 20px, rgba(0, 0, 0, 0.23) 0px 6px 6px;

        }

        #drop_results li a{
            font-size: 14pt;
            background-color: #f6f6f6;
            padding: 7px;
            text-decoration: none;
            display: block;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }

        #drop_results li a {
            border-bottom: 1px solid #ddd;
        }

        .list_entry {
            border: 1px solid #ccc;
            border-radius: 5px;
            margin-top: 5px;
            vertical-align: middle;
            line-height: 40px;
            height: 40px;
            padding-left: 12px;
            width: 100%;
            display: flex;
        }

        #drop_results li a:hover{
            background-color: #ffffff;
        }

        .added_entry_text {
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            display: inline;
            width: 100%;
        }

        .btn-remove {
            float: right;
            height: 30px;
            margin: 4px;
            padding: 1px;
            max-width: 20%;
            width: 15%;
            min-width: 70px;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .entry_tooltip {
            display: none;
        }

        #drop_results li a:hover .entry_tooltip {
            position: absolute;
            background: #444;
            color: #ddd;
            text-align: center;
            font-size: 12pt;
            border-radius: 3px;

        }

        #drop_results {
            max-width: 100%;
            display: inline-block;
            list-style-type: none;
            overflow: hidden;
            white-space: nowrap;
            text-overflow: ellipsis;
        }

        #drop_results li {
            overflow: hidden;
            text-overflow: ellipsis;
        }

        #added_counter {
            text-align: center;
        }

        #added_number, #addable_limit {
            display: inline;
        }
    </style>
</div>

<script type="text/javascript">
    //flags
    var show_from_noentry = {{show_from_noentry|yesno:"true,false"}}; // whether to show any results before user starts typing
    var show_x_results = {{show_x_results|default:-1}}; // how many results to show at a time, -1 shows all results
    var results_scrollable = {{results_scrollable|yesno:"true,false"}}; // whether list should be scrollable
    var selectable_limit = {{selectable_limit|default:-1}}; // how many selections can be made, -1 allows infinitely many
    var placeholder = "{{placeholder|default:"begin typing"}}"; // placeholder that goes in text box

    //needed info
    var items = {{items|safe}} // items to add to trie. Type is a dictionary of dictionaries with structure:
        /*
        {
            id# : {
                "id": any, identifiable on backend
                "small_name": string, displayed first (before separator), searchable (use for e.g. username)
                "expanded_name": string, displayed second (after separator), searchable (use for e.g. email address)
                "string": string, not displayed, still searchable
            }
        }
        */

    /* used later:
    {{ selectable_limit }}: changes what number displays for field
    {{ name }}: form identifiable name, relevant for backend
        // when submitted, form will contain field data in post with name as the key
    {{ placeholder }}: "greyed out" contents put into search field initially to guide user as to what they're searching for
    {{ initial }}: in search_field_init(), marked safe, an array of id's each referring to an id from items
    */

    //tries
    var expanded_name_trie = {}
    expanded_name_trie.isComplete = false;
    var small_name_trie = {}
    small_name_trie.isComplete = false;
    var string_trie = {}
    string_trie.isComplete = false;

    var added_items = [];

    search_field_init();

    if( show_from_noentry )
    {
        search("");
    }

    function disable() {
        var textfield = document.getElementById("user_field");
        var drop = document.getElementById("drop_results");

        textfield.disabled = "True";
        drop.style.display = "none";

        var btns = document.getElementsByClassName("btn-remove");
        for( var i = 0; i < btns.length; i++ )
        {
            btns[i].classList.add("disabled");
        }
    }

    function search_field_init() {
        build_all_tries(items);

        var initial = {{ initial|safe }};

        for( var i = 0; i < initial.length; i++)
        {
            select_item(String(initial[i]));
        }
        if(initial.length == 1)
        {
            search(items[initial[0]]["small_name"]);
            document.getElementById("user_field").value = items[initial[0]]["small_name"];
        }
    }

    function build_all_tries(dict)
    {
        for( var i in dict )
        {
            add_item(dict[i]);
        }
    }

    function add_item(item)
    {
        var id = item['id'];
        add_to_tree(item['expanded_name'], id, expanded_name_trie);
        add_to_tree(item['small_name'], id, small_name_trie);
        add_to_tree(item['string'], id, string_trie);
    }

    function add_to_tree(str, id, trie)
    {
        inner_trie = trie;
        while( str )
        {
            if( !inner_trie[str.charAt(0)] )
            {
                new_trie = {};
                inner_trie[str.charAt(0)] = new_trie;
            }
            else
            {
                new_trie = inner_trie[str.charAt(0)];
            }

            if( str.length == 1 )
            {
                new_trie.isComplete = true;
                new_trie.itemID = id;
            }
            inner_trie = new_trie;
            str = str.substring(1);
        }
    }

    function search(input)
    {
        if( input.length == 0 && !show_from_noentry){
            dropdown([]);
            return;
        }
        else if( input.length == 0 && show_from_noentry)
        {
            dropdown(items); //show all items
        }
        else
        {
            var trees = []
            var tr1 = getSubtree(input, expanded_name_trie);
            trees.push(tr1);
            var tr2 = getSubtree(input, small_name_trie);
            trees.push(tr2);
            var tr3 = getSubtree(input, string_trie);
            trees.push(tr3);
            var results = collate(trees);
            dropdown(results);
        }
    }

    function getSubtree(input, given_trie)
    {
        /*
        recursive function to return the trie accessed at input
        */

        if( input.length == 0 ){
            return given_trie;
        }

        else{
        var substr = input.substring(0, input.length - 1);
        var last_char = input.charAt(input.length-1);
        var subtrie = getSubtree(substr, given_trie);
        if( !subtrie ) //substr not in the trie
        {
            return {};
        }
        var indexed_trie = subtrie[last_char];
        return indexed_trie;
        }
    }

    function serialize(trie)
    {
        /*
        takes in a trie and returns a list of its item id's
        */
        var itemIDs = [];
        if ( !trie )
        {
            return itemIDs; //empty, base case
        }
        for( var key in trie )
        {
            if(key.length > 1)
            {
                continue;
            }
            itemIDs = itemIDs.concat(serialize(trie[key]));
        }
        if ( trie.isComplete )
        {
            itemIDs.push( trie.itemID );
        }

        return itemIDs;
    }

    function collate(trees)
    {
        /*
        takes a list of tries
        returns a list of ids of objects that are available
        */
        results = [];
        for( var i in trees )
        {
            var available_IDs = serialize(trees[i]);
            for( var j=0; j<available_IDs.length; j++){
                var itemID = available_IDs[j];
                results[itemID] = items[itemID];
            }
        }
        return results;
    }

    function generate_element_text(obj)
    {
        var content_strings = [obj['expanded_name'], obj['small_name'], obj['string']].filter(x => Boolean(x));
        var result = content_strings.shift();
        if( result == null || content_strings.length < 1) return result;
        return result + " (" + content_strings.join(", ") + ")";
    }

    function dropdown(ids)
    {
        /*
        takes in a mapping of ids to objects in  items
        and displays them in the dropdown
        */
        var drop = document.getElementById("drop_results");
        while(drop.firstChild)
        {
            drop.removeChild(drop.firstChild);
        }

        for( var id in ids )
        {
            var result_entry = document.createElement("li");
            var result_button = document.createElement("a");
            var obj = items[id];
            var result_text = generate_element_text(obj);
            result_button.appendChild(document.createTextNode(result_text));
            result_button.setAttribute('onclick', 'select_item("' + obj['id'] + '")');
            var tooltip = document.createElement("span");
            var 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);
        }

        if( !drop.firstChild )
        {
            drop.style.visibility = 'hidden';
        }
        else
        {
            drop.style.visibility = 'inherit';
        }
    }

    function select_item(item_id)
    {
        //TODO make faster
        var item = items[item_id]['id'];
        if( (selectable_limit > -1 && added_items.length < selectable_limit) || selectable_limit < 0 )
        {
            if( added_items.indexOf(item) == -1 )
            {
                added_items.push(item);
            }
        }
        update_selected_list();
        document.getElementById("user_field").focus();
    }

    function remove_item(item_ref)
    {
        item = Object.values(items)[item_ref];
        var index = added_items.indexOf(item);
        added_items.splice(index, 1);

        update_selected_list()
        document.getElementById("user_field").focus();
    }

    function update_selected_list()
    {
        document.getElementById("added_number").innerText = added_items.length;
        selector = document.getElementById('selector');
        selector.value = JSON.stringify(added_items);
        added_list = document.getElementById('added_list');

        while(selector.firstChild)
        {
            selector.removeChild(selector.firstChild);
        }
        while(added_list.firstChild)
        {
            added_list.removeChild(added_list.firstChild);
        }

        list_html = "";

        for( var key in added_items )
        {
            item_id = added_items[key];
            item = items[item_id];

            var element_entry_text = generate_element_text(item);

            list_html += '<div class="list_entry">'
                + '<p class="added_entry_text">'
                + element_entry_text
                + '</p>'
                + '<button onclick="remove_item('
                + Object.values(items).indexOf(item)
                + ')" class="btn-remove btn">remove</button>';
                list_html += '</div>';
        }

        added_list.innerHTML = list_html;
    }

</script>