Ujnotes — CC0 1.0
Working notes on Notes: if(!!var), undefined, Null, if (typeof something === \"undefined\"), Delete Node, and Parent.
Detect Null.
if(!!var)
Not Null.
Ie. also Not 0 (not effective for undefined).
undefined
=== undefined.
Null
===null.
________________.
Detect Undefined Object (Prevent Exception).
if (typeof something === "undefined")
Alert("something is undefined");.
________________.
Delete Node
Parent
E.parentNode.removeChild(e);.
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<script type="text/javascript">presentation()</script>Script content with src attribute is not executed.
Script updated by innerHtml is not executed.
________________.
Detect
http://diveintohtml5.info/everything.html
Library. Http://modernizr.com/.
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Get Text after substring.
Var s = "aijfoi aodsifj adofija afdoiajd?order_num=3216545";.
Var m = s.match(/([^\?]*)\?order_num=(\d*)/);.
Var num = m[2], rest = m[1];.
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Document.getElementById('classRight').style.display = 'none';.
Alternatively (not recommended). Document.getElementById("classRight").setAttribute("style","display:none;");.
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The function is called as soon as it is declared.
(.
Function (...).
{.
….
}.
)(...);.
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AddEventListner in Chrome.
AttachEvent in IE9.
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onclick
Pass this as param (to not have to refer using id).
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Open url and mailto
url - selfmailto - blank________________.
Break
Debugger;.
Log
Log Console.log(<message>);________________.
Cannot pass parameters to function pointer.
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Variable ‘hoisting’.
Variable initialized with.
________________.
In JavaScript, an undeclared variable is assigned the value undefined at execution and is also of type undefined.
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All undeclared variables are global variables.
Hoisting causes the variable declaration to implicitly occur at the top of current scope.
Assignment though occurs at usual spot.
‘use strict’ changes hoisting behaviour.
Variables are no longer hoisted.
