javascript String functions
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// multiline string old school tip trick
// create elemnt div style none or hidden with text
var sMulitilineString = document.getElementById('idHiddenDiv').innerHTML; // get text from hidden div
// ES6 with quotes
const htmlString = 'Say hello to
multi-line
strings!';
(typeof "813") // string
(typeof 813) // number
parseInt("10.33") // returns 10 string to integer
parseInt('2def8'); // 2
parseInt('a2def8'); // NaN
parseFloat("10.33") // returns 10.33 string to float
var test_1 = 'string';
var test_2 = ' example';
var suma = test_1 + test_2;
var length = suma.length; // 14
var le = test_1.length; // 6
charAt(index)
/* Returns the character at the specified index */
var str = new String('Sample');
str.charAt(3)); // p
// startsWith
var str = "HELLO WORLD";
var res = str.charAt(0); // H
// endsWith
var res = str.charAt(str.length - 1); // D
charCodeAt(index)
/* Returns an integer representing the Unicode encoding
of the character at the specified location */
var str = new String('Sample');
str.charCodeAt(3)); // 112
fromCharCode([code1[, code2[, ...[, codeN]]]])
/* Returns a string from a number of Unicode character values */
var e = window.event;
var str = String.fromCharCode(e.keyCode); // keydown etc.
concat([item1[, item2[, . . . [, itemN]]]])
/* Returns a new array consisting of a combination of two or more arrays */
var arr1 = new Array("Hello, ", "Dolly uranove");
var arr2 = new Array("World!", "dort");
var myConcatArray = arr1.concat(arr2);
alert(myConcatArray[3]); // dort
concat([string2[, string3[, . . . [, stringN]]]])
/* Returns a string value containing the concatenation
of two or more supplied strings */
var string1 = new String("Hello, ");
var string2 = new String("World!");
var myConcatString = string1.concat(string2); // Hello, World!
indexOf(subString[, startIndex])
/* Returns the character position where the first occurrence
of a substring occurs within a String object */
lastIndexOf(substring[, startindex])
/* Returns the last occurrence of a substring within a String object */
localeCompare(stringExp)
/* Returns a value indicating whether two strings
are equivalent in the current locale */
var str1 = "1";
var str2 = "2";
var n = str1.localeCompare(str2); // -1
var str1 = "2";
var str2 = "2";
var n = str1.localeCompare(str2); // 0
var str1 = "a";
var str2 = "b";
var n = str1.localeCompare(str2); // -1
var str1 = "b";
var str2 = "a";
var n = str1.localeCompare(str2); // 1
match(rgExp)
/* Executes a search on a string using a regular expression
pattern, and returns an array containing the results of that search */
var rgExp = /some text/g;
replace(rgExp, replaceText)
/* Returns a copy of a string with text replaced
using a regular expression or search string */
search(rgExp)
/* Returns the position of the first substring
match in a regular expression search */
n // A newline character
. // Any character except a newline
r // A carriage return character
t // A tab character
b // A word boundary (the start or end of a word)
B // Anything but a word boundary
d // Any digit (same as [0-9])
D // Anything but a digit (same as [^0-9])
s // Single whitespace (space, tab, newline, etc.)
S // Single nonwhitespace
w // A "word character” (same as [A-Za-z0-9_])
W // A "nonword character” (same as [^A-Za-z0-9_])
slice(start, [end])
/* Returns a section of an array or string */
var myString = new String("This is a test");
var mySlice = myString.slice(2,6); // is i // pos: 2 to 5 // 0==T, 1==h, 2==i, 3==s, 4==" ", 5==i
mySlice = myString.slice(-3); // est // end of string
mySlice = myString.slice(0); // This is a test
split([separator[, limit]])
/* Returns the array of strings that results
when a string is separated into substrings */
var str = "one two three";
var words = str.split(" ");
var len = words.length; // 3
substring(start, end)
/* Returns the substring at the specified location
within a String object */
var inpTxt = "Hello there";
alert(inpTxt.substring(6, 10)); // ther
substr(start [, length ])
// Returns a substring beginning at a specified
// location and having a specified length
var s = "The love in Spain.";
ss = s.substr(12, 5); // Spain
tolocaleLowerCase()
/* Returns a string where all alphabetic characters
have been converted to lowercase, taking into account
the host environment's current locale */
toUpperCase()
/* Returns a string where all alphabetic characters
have been converted to uppercase */
var myString = "My text";
myString.anchor //places an HTML anchor with a NAME attribute around specified text in the object
myString.big
myString.blink
myString.bold
myString.concat
myString.fixed
myString.fontcolor
myString.fontsize
myString.charAt
myString.charCodeAt
myString.indexOf
myString.italics
myString.lastindexOf
myString.length
myString.link
myString.match
myString.replace
myString.search
myString.slice
myString.small
myString.split
myString.strike
myString.sub //places HTML SUB tags around text in a String object
myString.substr
myString.substring
myString.sup
myString.toLowerCase
myString.toString
myString.toUpperCase
myString.valueOf
var str = "58";
var res = str.valueOf();
var type = (typeof res); // string
var str = 58;
var res = str.valueOf();
var type = (typeof res); // number
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HTTP to HTTPS
# only one RewriteEngine On can be used in htaccess!!!!!!!!!!!!!!
RewriteEngine On
# all redirection HTTP -> HTTPS
# HTTPS off / if start with http.....
# off equality !=on
RewriteCond %{HTTPS} off
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]
example.com to www.example.com
# redirection no www -> https://www.
RewriteCond %{HTTP_HOST} !^www. [NC]
RewriteRule ^(.*)$ https://www.%{HTTP_HOST}/$1 [R=301,L]
# //domain.com/sitemap.txt open sitemap.php
# in sitemap.php is function what return list of address
RewriteRule ^sitemap\.txt$ sitemap.php [L]
RewriteRule ^sitemap$ sitemap.php [L]
Remove www. before subdomain name
www.subdomain.example.comto
subdomain.example.com
RewriteCond %{HTTP_HOST} (^|\.)(www\.)([^\.]*)\.example\.com$ [NC]
RewriteRule (.*) https://%3.example.com/$1 [R=301,QSA,L]
Remove dust before subdomain.example.com
# www.bla.www.m.bla.subdomain.example.com to subdomain.example.com
RewriteCond %{HTTP_HOST} (.*)(subdomain.example.com$) [NC]
RewriteRule (.*) https://subdomain.example.com/$1 [R=301,QSA,L]
Remove only one www. before domain name
# redirection www. -> https://
RewriteCond %{HTTP_HOST} ^www.(.*)$ [NC]
RewriteRule ^(.*)$ https://%1/$1 [R=301,L]
Funkce JavaScript pro práci s datumem a časem.
function msToTime(duration) {
var milliseconds = parseInt((duration % 1000) / 100),
seconds = Math.floor((duration / 1000) % 60),
minutes = Math.floor((duration / (1000 * 60)) % 60),
hours = Math.floor((duration / (1000 * 60 * 60)) % 24);
hours = (hours < 10) ? "0" + hours : hours;
minutes = (minutes < 10) ? "0" + minutes : minutes;
seconds = (seconds < 10) ? "0" + seconds : seconds;
return hours + ":" + minutes + ":" + seconds + "." + milliseconds;
}
// console.log(msToTime(300000))
// output: 00:05:00.0
// get time difference between two dates in seconds
var startDate = new Date();
// Do your operations
var endDate = new Date();
var seconds = (endDate.getTime() - startDate.getTime()) / 1000;
var milliseconds = (endDate.getTime() - startDate.getTime());
[, OPTIONAL second param [, OPTIONAL ... param]]
static Date.now() // returns the number of milliseconds elapsed since January 1, 1970 00:00:00 UTC.
parse(dateVal) // Date.parse('05 Dec 1998 00:12:00 GMT'); // return 912816720000
toDateString() // sunday 19.7.2020
toTimeString() // 20:15:37
getDate() // 1-31
getDay() // 0-6, 0 == Sunday
var now = new Date();
var dayOfWeekSundayIs7 = now.getDay() == 0)?7:now.getDay();
getFullYear() // 2020
getHours() // 0-23
getMilliseconds() // eg. 956
getMinutes() // 0-59
getMonth() // 0 january
getSeconds() // 0-59
getTime() // https://en.wikipedia.org/wiki/Unix_time
getTimezoneOffset() //returns the time zone difference, in minutes, from current locale
getYear() //does not return full years ("year 2000 problem"), it is no longer used and has been replaced by the getFullYear() method.
setDate(numDate) // 1-31 day of month
setHours(numHours[, numMin[, numSec[, numMilli]]]) // now.setHours(20, 21, 22); 20:21:22
setMilliseconds(numMilli) // 0-999
setMinutes(numMinutes[, numSeconds[, numMilli]]) // 0-59, 0-59, 0-999
setMonth(numMonth[, dateVal]) // 0-11
setSeconds(numSeconds[, numMilli]) 0-59 [, 0-999]
setYear(numYear) // not set full years ("year 2000 problem"), it is no longer used and has been replaced by the setFullYear() method.
setUTCDate() //
setUTCFullYear(2020) // 2020 sets the full year for a specified date according to universal time GMT
setUTCHours()
setUTCMilliseconds()
setUTCMinutes()
setUTCMonth()
setUTCSeconds()
toLocaleTimeString()
var options = { weekday: 'long', year: 'numeric', month: 'long', day: 'numeric' };
now.toLocaleDateString(undefined, options); //neděle 19. července 2020
// PDT Pacific Daylight Time (UTC -7)
// GMT ... SET GMT TIME +- ZONE ... new Date('December 31, 1974 23:59:30 GMT-3:00');
toGMTString() // DEPRECATED!!!! use toUTCString()
// Using UTC instead GMT!!!
var d = new Date("2020-07-15T00:00:00.000+07:00"); // UTC + 7
console.log(d.toISOString()); // "2020-07-14T17:00:00.000Z"
console.log(d.valueOf()); // 1594746000000
toISOString() // "2020-07-14T17:00:00.000Z"
toJSON() // "2020-07-14T17:00:00.000Z"
toSource() //This feature is obsolete!!!! Dont use!!!!
toString() // "Tue Jul 14 2020 19:00:00 GMT+0200 (Středoevropský letní čas)"
toUTCString() // "Tue, 14 Jul 2020 17:00:00 GMT"
valueOf() // 1594746000000
Některé funkce pracující s polem v JavaScriptu
var myArray = []; // smazat obsah, nebo inicializovat nove pole
concat([item1[, item2[, . . . [, itemN]]]])
concat([string2[, string3[, . . . [, stringN]]]])
/* spoji stringy nebo pole a vraci novy string nebo pole */
join(separator)
/* vrati v string spojene itemy poli oddelene separatorem*/
push([item1 [item2 [. . . [itemN ]]]])
/* prida na konec pole novy item a vraci delku pole*/
pop()
/* odebere posledni element z pole a vrati jeho hodnotu*/
reverse()
/*vraci obracene poradi itemu pole*/
shift()
/* odebere prvni item z pole a vrati jej*/
slice(start, [end])
/* varaci cast pole*/
var numArray = new Array(3,2,5,9);
var newNumArray = numArray.slice(1,3); // 2,5
sort() // string
sort(sortFunction)
/* setridi pole cisel od nejvetsiho - descending */
sort(function(a, b){return b-a})
/* setridi od nejmensiho cisla - ascendant*/
sort(function(a, b){return a-b})
splice(start, deleteCount, [item1[, item2[, . . . [,itemN]]]])
/* odebere element z pole, popripade vlozi novy a vrati odebrany element*/
var numArray = new Array(3,2,5,9);
var newNumArray = numArray.splice(1,1); // 3,5,9
unshift([item1[, item2 [, . . . [, itemN]]]])
/* prida na pocatek item, ktery je parametrem funkce */
var myA = new Array(10,11,12);
myA.unshift(1); // 1,10,11,12
htaccess rady a zkušenosti
Testování kódu htaccess ZDEPříklady na jakpsatweb
Dokumentace na apache.org
Testování regexů
Komentar nesmi byt na stejnem radku, jako kod. Zde jsou komentare, na konci radku (vedle) prikazu, jen kvuli snadnejsimu pochopeni kodu.
RewriteCond string (regex1) # tento radek nebude fungovat, koment musi byt na samostatnem radku, nejlepe nad provadenym kodem.
# tak je to spravne, komentar na samostatnem radku a nejlepe nad ukolem
RewriteCond string (regex1)
RewriteRule dosáhne jen na regex předchozího RewriteCond!
RewriteCond string (regex1) # nedosahne
RewriteCond string (regex2)
RewriteRule (regex) %1 # v %1 bude regex2
Číslo za % udává, kolikátá skupina předchozího regexu v RewriteCond bude použita. %0 vezme vše ze všech skupin.
Pokud skupina neexistuje, tak se vypíše jako %N , kde N je číslo skupiny, která nebyla nalezena.
$1 číslo za $ udává kolikátá skupina regexu bude použita, ale platí jen pro RewriteRule z jeho vlastního regexu. $0 vezme všchny skupiny (group) regexu z RewriteRule.
RewriteCond může být několikrát za sebou, ale jakmile se jedna z těchto podmínek nesplní, tak se nesplní ani následující RewriteRule!
RewriteCond # podmínka nesplněna
RewriteCond # splněna
RewriteRule # se nevykoná, protože jedna z podmínek nebyla splněna
RewriteRule přísluší vždy k předchozímu - předchozí skupině RewriteCond. Následující RewriteRule už je samostatné viz příklad:
RewriteCond
RewriteRule # tohle reaguje na předchozí podmínku a vykoná se, když je podmínka splněna
RewriteRule # tohle už je samostatné a nebude brát ohled na podmínku - podmínky v předchozích řádcích.
Date: 27.02.2020 - 11:11
Nejdůležitější informace, které získáme z cesty souboru.
// soubor, který je volán jako první
print $_SERVER ['SCRIPT_FILENAME']; // /www/domain/subdomain/cesky-jazyk/gramatika/index.php
$path_parts = pathinfo($_SERVER ['SCRIPT_FILENAME']);
echo $path_parts['dirname']. " dir"; // /www/domain/subdomain/cesky-jazyk/gramatika
echo $path_parts['basename']. " base"; // index.php
echo $path_parts['extension']. " ext"; // php
echo $path_parts['filename']. " file"; // index az od PHP 5.2.0
// cesta k souboru, ve kterém je aktualni print a byl inkludován - include v index.php
print __FILE__; // /www/subdomains/cesk-jazyk/templates/header.php
Editace: 8.2.2021 - 22:24
Počet článků v kategorii: 77
Url:javascript-string-functions
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