JavaScript Ajax Funktionen: Unterschied zwischen den Versionen
Aus ITwiki
| Zeile 2: | Zeile 2: | ||
<source lang="Javascript"> | <source lang="Javascript"> | ||
| − | function XmlHttpObject() { | + | function XmlHttpObject() |
| + | { | ||
var xmlhttp=false; | var xmlhttp=false; | ||
/*@cc_on @*/ | /*@cc_on @*/ | ||
| Zeile 8: | Zeile 9: | ||
// JScript gives us Conditional compilation, we can cope with old IE versions. | // JScript gives us Conditional compilation, we can cope with old IE versions. | ||
// and security blocked creation of the objects. | // and security blocked creation of the objects. | ||
| − | try { | + | try |
| + | { | ||
xmlhttp = new ActiveXObject("Msxml2.XMLHTTP"); | xmlhttp = new ActiveXObject("Msxml2.XMLHTTP"); | ||
| + | } | ||
| + | catch(e) | ||
| + | { | ||
| + | try | ||
| + | { | ||
| + | xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); | ||
} | } | ||
| − | |||
| − | |||
| − | |||
| − | |||
catch(E){xmlhttp = false;} | catch(E){xmlhttp = false;} | ||
| − | + | } | |
@end @*/ | @end @*/ | ||
if(!xmlhttp && typeof XMLHttpRequest != 'undefined') | if(!xmlhttp && typeof XMLHttpRequest != 'undefined') | ||
{xmlhttp = new XMLHttpRequest();} | {xmlhttp = new XMLHttpRequest();} | ||
return xmlhttp; | return xmlhttp; | ||
| − | + | } | |
| − | function EncodeUmlaute(string) { | + | function EncodeUmlaute(string) |
| + | { | ||
var a = new Array("ä", "%E4", "ö", "%F6", "ü", "%FC", "Ä", "%C4", "Ö", "%D6", "Ü", "%DC", "ß", "%DF"); | var a = new Array("ä", "%E4", "ö", "%F6", "ü", "%FC", "Ä", "%C4", "Ö", "%D6", "Ü", "%DC", "ß", "%DF"); | ||
| − | for(var i=0; i<a.length; i+=2) { | + | for(var i=0; i<a.length; i+=2) |
| − | while(string.indexOf(a[i])>-1) { | + | { |
| + | while(string.indexOf(a[i])>-1) | ||
| + | { | ||
var p = string.indexOf(a[i]); | var p = string.indexOf(a[i]); | ||
string = string.substr(0, p) + a[i+1] + string.substr(p+1, string.length); | string = string.substr(0, p) + a[i+1] + string.substr(p+1, string.length); | ||
| − | |||
} | } | ||
| + | } | ||
return string; | return string; | ||
| − | + | } | |
| − | function SendForm(callback, action) { | + | function SendForm(callback, action) |
| + | { | ||
var xml="", a = SendForm.arguments; | var xml="", a = SendForm.arguments; | ||
| Zeile 54: | Zeile 62: | ||
xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); | xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); | ||
xmlhttp.send(xml.substring(0, xml.length-1)); | xmlhttp.send(xml.substring(0, xml.length-1)); | ||
| − | + | } | |
</source> | </source> | ||
Version vom 6. März 2008, 23:57 Uhr
Mit der Funktion SendForm() können URLs im Hintergrund abgerufen und deren Ausgabe über eine definierte Funktion verarbeitet werden.
function XmlHttpObject()
{
var xmlhttp=false;
/*@cc_on @*/
/*@if (@_jscript_version >= 5)
// JScript gives us Conditional compilation, we can cope with old IE versions.
// and security blocked creation of the objects.
try
{
xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
}
catch(e)
{
try
{
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
catch(E){xmlhttp = false;}
}
@end @*/
if(!xmlhttp && typeof XMLHttpRequest != 'undefined')
{xmlhttp = new XMLHttpRequest();}
return xmlhttp;
}
function EncodeUmlaute(string)
{
var a = new Array("ä", "%E4", "ö", "%F6", "ü", "%FC", "Ä", "%C4", "Ö", "%D6", "Ü", "%DC", "ß", "%DF");
for(var i=0; i<a.length; i+=2)
{
while(string.indexOf(a[i])>-1)
{
var p = string.indexOf(a[i]);
string = string.substr(0, p) + a[i+1] + string.substr(p+1, string.length);
}
}
return string;
}
function SendForm(callback, action)
{
var xml="", a = SendForm.arguments;
for(var i=2; i<a.length; i+=2)
xml = xml + a[i] +"="+ escape(a[i+1]) +"&";
var xmlhttp = XmlHttpObject();
xmlhttp.open("POST", action, true);
xmlhttp.onreadystatechange = function()
{
if(xmlhttp.readyState==4 && xmlhttp.status==200 && callback!=null) {
callback(xmlhttp.responseText);
xmlhttp = null;
}
}
xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
xmlhttp.send(xml.substring(0, xml.length-1));
}Aufbau der Funktion SendForm()
- Der erste Parameter definiert die Funktion, die den Rückgabewert verarbeitet.
- Der zweite Parameter die URL, die abgerufen werden soll.
- Alle weiteren Parameter bestimmen die anzuhängenden Post Variablen für die URL. Dabei wird erst der Name der Variable und dann der Wert angegeben. Die kann beliebig für mehrere Variablen wiederholt werden.
Hier ein Beispiel für die Verwendung
SendForm(Ajax_callback, "userlist.php", "id", "10", "sort", "asc");
function Ajax_callback(res)
{
alert(res);
}