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export function isReadOnly(element)
{
return element.hasAttribute('readonly')
}
// Gets <input/> selection bounds
export function getSelection(element)
{
// If no selection, return nothing
if (element.selectionStart === element.selectionEnd)
{
return
}
return { start: element.selectionStart, end: element.selectionEnd }
}
// Key codes
export const Keys =
{
Backspace : 8,
Delete : 46
}
// Finds out the operation to be intercepted and performed
// based on the key down event `keyCode`.
export function getOperation(event)
{
switch (event.keyCode)
{
case Keys.Backspace:
return 'Backspace'
case Keys.Delete:
return 'Delete'
}
}
// Gets <input/> caret position
export function getCaretPosition(element)
{
return element.selectionStart
}
// Sets <input/> caret position
export function setCaretPosition(element, caret_position)
{
// Sanity check
if (caret_position === undefined)
{
return
}
// Set caret position.
// There has been an issue with caret positioning on Android devices.
// https://github.com/catamphetamine/input-format/issues/2
// I was revisiting this issue and looked for similar issues in other libraries.
// For example, there's [`text-mask`](https://github.com/text-mask/text-mask) library.
// They've had exactly the same issue when the caret seemingly refused to be repositioned programmatically.
// The symptoms were the same: whenever the caret passed through a non-digit character of a mask (a whitespace, a bracket, a dash, etc), it looked as if it placed itself one character before its correct position.
// https://github.com/text-mask/text-mask/issues/300
// They seem to have found a basic fix for it: calling `input.setSelectionRange()` in a timeout rather than instantly for Android devices.
// https://github.com/text-mask/text-mask/pull/400/files
// I've implemented the same workaround here.
if (isAndroid()) {
setTimeout(() => element.setSelectionRange(caret_position, caret_position), 0)
} else {
element.setSelectionRange(caret_position, caret_position)
}
}
function isAndroid() {
// `navigator` is not defined when running mocha tests.
if (typeof navigator !== 'undefined') {
return ANDROID_USER_AGENT_REG_EXP.test(navigator.userAgent)
}
}
const ANDROID_USER_AGENT_REG_EXP = /Android/i
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