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Twitter-style autocomplete in textarea

Posted by: admin November 30, 2017 Leave a comment

Questions:

I am looking for a Javascript autocomplete implementation which includes the following:

  • Can be used in a HTML textarea
  • Allows for typing regular text without invoking autocomplete
  • Detects the @ character and starts autocomplete when it is typed
  • Loads list of options through AJAX

I believe that this is similar to what Twitter is doing when tagging in a tweet, but I can’t find a nice, reusable implementation.
A solution with jQuery would be perfect.

Thanks.

Answers:

I’m sure your problem is long since solved, but jquery-textcomplete looks like it would do the job.

Questions:
Answers:

Another great library which solves this problem At.js

Source

Demo

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Answers:

Have you tried this

GITHUB: https://github.com/podio/jquery-mentions-input

DEMO/CONFIG: http://podio.github.io/jquery-mentions-input/

It is pretty simple to implement.

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Answers:

I’ve created a Meteor package for this purpose. Meteor’s data model allows for fast multi-rule searching with custom rendered lists. If you’re not using Meteor for your web app, (I believe) you unfortunately won’t find anything this awesome for autocompletion.

Autocompleting users with @, where online users are shown in green:

enter image description here

In the same line, autocompleting something else with metadata and bootstrap icons:

enter image description here

Fork, pull, and improve:

https://github.com/mizzao/meteor-autocomplete

Questions:
Answers:

I could not find any solution that matched my requirements perfectly, so I ended up with the following:

I use the jQuery keypress() event to check for the user pressing the @ character.
If this is the case, a modal dialog is shown using jQuery UI. This dialog contains an autocomplete text field (many options can be used here, but I recommmend jQuery Tokeninput)
When the user selects an option in the dialog, a tag is added to the text field and the dialog is closed.

This is not the most elegant solution, but it works and it does not require extra keypresses compared to my original design.

Edit
So basically, we have our large text box where the user can enter text. He should be able to “tag” a user (this just means inserting #<userid> in the text). I attach to the jQuery keyup event and detect the @ character using (e.which == 64) to show a modal with a text field for selecting the users to tag.

The meat of the solution is simply this modal dialog with a jQuery Tokeninput text box. As the user types here, the list of users is loaded through AJAX. See the examples on the website for how to use it properly. When the user closes the dialog, I insert the selected IDs into the large text box.

Questions:
Answers:

Try this:

(function($){
    
        $.widget("ui.tagging", {
            // default options
            options: {
                source: [],
                maxItemDisplay: 3,
                autosize: true,
                animateResize: false,
                animateDuration: 50
            },
            _create: function() {
                var self = this;
                
                this.activeSearch = false;
                this.searchTerm = "";
                this.beginFrom = 0;
    
                this.wrapper = $("<div>")
                    .addClass("ui-tagging-wrap");
                
                this.highlight = $("<div></div>");
                
                this.highlightWrapper = $("<span></span>")
                    .addClass("ui-corner-all");
    
                this.highlightContainer = $("<div>")
                    .addClass("ui-tagging-highlight")
                    .append(this.highlight);
    
                this.meta = $("<input>")
                    .attr("type", "hidden")
                    .addClass("ui-tagging-meta");
    
                this.container = $("<div></div>")
                    .width(this.element.width())
                    .insertBefore(this.element)
                    .addClass("ui-tagging")
                    .append(
                        this.highlightContainer, 
                        this.element.wrap(this.wrapper).parent(), 
                        this.meta
                    );
                
                var initialHeight = this.element.height();
                
                this.element.height(this.element.css('lineHeight'));
                
                this.element.keypress(function(e) {
                    // activate on @
                    if (e.which == 64 && !self.activeSearch) {
                        self.activeSearch = true;
                        self.beginFrom = e.target.selectionStart + 1;
                    }
                    // deactivate on space
                    if (e.which == 32 && self.activeSearch) {
                        self.activeSearch = false;
                    }
                }).bind("expand keyup keydown change", function(e) {
                    var cur = self.highlight.find("span"),
                        val = self.element.val(),
                        prevHeight = self.element.height(),
                        rowHeight = self.element.css('lineHeight'),
                        newHeight = 0;
                    cur.each(function(i) {
                        var s = $(this);
                        val = val.replace(s.text(), $("<div>").append(s).html());
                    });
                    self.highlight.html(val);
                    newHeight = self.element.height(rowHeight)[0].scrollHeight;
                    self.element.height(prevHeight);
                    if (newHeight < initialHeight) {
                        newHeight = initialHeight;
                    }
                    if (!$.browser.mozilla) {
                        if (self.element.css('paddingBottom') || self.element.css('paddingTop')) {
                            var padInt =
                                parseInt(self.element.css('paddingBottom').replace('px', '')) + 
                                parseInt(self.element.css('paddingTop').replace('px', ''));
                            newHeight -= padInt;
                        }
                    }
                    self.options.animateResize ?
                        self.element.stop(true, true).animate({
                                height: newHeight
                            }, self.options.animateDuration) : 
                        self.element.height(newHeight);
                    
                    var widget = self.element.autocomplete("widget");
                        widget.position({
                            my: "left top",
                            at: "left bottom",
                            of: self.container
                        }).width(self.container.width()-4);
                    
                }).autocomplete({
                    minLength: 0,
                    delay: 0,
                    maxDisplay: this.options.maxItemDisplay,
                    open: function(event, ui) {
                        var widget = $(this).autocomplete("widget");
                        widget.position({
                            my: "left top",
                            at: "left bottom",
                            of: self.container
                        }).width(self.container.width()-4);
                    },
                    source: function(request, response) {
                        if (self.activeSearch) {
                            self.searchTerm = request.term.substring(self.beginFrom); 
                            if (request.term.substring(self.beginFrom - 1, self.beginFrom) != "@") {
                                self.activeSearch = false;
                                self.beginFrom = 0;
                                self.searchTerm = "";
                            }
                            if (self.searchTerm != "") {
                                
                                if ($.type(self.options.source) == "function") {
                                    self.options.source(request, response);                   
                                } else {
                                    var re = new RegExp("^" + escape(self.searchTerm) + ".+", "i");
                                    var matches = [];
                                    $.each(self.options.source, function() {
                                        if (this.label.match(re)) {
                                            matches.push(this);
                                        }
                                    });
                                    response(matches);
                                }
                            }
                        }
                    },
                    focus: function() {
                        // prevent value inserted on focus
                        return false;
                    },
                    select: function(event, ui) {
                        self.activeSearch = false;
                        //console.log("@"+searchTerm, ui.item.label);
                        this.value = this.value.replace("@" + self.searchTerm, ui.item.label) + ' ';
                        self.highlight.html(
                            self.highlight.html()
                                .replace("@" + self.searchTerm,
                                         $("<div>").append(
                                             self.highlightWrapper
                                                 .text(ui.item.label)
                                                 .clone()
                                         ).html()+' ')
                        );
                            
                        self.meta.val((self.meta.val() + " @[" + ui.item.value + ":]").trim());
                        return false;
                    }
                });
    
            }
        });
body, html {
        font-family: "lucida grande",tahoma,verdana,arial,sans-serif;
    }
    
    .ui-tagging {
        position: relative;
        border: 1px solid #B4BBCD;
        height: auto;
    }
    
    .ui-tagging .ui-tagging-highlight {
        position: absolute;
        padding: 5px;
        overflow: hidden;
    }
    .ui-tagging .ui-tagging-highlight div {
        color: transparent;
        font-size: 13px;
        line-height: 18px;
        white-space: pre-wrap;
    }
    
    .ui-tagging .ui-tagging-wrap {
        position: relative;
        padding: 5px;
        overflow: hidden;
        zoom: 1;
        border: 0;
    }
    
    .ui-tagging div > span {
        background-color: #D8DFEA;
        font-weight: normal !important;
    }
    
    .ui-tagging textarea {
        display: block;
        font-family: "lucida grande",tahoma,verdana,arial,sans-serif;
        background: transparent;
        border-width: 0;
        font-size: 13px;
        height: 18px;
        outline: none;
        resize: none;
        vertical-align: top;
        width: 100%;
        line-height: 18px;
        overflow: hidden;
    }
    
    .ui-autocomplete {
        font-size: 13px;
        background-color: white;
        border: 1px solid black;
        margin-bottom: -5px;
        width: 0;
    }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<textarea></textarea>

http://jsfiddle.net/mekwall/mcWnL/52/
This link will help you

Questions:
Answers:

Recently i had to face this problem and this is how i nailed down…

  1. Get the string index at the cursor position in the textarea by using selectionStart
  2. slice the string from index 0 to the cursor position
  3. Insert it into a span (since span has multiple border boxes)
  4. Get the dimensions of the border box using element.getClientRects() relative to the view port. (here is the MDN Reference)
  5. Calculate the top and left and feed it to the dropdown

This works in all latest browsers. haven’t tested at old ones

Here is Working bin

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THIS should work. With regards to the @ kicking off the search, just add (dynamically or not) the symbol to the beginning of each possible search term.