insertBefore()
XML DOM insertBefore() metodi
❮ Element obyekti
Misol
Quyidagi kod fragmenti "books.xml" faylini xmlDoc’ga yuklaydi, yangi <book> tugunini yaratadi va uni oxirgi <book> elementidan oldin joylashtiradi:
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 newNode = xmlDoc.createElement("book");
var x = xmlDoc.documentElement;
var y = xmlDoc.getElementsByTagName("book");
document.getElementById("demo").innerHTML =
"Book elements before: " + y.length + "<br>";
x.insertBefore(newNode, y[3]);
document.getElementById("demo").innerHTML +=
"Book elements after: " + y.length;
}
Yuqoridagi kodning natijasi quyidagicha bo‘ladi:
Book elements before: 4
Book elements after: 5
O‘zingiz sinab ko‘ring »
Ta’rif va qo‘llanilishi
insertBefore() metodi mavjud bola tugundan oldin yangi bola tugun joylashtiradi.
Bu metod yangi bola tugunni qaytaradi.
Sintaksis
elementNode.insertBefore(new_node,existing_node)| Parametr | Tavsif |
|---|---|
| new_node | Majburiy. Joylashtiriladigan tugun |
| existing_node | Majburiy. Mavjud tugun. Yangi tugun shu tugundan oldin joylashtiriladi. |
❮ Element obyekti
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