【问题标题】:Output from function in Node-Red showing as [object OBJECT] in html. templateNode-Red 中函数的输出在 html 中显示为 [object OBJECT]。模板
【发布时间】:2017-12-02 10:06:44
【问题描述】:

好吧,这是我的第一天......

我正在尝试制作一个小的 Node-Red 应用程序。这可能看起来很愚蠢,但它实际上是一个有趣的例子,我需要做的事情不那么幽默。 HTTP 输入触发对 Urban Dictionary API 的 HTTP 请求,并抓取术语“Honey Badger”的随机定义。

然后一个函数将字符串咀嚼成碎片,只提取实际定义并丢弃所有元垃圾。

然后将字符串传递给包含 {{payload}} 行之前和之后的 HTML 加载的模板,以生成显示来自 Urban Dictionary 的内容的页面,并在每个页面加载时显示随机定义。

我得到了我想要的一切,并且调试我的模板的输出是在日志中显示 UD 内容,但是在浏览器中我得到的只是 [object OBJECT] 我的文本段落应该在哪里。

我知道这是因为函数输出的是对象,而不是字符串。

我并没有完全理解对象是什么。

我以前从未编写过任何 JS,这就是我开始的地方。

[{"id":"65001585.8c9564","type":"http in","z":"4737d790.fefe58","name":"badger","url":"/Badger","method":"get","upload":false,"swaggerDoc":"","x":76,"y":72,"wires":[["980800c8.6789f","ab39736b.ffbfd"]]},{"id":"980800c8.6789f","type":"http request","z":"4737d790.fefe58","name":"URBAN DICTIONARY","method":"GET","ret":"txt","url":"https://urban.now.sh/random/Honey Badger","tls":"","x":269,"y":106,"wires":[["c0ff5132.822508"]]},{"id":"ab39736b.ffbfd","type":"http response","z":"4737d790.fefe58","name":"http response","x":1016.5551147460938,"y":75.22221374511719,"wires":[]},{"id":"e98c98a8.0a9a28","type":"template","z":"4737d790.fefe58","name":"Template","field":"payload","fieldType":"msg","format":"handlebars","syntax":"mustache","template":"<!DOCTYPE html>\n<HTML>\n\n\t<HEAD>\n\t\t<TITLE> [ H O N E Y B A D G E R ] </TITLE>\n\t\t<META HTTP-EQUIV=\"refresh\" CONTENT=\"300\">\n<style>\np.minortext\n{\n    font-family: \"Arimo\";\n    color:#A9A9A9\n}\np.majortext\n{\n    font-family: \"Impact\";\n    color:black\n    size:20\n}\n\n</style>\n</head>\n\n\t<BODY>\n\t        <CENTER>\n\t            <Table Width = \"100%\" Bgcolor=\"#A9A9A9\"><TR><TD ALIGN = \"CENTER\">\n\t              <a class=\"weatherwidget-io\" href=\"https://forecast7.com/en/n34d93138d60/adelaide/\" data-font=\"Roboto Slab\" data-mode=\"Current\" data-days=\"3\" data-shadow=\"#000000\" data-accent=\"#000000\" data-textColor=\"#ffffff\" data-highColor=\"#ffffff\" data-lowColor=\"#ffffff\" data-sunColor=\"#ffffff\" data-moonColor=\"#ffffff\" data-cloudColor=\"#ffffff\" data-cloudFill=\"#ffffff\" data-rainColor=\"#ffffff\" data-snowColor=\"#ffffff\" >Adelaide, South Australia, Australia</a>\n<script>\n!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=\"https://weatherwidget.io/js/widget.min.js\";fjs.parentNode.insertBefore(js,fjs);}}(document,\"script\",\"weatherwidget-io-js\");\n</script>\n</td><td align = \"center\">\n\n\n</td>\n\n\n\n</TD><TD ALIGN = \"RIGHT\"><IMG SRC=\"LogIn.PNG\">       </TD></TR></Table>\n\t        <Table Width = \"500\" Height = \"620\" Border = \"0\">\n\t            <TR Width = \"500\" Height = \"320\">\n\t                <TD Width = \"500\" Height = \"320\" VALIGN = \"CENTER\">\n\t\t<CENTER>\n\t\t\t    <FONT SIZE = \"20\">\n                    <p class=\"majortext\">\n                        <IMG SRC=\"HoneyBadger.PNG \" ALT=\"HoneyBadger\"><BR>\n\t\t\t\t        <B>H O N E Y B A D G E R</B>\n\t\t\t        </P>\n\t\t\t    </FONT>\n\t\t\t        </TD>\n\t\t\t     </TR>\n\t\t\t     \t            <TR Width = \"500\" Height = \"300\">\n\t                <TD Width = \"500\" Height = \"300\" VALIGN = \"TOP\">\n\t\t\t<CENTER>\n\t\t\n\t\t\t<p class=\"minortext\">\n\t\t\t    \t\t\t    <FONT SIZE = \"5\">\n\t\t\t    {{{payload}}}\n            </P>\n\t\t</CENTER>\n\t\t    </TD>\n\t\t    </TR>\n\t\t    </TABLE>\n\t\t</CENTER>\n\t</BODY>\n</HTML>\t\t\t    \n\n","output":"str","x":830.0000610351562,"y":108.55557250976562,"wires":[["ad7d02ac.52565","ab39736b.ffbfd"]]},{"id":"ad7d02ac.52565","type":"debug","z":"4737d790.fefe58","name":"","active":true,"console":"true","complete":"payload","x":1013.3883666992188,"y":153.77764892578125,"wires":[]},{"id":"c0ff5132.822508","type":"function","z":"4737d790.fefe58","name":"test","func":"var parts = msg.payload.split(\"definition\");\nvar message1 = { payload: parts[0] };\nvar message2 = { payload: parts[1] };\nvar msg2parts = message2.payload.split(\"URL\");\nvar msgsparts1 = {payload: msg2parts[0]};\nvar msgsparts2 = {payload: msg2parts[1]};\n\n\nreturn msgsparts1;\n","outputs":"1","noerr":0,"x":446.75921630859375,"y":106.75926971435547,"wires":[["e132da2c.78b1a8"]]},{"id":"e132da2c.78b1a8","type":"change","z":"4737d790.fefe58","name":"","rules":[{"t":"change","p":"payload","pt":"msg","from":"\"\"","fromt":"str","to":"","tot":"str"},{"t":"change","p":"payload","pt":"msg","from":"\\n","fromt":"str","to":"","tot":"str"},{"t":"change","p":"payload","pt":"msg","from":"n\\","fromt":"str","to":"","tot":"str"},{"t":"change","p":"payload","pt":"msg","from":":","fromt":"str","to":"","tot":"str"},{"t":"change","p":"payload","pt":"msg","from":"\"\"\"","fromt":"str","to":"","tot":"str"},{"t":"change","p":"payload","pt":"msg","from":".\",\"\"","fromt":"str","to":"","tot":"str"},{"t":"change","p":"payload","pt":"msg","from":"\\","fromt":"str","to":"","tot":"str"},{"t":"change","p":"payload","pt":"msg","from":"\"","fromt":"str","to":"","tot":"str"},{"t":"change","p":"payload","pt":"msg","from":"example","fromt":"str","to":"","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":628.8887939453125,"y":107.99996948242188,"wires":[["e98c98a8.0a9a28"]]}]

【问题讨论】:

    标签: javascript html object converter node-red


    【解决方案1】:

    首先,您需要删除http-inhttp-response 节点之间的直接链接,因为这不会向发出请求的浏览器返回任何内容。

    下一个问题,要使 http-in/http-response 节点正常工作,您需要将http-in 节点生成的原始消息一路向下传递到http-response 节点。您正在Test 函数节点中生成一个新消息(msgsparts1)对象,这将不起作用。

    此外,来自城市字典的响应是一个 JSON 对象,因此与其尝试使用字符串函数 .split() 将其拆分,不如解析 JSON 并访问它的字段要容易得多。为此,您可以使用 JSON node 解析字符串并使用 change node 将描述移动到 msg.payload。

    在将消息发送到http-response 之前,您还需要从http-request 中删除标头。您可以使用相同的change node 来执行此操作

    [{"id":"72cc29ed.aa819","type":"http in","z":"8aa94366.b8bde","name":"badger","url":"/Badger","method":"get","swaggerDoc":"","x":90,"y":160,"wires":[["2f9e6174.bde466"]]},{"id":"2f9e6174.bde466","type":"http request","z":"8aa94366.b8bde","name":"URBAN DICTIONARY","method":"GET","ret":"txt","url":"https://urban.now.sh/random/Honey Badger","tls":"","x":200,"y":260,"wires":[["5d7d10da.a757d"]]},{"id":"c6b86250.24357","type":"http response","z":"8aa94366.b8bde","name":"http response","x":960,"y":220,"wires":[]},{"id":"5d1bd9d2.9efad8","type":"template","z":"8aa94366.b8bde","name":"Template","field":"payload","fieldType":"msg","format":"handlebars","syntax":"mustache","template":"<!DOCTYPE html>\n<HTML>\n\n\t<HEAD>\n\t\t<TITLE> [ H O N E Y B A D G E R ] </TITLE>\n\t\t<META HTTP-EQUIV=\"refresh\" CONTENT=\"300\">\n<style>\np.minortext\n{\n    font-family: \"Arimo\";\n    color:#A9A9A9\n}\np.majortext\n{\n    font-family: \"Impact\";\n    color:black\n    size:20\n}\n\n</style>\n</head>\n\n\t<BODY>\n\t        <CENTER>\n\t            <Table Width = \"100%\" Bgcolor=\"#A9A9A9\"><TR><TD ALIGN = \"CENTER\">\n\t              <a class=\"weatherwidget-io\" href=\"https://forecast7.com/en/n34d93138d60/adelaide/\" data-font=\"Roboto Slab\" data-mode=\"Current\" data-days=\"3\" data-shadow=\"#000000\" data-accent=\"#000000\" data-textColor=\"#ffffff\" data-highColor=\"#ffffff\" data-lowColor=\"#ffffff\" data-sunColor=\"#ffffff\" data-moonColor=\"#ffffff\" data-cloudColor=\"#ffffff\" data-cloudFill=\"#ffffff\" data-rainColor=\"#ffffff\" data-snowColor=\"#ffffff\" >Adelaide, South Australia, Australia</a>\n<script>\n!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=\"https://weatherwidget.io/js/widget.min.js\";fjs.parentNode.insertBefore(js,fjs);}}(document,\"script\",\"weatherwidget-io-js\");\n</script>\n</td><td align = \"center\">\n\n\n</td>\n\n\n\n</TD><TD ALIGN = \"RIGHT\"><IMG SRC=\"LogIn.PNG\">       </TD></TR></Table>\n\t        <Table Width = \"500\" Height = \"620\" Border = \"0\">\n\t            <TR Width = \"500\" Height = \"320\">\n\t                <TD Width = \"500\" Height = \"320\" VALIGN = \"CENTER\">\n\t\t<CENTER>\n\t\t\t    <FONT SIZE = \"20\">\n                    <p class=\"majortext\">\n                        <IMG SRC=\"HoneyBadger.PNG \" ALT=\"HoneyBadger\"><BR>\n\t\t\t\t        <B>H O N E Y B A D G E R</B>\n\t\t\t        </P>\n\t\t\t    </FONT>\n\t\t\t        </TD>\n\t\t\t     </TR>\n\t\t\t     \t            <TR Width = \"500\" Height = \"300\">\n\t                <TD Width = \"500\" Height = \"300\" VALIGN = \"TOP\">\n\t\t\t<CENTER>\n\t\t\n\t\t\t<p class=\"minortext\">\n\t\t\t    \t\t\t    <FONT SIZE = \"5\">\n\t\t\t    {{{payload}}}\n            </P>\n\t\t</CENTER>\n\t\t    </TD>\n\t\t    </TR>\n\t\t    </TABLE>\n\t\t</CENTER>\n\t</BODY>\n</HTML>\t\t\t    \n\n","x":780,"y":260,"wires":[["bc66ae55.037f78","c6b86250.24357"]]},{"id":"bc66ae55.037f78","type":"debug","z":"8aa94366.b8bde","name":"","active":true,"console":"true","complete":"payload","x":940,"y":300,"wires":[]},{"id":"5d7d10da.a757d","type":"json","z":"8aa94366.b8bde","name":"","x":390,"y":260,"wires":[["8ecda72f.12eed8"]]},{"id":"8ecda72f.12eed8","type":"change","z":"8aa94366.b8bde","name":"","rules":[{"t":"move","p":"payload.definition","pt":"msg","to":"payload","tot":"msg"},{"t":"delete","p":"headers","pt":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":560,"y":260,"wires":[["e0951766.77e858","5d1bd9d2.9efad8"]]},{"id":"e0951766.77e858","type":"debug","z":"8aa94366.b8bde","name":"","active":true,"console":"false","complete":"false","x":810,"y":180,"wires":[]}]
    

    【讨论】:

    • 是的,直接链接是我在清除垃圾时犯的一个错误,因此我可以分享一些干净的东西。该链接以前进入模板节点,因为出于某种原因,将数据从我的更改规则传递到模板节点没有将模板提供给 http 响应。这是我第一次接触 Node-Red,所以我不确定我是否可以期待它的表现与我想象的一样。我真的对 JSON 一无所知,所以我坚持我将如何处理 python 中的字符串 string.split () 我会在早上用你的建议重新讨论这个问题。谢谢你的帮助:)
    • 您也应该在 python 中解析 JSON,尝试手动将其切碎绝不是一个好主意。
    • 是的,我完全是个菜鸟。因此,尽管我提取所需数据的方法不正确,但我仍然很想知道如何获取函数的输出并将其插入模板以发送 http 响应。有没有办法我可以做类似 msg.payload=str(msg.payload) 的事情?
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