WSH JScript single-character input ?

Discussion in 'Javascript' started by Dr J R Stockton, Dec 4, 2011.

  1. Can command-line JScript, running in Windows script Host, read a
    *single* character from the keyboard without needing Enter? My old
    16-bit Pascal directory program HUNT accepts single-character responses
    for Yes/No/Quit, and it would be nice to have my 32-bit WSH version of
    it do the same.

    If anyone wants to look, the WSH is SEAKFYLE.JS ("documentation" is
    SEAKFYLE.HTM), which is called by SEEK.BAT, all linked from
    Dr J R Stockton, Dec 4, 2011
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  2. Dr J R Stockton

    Evertjan. Guest

    Dr J R Stockton wrote on 04 dec 2011 in microsoft.public.scripting.jscript:
    StIn without pipe will read from the keyboard.

    ========== test.js ===========
    var input = '';
    while (!WScript.StdIn.AtEndOfLine) {
    input += WScript.StdIn.Read(1) + '-';

    run with cscript [wscript has no StIn] in the cmd-console:

    cscript test.js
    Evertjan., Dec 5, 2011
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  3. Requires Enter.
    Dr J R Stockton, Dec 5, 2011
  4. Dr J R Stockton

    Evertjan. Guest

    Dr J R Stockton wrote on 05 dec 2011 in comp.lang.javascript:
    Then I guess it cannot be done, as shown by scriptingguy in 2004:

    Evertjan., Dec 5, 2011
  5. Dr J R Stockton

    Tom Lavedas Guest

    I wrote a JScript routine a little while back that used Sendkeys to
    implement a one-letter routine that didn't need an enter key and
    supported a timeout. Unfortunately, Win7 disables Sendkeys in a
    command window, so it's now broken. On the other hand, Win7 added
    Choice.exe back to the utility list. It supports single keystroke

    I also wrote this little batch kludge that receives single key strokes
    Y/N and control-C for cancel ...

    :: YN.cmd - Yes/No/Cancelled test
    @echo off
    SET /P =Your answer (Y/N)?<nul
    for /f "tokens=2 delims=?" %%a in (
    'xcopy %temp%.\1 %temp%.\1 /p /y ^< con 2^>NUL ^|find "?"'
    ) do set "Answer=%%a"
    del %temp%.\1
    ECHO.%Answer% % optional %
    if "%Answer%"==" " ECHO Cancelled % optional % & exit /b 255
    echo %Answer%| find /i "y" >NUL
    if errorlevel 1 ECHO No % optional % & exit /b 1
    echo Yes % optional %

    It is not case sensitive. It returns three Errorlevels: Y = 0, N = 1,
    Cancel = 255.
    Tom Lavedas
    Tom Lavedas, Dec 5, 2011
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