[英]How to use JSON data with Javascript
我是javascript的新手,因此真的不知道如何问我要问的问题。 这样做的目的是要道歉,如果这是一个重复的问题。 话虽如此,我偶然发现了该站点,并希望利用此处讨论的方法。 鉴于我对此类工具的使用案例将涉及使用Python或R动态生成JSON,我想知道如何
a)适当地生成JSON。
b)将其与<script>
标记集成在一起,使其成为Javascipt中的JSON对象。
这是我现在拥有的代码:
html <- paste('<head><link title="timeline-styles", rel="stylesheet" href="//cdn.knightlab.com/libs/timeline3/latest/css/timeline.css"><script src="//cdn.knightlab.com/libs/timeline3/latest/js/timeline.js"></script></head><body><div id="timeline-embed" style="width: 100%; height: 600px"></div><script type="text/javascript">var timeline_json=', readr::read_lines("~/projects/timelineJS/trial.json") %>% paste(collapse=''),'; window.timeline=new TL.Timeline("timeline-embed", timeline_json);</script></body>', sep='')
write(html, file="~/projects/timelineJS/test.html")
输出似乎是我想要的(下面的输出已清理):
<head>
<link title="timeline-styles" rel="stylesheet" href="//cdn.knightlab.com/libs/timeline3/latest/css/timeline.css">
<script src="//cdn.knightlab.com/libs/timeline3/latest/js/timeline.js"></script>
</head>
<body>
<div id="timeline-embed" style="width: 100%; height: 600px"></div>
<script type="text/javascript">
var timeline_json={"title": {"media": {"url": "//www.flickr.com/photos/tm_10001/2310475988/", "caption": "Whitney Houston performing on her My Love is Your Love Tour in Hamburg.", "credit": "flickr/<a href='http://www.flickr.com/photos/tm_10001/'>tm_10001</a>"}, "text": {"headline": "Whitney Houston<br/> 1963 - 2012", "text": "<p>Houston's voice caught the imagination of the world propelling her to superstardom at an early age becoming one of the most awarded performers of our time. This is a look into the amazing heights she achieved and her personal struggles with substance abuse and a tumultuous marriage.</p>"}}, "events": ["media": {"url": "https://youtu.be/fSrO91XO1Ck", "caption": "", "credit": "<a href=\"http://unidiscmusic.com\">Unidisc Music</a>"}, "start_date": {"year": "1978"}, "text": {"headline": "First Recording", "text": "At the age of 15 Houston was featured on Michael Zager's song, Life's a Party."}]};
window.timeline = new TL.Timeline("timeline-embed", timeline_json);
</script>
</body>
但是,当我加载html文件时,它只是一个空白屏幕。 我不知道自己在做什么方面做得很好,无法知道从哪里开始调试,因此朝着正确方向提供的任何帮助将不胜感激。 谢谢!
事件必须是对象数组。
普通数组将仅包含一个值,即Days = [ "mon", "tues" .... }
。
一个对象可以保存多条信息(甚至是功能)。
您需要告诉JavaScript您要使用array [],并且此数组包含多个对象{},所以最终得到[{},{},{},{}]
。
使用您之前的代码,您告诉JSON解析器期望一个数组。 解析器查找直到:的值。 由于这不是数组定界符,因此会导致解析器抛出错误
"events": [
"media": {
"url": "https://youtu.be/fSrO91XO1Ck",
"caption": "",
"credit": "<a href=\"http://unidiscmusic.com\">Unidisc Music</a>"
},
"start_date": {"year": "1978"},
"text": {
"headline": "First Recording",
"text": "At the age of 15 Houston was featured on Michael Zager's song, Life's a Party."
}
]
此代码告诉解析期望一个数组[下一个符号用于对象。 因此,解析器将期望包含一个或多个对象的数组。
"events": [{
"media": {
"url": "https://youtu.be/fSrO91XO1Ck",
"caption": "",
"credit": "<a href=\"http://unidiscmusic.com\">Unidisc Music</a>"
},
"start_date": {"year": "1978"},
"text": {
"headline": "First Recording",
"text": "At the age of 15 Houston was featured on Michael Zager's song, Life's a Party."
}
}]
解析器如果非常挑剔。 如果发现错误,它将停止处理数据。 确保查看浏览器控制台日志(F12和控制台-在Chrome中)。
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