Create Removable Item Buttons Generated From Select or Comma-separated Input elements with HTML, CSS and JS

I am currently working on a larger project at the moment that requires a lot of front-end wrangling. As a part of this project, I needed to create Button Items that are generated by the user from both an HTML select element for one section and, a comma-separated text input in another section.

When a user selects an item from a select menu, a button appears in a desired area with the name of the selection and a small “X” that can be clicked to remove the item. Likewise, if a user wishes to create a bunch of items separated by commas in an input element and either hit the “Enter” or the “Add” button, then those items will be transformed as a bunch of individual buttons that the user can remove and change.

The buttons essentially become the user’s selection of items.

I also needed to be able to get a list of those item buttons for when I submit a form server-side or for some other task.

As a result, I created a small library called itemButton().

Note: If you have a bit of experience with front-end, then all you may need is to grab the CSS code and input.js file. If you need some further explanation you can find the information below.

What it does

The itemButton() library:

  1. Creates a button named by the selection or the user’s input, This is removable should the user wish to change their choices.
  2. Allows you to select the max number of items you want your users to be able to choose.
  3. Easily extracts a list of buttons by ID and value.

An example

Take a look at an example:

My inability to consistently fail to place an ‘e’ at the end of giraffe notwithstanding, you can see that the user can select items from a select element and they will be displayed in a chosen area below. Further, when the user types some words and separates them by a comma they are displayed as buttons in a div below it.

Limit the number of displayed Item Buttons

You might have also noted that the select element will only display two-item buttons, while the comma-separated list will display up to 10. You are able to create a maximum limit of any of your text input or select elements you are running itemButton() on.

Validation

When the user submits their items, itemButton() will:

  • Check for duplicates. If it already exists, it won’t be displayed again.
  • Remove any empty comma-separated elements.
  • Remove any non-alphanumeric characters.
  • Cut any text input items between commas to less than or equal to 25 characters (You can change this if you want).
  • Exchange any spaces between words with a dash for the button ID.
  • Any item starting with a number gets and “a” at the start of the button ID so it can be used in the HTML.

Getting a list if item buttons

As you can see in the video above, when the user clicks the Log Items button, an object of ids and values for each item is listed in the browser console using the list() method in itemButton(). This is most useful for when you are submitting data to the server.

Let’s have a gander at the code:

The Code

I have chosen to put the Javascript itemButton() library in an input.js file. In my project,  I have other small classes or libraries in that file too. It is up to you how you want to add the code.

The CSS for the buttons is separate, and I have added it to my universal style.css file. Again you can put it anywhere you think works for you.

input.js

stlye.css

Add this to your main CSS file.

Quick use guide

Create the select button or input button

First, you will need to create your select or text input elements. Make sure that they have an appropriate ID that we can reference later.  You can have as many select or text input elements as you want to reference the itemButton() class.

Take a look at the example below:

Here we have added a select element with an id of “items”. We also have a text input with an ID of “tags”. The “tags” element also has an “addTag” button that the user can use to add their tags.

Create a div or span for your item buttons to go

Next, we need to create a location to display your item buttons. In the example below, I have used a div directly below the select or input elements.

Importing the itemButton() code

Our next step will be inside the script tags of our HTML file. If you are importing just the input.js file into your HTML file you will need to invoke you script tags as a module :

If you are importing more than one file, like I am in the example, I recommend you import your Javascript files like this:

In the example above, my two files are in the resources folder. The items.js file is just the file I have stored my list of select items.

Add event  listeners

Your next task is to add event listeners for each of your elements. For me, I will add an “input” event for my select element.

For my text input, I will add both a “keypress” (Enter) listener if the user hits enter after typing in their items in the “tags” text input or a “click” if they hit the “Add” button. We will also clear out the tags after each use.

Take a look at the example:

itemButton()

itemButton().add()

Now it’s time to add the button. We do this inside each event listener.

The add() method takes three arguments:

  • items – A string containing a single item or comma-separated list of items.
  • selectionsLoc – This is a string containing the ID reference of the location you want to display your buttons, usually in a div or span.
  • >numSelections – The maximum total number of items you wish to have the user select.

itemButton().add(items, selectionsLoc, numSelections)

Back to our example for our select element, our item is the value of the current selection. The location that we want to display our item buttons is theitems-selection div and the maximum number of items that our user can add is 2.

For our text input, the value is the comma-separated string of values that the user enters. The location the button items will be displayed in will be the tags-selection div and we will allow the user to add up to 10 items.

itemButton().list()

To get a list of item buttons from any of your assigned areas that display them, you can use the list() method.

This method takes one argument, the element id that the item buttons are contained in. The list method will return an object of key-value pairs containing:

The example

This example file setup is as follow:

  • index.html
  • main.css
  • resources
    • inputs.js
    • items.js

Here is the sample HTML file below:

And the resources > items.js file for the select element.

The Wrap Up

I hope you found this small library useful for creating your own buttons. You may wish to make style changes to your buttons to match your own colour theme.

You may also wish to extend or reduce the length of characters for each item. You can do this in the input.js file on line 37.

You can download a copy of the example here:

itemButton.zip

I really like hearing how people apply these components to their own projects. Feel free to share in the comments below.

If you found this tool useful, please click the like button so I know that I am making good content. Or if you want to get updates on my latest posts, please subscribe (below the comments).

 

~Yagi

Google Apps Script – Javascript: Emulate the “Proper” Google Sheets Function

Google Apps Script / Javascript

I just had a recent email from a reader who asked how to tidy up a user’s inputted name from say, a Google Form so that all the first letters of each work in the name are capitalised in the same way that the Google Sheets Proper function does.

I thought it would be a good idea to provide a quick reference for the reader and myself for future projects.

The Code

Continue reading “Google Apps Script – Javascript: Emulate the “Proper” Google Sheets Function”

Creating Unique Ranges from 2D Arrays in Google Apps Script

Google Apps Script, Google Sheets, Javascript 

If you have ever done any work in Google Sheets you might have come across the incredibly useful UNIQUE function. This function can take a single row or multiple rows and generate a list of unique cell values.

UNIQUE demo Google Sheets

Sometime you might have a use case where you need to replicate the UNIQUE functionality in Google Apps Script. Maybe you are drawing in data from another source like an API, BigQuery or a database, or presenting your unique data in another format.

Whatever the case, knowing how to to create a unique array from a 1-dimensional array or a 2-dimensional array is an important part of your toolkit as a coding goat 🐐. This tutorial will look at how to create this with modern Javascript that is incorporated into the Google Apps Script language. And of course, we’ll focus our tutorial more on a Google Apps Script because that’s kinda our thing.

We’ll start off with a very basic example of creating a unique array from a 1-dimensional array in our code:

UNIQUE Array generated from a 1d array in GAS

…and then build ourselves up to a final example by grabbing multi-column range of Google Sheet data from which we create a unique list and then display the total sum corresponding to each unique cell value in each of our associated unique columns. Something like this:

UNIQUE 2-Array of multiple columns with result set in GAS
Click to Expand!

As we go through our examples I’ll display the runtime the entire code. Runtime is not a perfect indicator of the performance of the script there are other factors that will influence the runtime, but it will do for our purposes. I think you will be surprised by how fast these scripts run.

Before we get started, let’s take a quick look at the sample data…

Continue reading “Creating Unique Ranges from 2D Arrays in Google Apps Script”

Google Apps Script Course – Part 4: 2D Array Data Transformation of Multiple Question Multiple Group Items Data to Total Count of Rating Choices in Google Sheets

Google Apps Script, Google Sheets, SpreadsheetApp, 2d arrays

<<Part 3                                         <<Intro>>

In Part 3 of our 2D array data transformation course in Google Apps Script, we worked out how to get the count of each choice of each question item from the survey results in a Google Sheet.

This time we are going to add a final element to our mix. Let’s say we have multiple questions and multiple groups. We want to find out the count for each choice for each question for each group.

Continue reading “Google Apps Script Course – Part 4: 2D Array Data Transformation of Multiple Question Multiple Group Items Data to Total Count of Rating Choices in Google Sheets”

Google Apps Script: Basic Beginners Guide to Using Strings in Code

Google Apps Script, Javascript, strings

Hey there, Yagi here, you’ve probably stumbled across this page from a link from one of my other in-depth tutorials. This is just a quick primer on Javascript Strings in Google Apps Script for the non-coder.

Here’s a bare-bones example of how a string of text might come together in your code:

The resulting log would  look like this:

strings in Google Apps Script

 

Strings, +, \n and arrays[value]

If you are unfamiliar with basic string syntax and joining (concatenation), basically you can write text inside a single (‘) or double(“) quotation marks. For example:

To join two strings together you can concatenate them with a plus sign (+).

Just remember to put a space inside your quotation mars at the end if you are going to join another word or the words will not be spaced and theywillbealltogether.

This is handy when you want to put things on separate lines in your code but it won’t be on a separate line when it is displayed. You can use the newline escape sequence \n to return the next part of a string to a new line.

To insert a custom variable into a string, one fairly beginner-friendly approach is to put it between two plus signs.

You can see in the meatz variable above, we have put our two meat items in an array. An array always starts at zero (0). So to get chicken we would do, meatz[0].

 

Meow get on back to your main tutorial and get learn’n.

~Yagi