XML DOM compareDocumentPosition() Metode
❮ Node Voorwerp
Voorbeeld
Die volgende kodefragment laai " books.xml " in xmlDoc en vergelyk die plasing van twee nodusse (die eerste en die derde <book>-element) in die DOM-hiërargie:
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
myFunction(this);
}
};
xhttp.open("GET", "books.xml", true);
xhttp.send();
function myFunction(xml) {
var xmlDoc = xml.responseXML;
var x =
xmlDoc.getElementsByTagName('book')[0];
var y =
xmlDoc.getElementsByTagName('book')[2];
document.getElementById("demo").innerHTML =
x.compareDocumentPosition(y);
}
Die afvoer van die kode hierbo sal wees:
4
Die meeste blaaiers sal leë spasies of nuwe reëls as teksnodes hanteer, IE 9 en vroeër sal nie. Dus, in die voorbeeld hierbo, sal die meeste blaaiers 4 uitvoer, terwyl IE 9 en vroeër 2 sal uitvoer.
Definisie en gebruik
Die compareDocumentPosition()-metode vergelyk die plasing van twee nodusse in die DOM-hiërargie (dokument).
Blaaierondersteuning
Die compareDocumentPosition()-metode word in alle groot blaaiers ondersteun.
Let wel: Internet Explorer 9 en vroeër ondersteun nie hierdie metode nie.
Sintaksis
nodeObject.compareDocumentPosition(node)Grense
| Parameter | Type | Description |
|---|---|---|
| node | Node object | Required. Specifies the node to compare with the current node |
Terugkeerwaarde
| Type | Description |
|---|---|
| Number | A Number representing where the two nodes are positioned compared to each other. The possible return values
are:
1 - No relationship, the two nodes do not belong to the same document. 2 - The specified node precedes the current node. 4 - The specified node follows the current node. 8 - The specified node contains the current node. 16 - The specified node is contained by the current node. 32 - The specified and the current node have no common container node or the two nodes are different attributes of the same node. Note: The return value could also be a combination of values. E.g. a return value of 20 means that the specified node is contained by the current node (16) AND the specified node follows the current node (4). |
Tegniese besonderhede
| DOM weergawe | Kernvlak 3 Node-objek |
|---|
❮ Node Voorwerp