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node-red/nodes/core/parsers/70-HTML.js

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/**
* Copyright JS Foundation and other contributors, http://js.foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
**/
module.exports = function(RED) {
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"use strict";
var cheerio = require('cheerio');
function CheerioNode(n) {
RED.nodes.createNode(this,n);
this.tag = n.tag;
this.ret = n.ret || "html";
this.as = n.as || "single";
var node = this;
this.on("input", function(msg) {
if (msg.hasOwnProperty("payload")) {
var tag = node.tag;
if (msg.hasOwnProperty("select")) { tag = node.tag || msg.select; }
try {
var $ = cheerio.load(msg.payload);
var pay = [];
var count = 0;
$(tag).each(function() {
count++;
});
var index = 0;
$(tag).each(function() {
if (node.as === "multi") {
var pay2 = null;
if (node.ret === "html") { pay2 = cheerio.load($(this).html().trim()).xml(); }
if (node.ret === "text") { pay2 = $(this).text(); }
if (node.ret === "attr") { pay2 = this.attribs; }
//if (node.ret === "val") { pay2 = $(this).val(); }
/* istanbul ignore else */
if (pay2) {
var new_msg = RED.util.cloneMessage(msg);
new_msg.payload = pay2;
new_msg.parts = {
id: msg._msgid,
index: index,
count: count,
type: "string",
ch: ""
};
node.send(new_msg);
}
}
if (node.as === "single") {
if (node.ret === "html") { pay.push( cheerio.load($(this).html().trim()).xml() ); }
if (node.ret === "text") { pay.push( $(this).text() ); }
if (node.ret === "attr") { pay.push( this.attribs ); }
//if (node.ret === "val") { pay.push( $(this).val() ); }
}
index++;
});
if (node.as === "single") { // Always return an array - even if blank
msg.payload = pay;
node.send(msg);
}
}
catch (error) {
node.error(error.message,msg);
}
}
else { node.send(msg); } // If no payload - just pass it on.
});
}
RED.nodes.registerType("html",CheerioNode);
}