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Re: How to detect key pressed plus mouse click, e.g., ctrl + left click

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Andrew Poulos <ap_prog@hotmail.com> wrote on 22 feb 2014 in 
comp.lang.javascript:

>> document.onmousedown = function(e) {
>>    var e = e || window.event;
>>    if (e.shiftKey || e.altKey || e.ctrlKey)
>>      alert ( "shiftKey=" + e.shiftKey + "\naltKey="
>>      + e.altKey + "\nctrlKey=" + e.ctrlKey );
>> };
> 
> I notice that you put a "var" before the "e". Is that really necessary?

Yes.

Otherwise the statement could overwrite an "outside" variable e:

var e = 3;
alert(e); // 3
test2();
alert(e); // 3
test1();
alert(e); // 5

function test1() {
   e = 5;
};

function test2() {
   var e = 7;
};





-- 
Evertjan.
The Netherlands.
(Please change the x'es to dots in my emailaddress)

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How to detect key pressed plus mouse click, e.g., ctrl + left click "Joey@still_Learning.invalid" <Joey@still_Learning.invalid> - 2014-02-21 10:45 -0800
  Re: How to detect key pressed plus mouse click, e.g., ctrl + left click "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2014-02-21 20:04 +0100
    Re: How to detect key pressed plus mouse click, e.g., ctrl + left click "Joey@still_Learning.invalid" <Joey@still_Learning.invalid> - 2014-02-21 11:21 -0800
      Re: How to detect key pressed plus mouse click, e.g., ctrl + left click "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2014-02-21 20:32 +0100
        Re: How to detect key pressed plus mouse click, e.g., ctrl + left click "Joey@still_Learning.invalid" <Joey@still_Learning.invalid> - 2014-02-21 14:24 -0800
          Re: How to detect key pressed plus mouse click, e.g., ctrl + left click "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2014-02-22 00:31 +0100
            Re: How to detect key pressed plus mouse click, e.g., ctrl + left click "Joey@still_Learning.invalid" <Joey@still_Learning.invalid> - 2014-02-21 17:41 -0800
        Re: How to detect key pressed plus mouse click, e.g., ctrl + left click Andrew Poulos <ap_prog@hotmail.com> - 2014-02-22 12:48 +1100
          Re: How to detect key pressed plus mouse click, e.g., ctrl + left click "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2014-02-22 10:36 +0100
          Re: How to detect key pressed plus mouse click, e.g., ctrl + left click Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-02-22 10:54 +0100
            Re: How to detect key pressed plus mouse click, e.g., ctrl + left click "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2014-02-22 11:19 +0100
              Re: How to detect key pressed plus mouse click, e.g., ctrl + left click Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-02-22 11:27 +0100
                Re: How to detect key pressed plus mouse click, e.g., ctrl + left click "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2014-02-22 11:39 +0100
                Re: How to detect key pressed plus mouse click, e.g., ctrl + left click Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-02-22 12:50 +0100
                Re: How to detect key pressed plus mouse click, e.g., ctrl + left click Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-02-22 12:56 +0100
                Re: How to detect key pressed plus mouse click, e.g., ctrl + left click John Harris <niam@jghnorth.org.uk.invalid> - 2014-02-23 14:00 +0000
            Re: How to detect key pressed plus mouse click, e.g., ctrl + left click Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-02-23 23:48 +0100
              Re: How to detect key pressed plus mouse click, e.g., ctrl + left click Joao Rodrigues <groups_jr-1@yahoo.com.br> - 2014-02-23 20:04 -0300
            Re: How to detect key pressed plus mouse click, e.g., ctrl + left click Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-02-23 23:39 +0100

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