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Note, if you're using @xmpp/client or @xmpp/component, you don't need to install @xmpp/xml.
npm install @xmpp/xml
import xml from "@xmpp/xml";
import { xml } from "@xmpp/client";
import { xml } from "@xmpp/component";
There's 2 methods for writing XML with xmpp.js
import xml from "@xmpp/xml";
const recipient = "user@example.com";
const days = ["Monday", "Tuesday", "Wednesday"];
const message = xml(
"message",
{ to: recipient },
xml("body", {}, 1 + 2),
xml(
"days",
{},
days.map((day, idx) => xml("day", { idx }, day)),
),
);
If the second argument passed to xml is a string instead of an object, it will be set as the xmlns attribute.
// both are equivalent
xml("time", "urn:xmpp:time");
xml("time", { xmlns: "urn:xmpp:time" });
/** @jsx xml */
import xml from "@xmpp/xml";
const recipient = "user@example.com";
const days = ["Monday", "Tuesday"];
const message = (
<message to={recipient}>
<body>{1 + 2}</body>
<days>
{days.map((day, idx) => (
<day idx={idx}>${day}</day>
))}
</days>
</message>
);
Requires a preprocessor such as TypeScript or Babel with @babel/plugin-transform-react-jsx.
The attrs property is an object that holds xml attributes of the element.
message.attrs.to; // user@example.com
Returns the text value of an element
message.getChild("body").text(); // '3'
Get child element by name.
message.getChild("body").toString(); // '<body>3</body>'
Get child element text value.
message.getChildText("body"); // '3'
Get children elements by name.
message.getChild("days").getChildren("day"); // [...]
Since getChildren returns an array, you can use JavaScript array methods such as filter and find to build more complex queries.
const days = message.getChild("days").getChildren("day");
// Find Monday element
days.find((day) => day.text() === "Monday");
days.find((day) => day.attrs.idx === 0);
// Find all days after Tuesday
days.filter((day) => day.attrs.idx > 2);
You can get the parent node using the parent property.
console.log(message.getChild("days").parent === message);
You can get the root node using the root method.
console.log(message.getChild("days").root() === message);
The attrs property is an object that holds xml attributes of the element.
message.attrs.type = "chat";
Set the text value of an element
message.getChild("body").text("Hello world");
Adds text or element nodes to the last position. Returns the parent.
message.append(xml("foo"));
message.append("bar");
message.append(days.map((day) => xml("day", {}, day)));
// <message>
// ...
// <foo/>
// bar
// <day>Monday</day>
// <day>Tuesday</day>
// </message>
Adds text or element nodes to the first position. Returns the parent.
message.prepend(xml("foo"));
message.prepend("bar");
message.prepend(days.map((day) => xml("day", {}, day)));
// <message>
// <day>Tuesday</day>
// <day>Monday</day>
// bar
// <foo/>
// ...
// </message>
Removes a child element.
const body = message.getChild("body");
message.remove(body);
You can embed JSON anywhere but it is recommended to use appropriate semantic.
/** @jsx xml */
// write
message.append(
<myevent xmlns="xmpp:example.org">
<json xmlns="urn:xmpp:json:0">{JSON.stringify(days)}</json>
</myevent>,
);
// read
JSON.parse(
message
.getChild("myevent", "xmpp:example.org")
.getChildText("json", "urn:xmpp:json:0"),
);
See also JSON Containers and Simple JSON Messaging.
@xmpp/xml include a function to parse XML strings.
⚠ Use with care. Untrusted input or substitutions can result in invalid XML and side effects.
import { escapeXML, escapeXMLText } from "@xmpp/xml";
import parse from "@xmpp/xml/lib/parse.js";
const ctx = parse("<message><body>hello world</body></message>");
ctx.getChildText("body"); // hello world
If you must use with untrusted input, escape it with escapeXML and escapeXMLText.
const message = parse(`
<message to="${escapeXML(to)}">
<body>${escapeXMLText(body)}</body>
</message>,
`);
FAQs
XMPP XML for JavaScript
The npm package @xmpp/xml receives a total of 15,948 weekly downloads. As such, @xmpp/xml popularity was classified as popular.
We found that @xmpp/xml demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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