Unrecognized characters in search input

[samupl]

A bug in handling input from the user in the search makes "weird" unicode characters to appear.

Steps to reproduce

There are two methods of triggering this bug that I know of

Method 1 (works in multiple choice and single choice)

• Click on the select (you now should be able to type & the dropdown appears)
• Press Return (the first option should be selected)
• Type Uppercase "E" by holding Shift + E

A "�" character appears in the input.

Method 2

• Click on the select (you now should be able to type & the dropdown appears)
• Hold Ctrl and click on the input again, release Ctrl after click

A "�" character appears in the input.

Code description & solution

The bug is triggered in the mainClick() method. Every keyCode of every event that goes into this method gets converted to a string by String.fromCharCode() and put into the input, without verification.

Some keyup and keydown events, such as arrows, key-combos and special non-printable characters can be there as well. Fortunatelly, KeyboardEvent class contains a .charCode, that when used on onkeydown or onkeyup events returns "0".

I've opened up a PR that fixes this issue: #15

[samupl]

Merged and fixed by #15