The HTML widget

The HTML widget adds unique functionality to a wrap using JavaScript. In this help page, we will use it to insert a button that tells the current time for the web browser. 

If you have a problem that would easily be solved using some JavaScript on the page, you can insert the missing functionality using a custom HTML widget. This widget has three parts:

  • Content for the <head> section of the wrap’s HTML.
  • HTML markup that goes into the <body> section of the wrap’s HTML.
  • JavaScript code for the <body> section to perform the function of the widget.

JavaScript is a potential vulnerability

Please note that we don’t provide a sandbox or similar extra security layer for the HTML widget. The JavaScript code you use will be run as-is on your production website. The code must sanitize all input data and conform to all the most recent security standards and conventions – and it may still constitute a vulnerability.

Insert a HTML widget

  1. Select the cell where you want the HTML code to appear in the wrap.
  2. Switch to the WrapCreator ribbon and click on Insert Widget.
  3. Select the HTML widget on the Widget tab in the task pane.
  4. Enter the required parameters on the Cell tab and press Apply.


Screenshot of the settings for the HTML widget


Content for the <head> section

Anything you put here will be inserted into the <head> section of the HTML for the wrap. You can insert anything that belongs here, including JavaScript code that you need to define or execute before the entire page has been loaded.

The contents of the field are copied as they are. If you add JavaScript, remember to surround the code with <script> tags.

HTML markup

This field contains the HTML required to create a physical representation of the widget, e.g. a button.

WrapCreator will place this markup in the <body> section of the wrap’s HTML at the position of the widget cell.

JavaScript code

When the HTML widget is activated, it usually runs a piece of JavaScript code. This code will be loaded in the <body> section of the wrap’s HTML.

To optimize performance, the code you store here will be saved in a file together with many other scripts. This file is loaded with a <script src=”<filename>” statement, so please don’t include any <script> tags with your code.

The script file is loaded with the defer attribute so don’t expect your code to be executable until the page has been fully loaded.

Known issue

The HTML widget does not validate the three input fields in any way. You must test and debug the widget in the same way as if you had entered the same HTML and JavaScript directly in the web page source.

Remove an HTML widget

To delete a field, widget, wrap function or signature that has been stored at least once in the live production database is not a trivial task. The instructions below are only applicable during the initial development of a wrap, before it has ever been used in production. Read more about making changes to your wraps.

To remove an HTML widget:

  1. Ensure that the task pane is visible.
  2. Select the widget’s cell.
  3. The task pane should now show the HTML widget’s settings on the Cell tab. If it doesn’t, you may have selected the wrong cell, or already removed the widget by mistake.
  4. Locate the Remove button at the bottom of the widget settings and click on it.

Wrap or merge cells?

The size of the output from a widget is constrained by the field in the wrap that corresponds to the widget cell. In the example below, the current time for the web browser is generated as a long text string:

Fri Jul 26 2019 14:52:05 GMT+0200 (Central European Summer Time)

If you place this HTML widget in an ordinary cell, the long text output does not fit the cell width and so it will wrap inside the cell:

Fri Jul 26
2019 14:52:
05 GMT+0200
 (Central E
uropean Sum
mer Time)

If this is not what you want, you have three options:

  1. Adjust the output to fit the column width, e.g. to just show the day, month and year of the date or the hours and minutes of the time.
  2. Increase the width of the entire column where the widget resides.
  3. Merge the widget cell with the cells to the right of it, to create an area that is sufficiently wide to hold the full output from the widget.

Read more in the Introduction to using widgets.

Example: Current time

Let’s look at an example of a custom HTML widget. The HTML below will generate a button in the wrap. If you press the button, it calls a script to show the date, time and time zone.

In the HTML field we put this markup:

<input type='button' value='Time' id='time_control_1_button' onclick='time_control_1_onclick()' />
<span id='time_control_1_span' name='time_control_1_span'></span>

In the JavaScript field we put this script:

function time_control_1_onclick() 
   return false;

It may not be the most powerful widget ever created but it is simple enough to serve as a demonstration.

Screenshot of a "get time" button defined as a custom HTML widget

Here’s how this wrap looks when it is loaded into the web browser:

Screenshot of a custom HTML widget before it is run

And here’s what it looks like when the Time button has been pressed.

Screenshot of a custom HTML widget after it has been run

Notice that the text string returned by the =Date() function call has wrapped over several lines in the widget’s cell. Instructions on how to avoid this can be found under Wrap or merge cells? above.