分析CMMS系统笔记使用js控制快捷键

使用js控制快捷键

/**
 * Events are handled for different browsers.
 */
CalemLogin._handleKeyEvents =
function(event) {
    event = event || window.event; //Either passed in or directly from window
    if (event == null) return true;
    
    var target = event.target ? event.target: event.srcElement; //get the target of the event
    if (!target) return true;    
    
    //Process key presses
    var keyCode = event.keyCode || event.charCode;
    if (keyCode == 13) { // Enter key   点击entry按钮时提交
      if (target.id==CalemLogin.usernameEl) {//Move to password
         document.getElementById(CalemLogin.passwordEl).focus();
      } else if ( (target.id==CalemLogin.passwordEl || target.id==CalemLogin.loginEl)
                  && document.getElementById(CalemLogin.loginEl).disabled==false) {
         CalemLogin._attemptLogin();
      }
        CalemLogin._cancelEvent(event);
        return false;
    } else if (keyCode == 9) { // Tab
      var handled=false;
      var shiftKey = event.shiftKey;
      if (shiftKey) {
         if (target.id==CalemLogin.usernameEl) {
            handled=true;
            if (document.getElementById(CalemLogin.loginEl).disabled) {
               //Do no do anything - cannot move on to disabled button.
            } else {
               document.getElementById(CalemLogin.loginEl).focus();
            }
         } else if (target.id==CalemLogin.loginEl) {
            document.getElementById(CalemLogin.passwordEl).focus();
            handled=true;
         }
      } else if (target.id==CalemLogin.loginEl) { //Do not tab into the browser window
           document.getElementById(CalemLogin.usernameEl).focus();
           handled=true;           
        } else if (target.id==CalemLogin.passwordEl 
                     && document.getElementById(CalemLogin.loginEl).disabled) {
           //Cannot move to disabled
           handled=true;
        }
        if (handled) {
           CalemLogin._cancelEvent(event);
           return false;
        }
    }
    //Not handling here
    return true;
}