love.textinput

Available since LÖVE 0.9.0

This function is not supported in earlier versions.

Called when text has been entered by the user. For example if shift-2 is pressed on an American keyboard layout, the text "@" will be generated.

Function

Synopsis

love.textinput( text )

Arguments

string text

The UTF-8 encoded unicode text.

Returns

Nothing.

Notes

Although Lua strings can store UTF-8 encoded unicode text just fine, many functions in Lua's string library will not treat the text as you might expect. For example, #text (and string.len(text)) will give the number of bytes in the string, rather than the number of unicode characters. The Lua wiki and a presentation by one of Lua's creators give more in-depth explanations, with some tips.

The utf8 library can be used to operate on UTF-8 encoded unicode text (such as the text argument given in this function.)

On Android and iOS, textinput is disabled by default; call love.keyboard.setTextInput to enable it.

Examples

Record and print text the user writes.

function love.load()
    text = "Type away! -- "
end

function love.textinput(t)
    text = text .. t
end

function love.draw()
    love.graphics.printf(text, 0, 0, love.graphics.getWidth())
end

Print text the user writes, and erase text when backspace is pressed.

local utf8 = require("utf8")

function love.load()
    text = "Type away! -- "

    -- enable key repeat so backspace can be held down to trigger love.keypressed multiple times.
    love.keyboard.setKeyRepeat(true)
end

function love.textinput(t)
    text = text .. t
end

function love.keypressed(key)
    if key == "backspace" then
        -- get the byte offset to the last UTF-8 character in the string.
        local byteoffset = utf8.offset(text, -1)

        if byteoffset then
            -- remove the last UTF-8 character.
            -- string.sub operates on bytes rather than UTF-8 characters, so we couldn't do string.sub(text, 1, -2).
            text = string.sub(text, 1, byteoffset - 1)
        end
    end
end

function love.draw()
    love.graphics.printf(text, 0, 0, love.graphics.getWidth())
end

See Also

• love
• love.keypressed
• love.keyboard.setTextInput
• love.keyboard.hasTextInput
• utf8

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