W3.JS W3Data
Wat is W3Data?
W3Data is 'n instrument om bedienerdata na HTML-toepassings te bring.
Die doel van W3Data is om w3.js van data vanaf 'n webbediener te voorsien.
Toepassingsmodelle
W3Data gebruik toepassingsmodelle (geskryf in JSON) om bedienertoepassings te beskryf.
Hierdie eenvoudige model beskryf 'n volledige toepassing vir die herwinning van data vanaf 'n databasis :
model_customers.js
{
"database" : {
"connection" : "localmysql",
"sql" : "SELECT * FROM Customers"}
}
Die modelle word op die bediener gestoor en kan nie deur 'n webgebruiker geredigeer word nie.
U moet 'n bedieneradministrateur wees of 'n gebruiker wat die regte het om lêers op die bediener te wysig.
Om 'n toepassingsmodel te gebruik is maklik, voeg net die modelnaam by w3data.php wanneer jy w3Http() roep:
Voorbeeld
<script>
w3.getHttpObject("w3data.php?model=model_customers", myFunction);
function myFunction(myObject) {
w3.displayObject("id01",
myObject);
}
</script>
Vertoon vanaf 'n tekslêer
Voorbeeld
<script>
w3.getHttpObject("w3data.php?model=model_cd_from_txt", myFunction);
function myFunction(myObject) {
w3.displayObject("id01",
myObject);
}
</script>
Dit is die model wat in die toepassing gebruik word:
model_cd_from_txt
{
"data" : {
"type" : "csvfile",
"filename" : "cd_catalog.txt",
"items" : [
{"name" : "title", "index"
: 1},
{"name" : "artist", "index" :
2},
{"name" : "price", "index" : 5}
]
}
}
Dit is die kommageskeide tekslêer:
cd_catalog.txt
Empire Burlesque,Bob Dylan,USA,Columbia,10.90,1985
Hide your heart,Bonnie Tyler,UK,CBS Records,9.90,1988
Greatest Hits,Dolly Parton,USA,RCA,9.90,1982
Still got the blues,Gary Moore,UK,Virgin records,10.20,1990
Eros,Eros Ramazzotti,EU,BMG,9.90,1997
One night only,Bee Gees,UK,Polydor,10.90,1998
Sylvias Mother,Dr.Hook,UK,CBS,8.10,1973
Maggie May,Rod Stewart,UK,Pickwick,8.50,1990
Vertoon vanaf 'n JSON-lêer
Voorbeeld
<script>
w3.getHttpObject("w3data.php?model=model_cd_from_json", myFunction);
function
myFunction(myObject) {
w3.displayObject("id01", myObject);
}
</script>
Dit is die model wat in die toepassing gebruik word:
model_cd_from_json.js
{
"data" : {
"type" : "jsonfile",
"filename" : "cd_catalog.js",
"record" : "cd"
"items" : [
{"name" : "title", "nodename"
: "title"},
{"name" : "artist", "nodename" :
"artist"},
{"name" : "price", "nodename" :
"price"}
]
}
}
Dit is die JSON-lêer:
cd_catalog.js
{
"cd" : [
{ "title" : "Empire Burlesque",
"artist" : "Bob Dylan", "price" : "10.90" },
{ "title" :
"Hide your heart", "artist" : "Bonnie Tyler", "price" : "9.90" },
{ "title" : "Greatest Hits", "artist" : "Dolly Parton", "price" : "9.90" },
{ "title" : "Still got the blues", "artist" : "Gary Moore", "price" : "10.20"
},
{ "title" : "Eros", "artist" : "Eros Ramazzotti",
"price" : "9.90" },
{ "title" : "One night only",
"artist" : "Bee Gees", "price" : "10.90" },
{ "title" : "Sylvias
Mother", "artist" : "Dr.Hook", "price" : "8.10" }
]
}
Vertoon vanaf 'n XML-lêer
Voorbeeld
<script>
w3.getHttpObject("w3data.php?model=model_cd_from_xml", myFunction);
function myFunction(myObject) {
w3.displayObject("id01",
myObject);
}
</script>
Dit is die model wat in die toepassing gebruik word:
model_cd_from_xml
{
"data" : {
"type" : "xmlfile",
"filename" : "cd_catalog.xml",
"record" : "CD",
"items" : [
{"name" : "artist", "nodename"
: "ARTIST"},
{"name" : "title", "nodename"
: "TITLE"},
{"name" : "country", "nodename"
: "COUNTRY"}
]
}
}
Dit is die XML-lêer:
cd_catalog.xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<CATALOG>
<CD>
<TITLE>Empire Burlesque</TITLE>
<ARTIST>Bob Dylan</ARTIST>
<COUNTRY>USA</COUNTRY>
<COMPANY>Columbia</COMPANY>
<PRICE>10.90</PRICE>
<PUBLISHED>1985</PUBLISHED>
</CD>
<CD>
<TITLE>Hide your heart</TITLE>
<ARTIST>Bonnie Tyler</ARTIST>
<COUNTRY>UK</COUNTRY>
<COMPANY>CBS
Records</COMPANY>
<PRICE>9.90</PRICE>
<PUBLISHED>1988</PUBLISHED>
</CD>
<CD>
<TITLE>Greatest Hits</TITLE>
<ARTIST>Dolly Parton</ARTIST>
<COUNTRY>USA</COUNTRY>
<COMPANY>RCA</COMPANY>
<PRICE>9.90</PRICE>
<PUBLISHED>1982</PUBLISHED>
</CD>
<CD>
<TITLE>Still got the
blues</TITLE>
<ARTIST>Gary Moore</ARTIST>
<COUNTRY>UK</COUNTRY>
<COMPANY>Virgin records</COMPANY>
<PRICE>10.20</PRICE>
<PUBLISHED>1990</PUBLISHED>
</CD>
<CD>
<TITLE>Eros</TITLE>
<ARTIST>Eros Ramazzotti</ARTIST>
<COUNTRY>EU</COUNTRY>
<COMPANY>BMG</COMPANY>
<PRICE>9.90</PRICE>
<PUBLISHED>1997</PUBLISHED>
</CD>
<CD>
<TITLE>One night only</TITLE>
<ARTIST>Bee Gees</ARTIST>
<COUNTRY>UK</COUNTRY>
<COMPANY>Polydor</COMPANY>
<PRICE>10.90</PRICE>
<PUBLISHED>1998</PUBLISHED>
</CD>
<CD>
<TITLE>Sylvias Mother</TITLE>
<ARTIST>Dr.Hook</ARTIST>
<COUNTRY>UK</COUNTRY>
<COMPANY>CBS</COMPANY>
<PRICE>8.10</PRICE>
<PUBLISHED>1973</PUBLISHED>
</CD>
</CATALOG>
Aflaaie
Laai die lêer af: https://www.w3schools.com/w3js/w3data.php.txt .
Kopieer die lêer na jou webwerf en hernoem dit na w3data.php .