1

它应该工作的方式是

  1. 将 json 粘贴到文本区域“jsonvalue”中
  2. 点击“转换”
  3. 格式化的 html 出现在“占位符”中

我试图从 json 中获取标题和 url，而不是当我点击“转换”按钮时，我得到 - Uncaught TypeError: Cannot read property 'length' of undefined

链接到jsFiddle

这是html和js

<!DOCTYPE html>
<html>
<head>


<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<meta http-equiv="Content-Language" content="he" />    <title>JSON Sample</title>
</head>

<body>

<textarea id="jsonvalue" style="width:100%" rows="1"></textarea>
<button id="convert">Click here to convert!</button>
<div id="placeholder"></div>



    <script src="http://code.jquery.com/jquery-1.9.1.min.js"></script>
    <script>

$(document).ready(function () {
    $("#convert").click(function () {

        var output = '<!DOCTYPE html><html><head><meta http-equiv="Content-Type" content="text/html; 

charset=UTF-8" /><title>Instapaper: Export</title></head><body><h1>Unread</h1><ol></ol><h1>Archive</h1><ol>';

        var data = $('#jsonvalue').val();



        $.each(data.items, function (i, items) {
            output += '<li><a href="' + items.alternate[0].href + '">' + items.title + '</li>';
        });

        output += '</ol></body></html>';
        $('#placeholder').text(output);
    });

});

    </script>
</body>
</html>

这是我在 textarea 中粘贴的 json

{
  "id" : "user/17115776656148603551/state/com.google/starred",
  "title" : "Dasa סימן פריטים בכוכב ב-Google Reader",
  "author" : "Dasa",
  "updated" : 1368699933,
  "direction" : "ltr",
  "items" : [ {
    "crawlTimeMsec" : "1368699933957",
    "timestampUsec" : "1368699933957939",
    "id" : "tag:google.com,2005:reader/item/eb307953496c3755",
    "categories" : [ "user/17115776656148603551/state/com.google/starred", "user/17115776656148603551/state/com.google/fresh", "search", "job search", "news stories", "trending", "job hunting", "news", "vanity searches", "productivity", "search query", "google alerts", "alerts", "organization", "local news", "google", "time savers", "trending news", "shortcuts", "notifications" ],
    "title" : "Five Creative Uses for Google Alerts",
    "published" : 1366282800,
    "updated" : 1366282800,
    "canonical" : [ {
      "href" : "http://lifehacker.com/five-creative-uses-for-google-alerts-475278626"
    } ],
    "alternate" : [ {
      "href" : "http://feeds.gawker.com/~r/lifehacker/full/~3/jaLbxODg6SM/five-creative-uses-for-google-alerts-475278626",
      "type" : "text/html"
    } ],
    "summary" : {
      "direction" : "ltr",
      "content" : "<p><img height=\"360\" width=\"640\" src=\"http://img.gawkerassets.com/img/18kye9icys64djpg/ku-xlarge.jpg\"></p><p>Google Alerts is one of Google's hidden gems. It's a really powerful tool to keep track of trends, interesting topics, or anything really new that appears on the web. If you're not using it already, here are a few creative ways to get started with it.</p><p><a href=\"http://lifehacker.com/five-creative-uses-for-google-alerts-475278626\">Read more...</a></p><img width=\"1\" height=\"1\" src=\"http://lifehacker.feedsportal.com/c/34977/f/647165/s/2add7ec3/mf.gif\" border=\"0\"><div><table border=\"0\"><tr><td valign=\"middle\"><a href=\"http://share.feedsportal.com/share/twitter/?u=http%3A%2F%2Flifehacker.com%2Ffive-creative-uses-for-google-alerts-475278626&amp;t=Five+Creative+Uses+for+Google+Alerts\"><img src=\"http://res3.feedsportal.com/social/twitter.png\" border=\"0\"></a> <a href=\"http://share.feedsportal.com/share/facebook/?u=http%3A%2F%2Flifehacker.com%2Ffive-creative-uses-for-google-alerts-475278626&amp;t=Five+Creative+Uses+for+Google+Alerts\"><img src=\"http://res3.feedsportal.com/social/facebook.png\" border=\"0\"></a> <a href=\"http://share.feedsportal.com/share/linkedin/?u=http%3A%2F%2Flifehacker.com%2Ffive-creative-uses-for-google-alerts-475278626&amp;t=Five+Creative+Uses+for+Google+Alerts\"><img src=\"http://res3.feedsportal.com/social/linkedin.png\" border=\"0\"></a> <a href=\"http://share.feedsportal.com/share/gplus/?u=http%3A%2F%2Flifehacker.com%2Ffive-creative-uses-for-google-alerts-475278626&amp;t=Five+Creative+Uses+for+Google+Alerts\"><img src=\"http://res3.feedsportal.com/social/googleplus.png\" border=\"0\"></a> <a href=\"http://share.feedsportal.com/share/email/?u=http%3A%2F%2Flifehacker.com%2Ffive-creative-uses-for-google-alerts-475278626&amp;t=Five+Creative+Uses+for+Google+Alerts\"><img src=\"http://res3.feedsportal.com/social/email.png\" border=\"0\"></a></td></tr></table></div><br><br><a href=\"http://da.feedsportal.com/r/163644809562/u/49/f/647165/c/34977/s/2add7ec3/kg/342/a2.htm\"><img src=\"http://da.feedsportal.com/r/163644809562/u/49/f/647165/c/34977/s/2add7ec3/kg/342/a2.img\" border=\"0\"></a><img width=\"1\" height=\"1\" src=\"http://pi.feedsportal.com/r/163644809562/u/49/f/647165/c/34977/s/2add7ec3/kg/342/a2t.img\" border=\"0\"><img src=\"http://feeds.feedburner.com/~r/lifehacker/full/~4/jaLbxODg6SM\" height=\"1\" width=\"1\">"
    },
    "author" : "Alan Henry",
    "comments" : [ ],
    "annotations" : [ ],
    "origin" : {
      "streamId" : "feed/http://lifehacker.com/index.xml",
      "title" : "Lifehacker",
      "htmlUrl" : "http://lifehacker.com"
    }
  }, {
    "crawlTimeMsec" : "1368699816215",
    "timestampUsec" : "1368699816215241",
    "id" : "tag:google.com,2005:reader/item/84c25c636b707078",
    "categories" : [ "user/17115776656148603551/state/com.google/read", "user/17115776656148603551/state/com.google/starred", "user/17115776656148603551/state/com.google/fresh", "Breakfast", "Gluten-Free", "Photo", "Pudding" ],
    "title" : "yogurt panna cotta with walnuts and honey",
    "published" : 1366988860,
    "updated" : 1366988860,
    "canonical" : [ {
      "href" : "http://smittenkitchen.com/blog/2013/04/yogurt-panna-cotta-with-walnuts-and-honey/"
    } ],
    "alternate" : [ {
      "href" : "http://feedproxy.google.com/~r/smittenkitchen/~3/t_w8asbkyNg/",
      "type" : "text/html"
    } ],
    "content" : {
      "direction" : "ltr",
      "content" : "<p><a href=\"http://smittenkitchen.com/blog/2013/04/yogurt-panna-cotta-with-walnuts-and-honey/\" title=\"yogurt panna cotta with walnuts and honey\"><img src=\"http://farm9.staticflickr.com/8400/8682467912_efaa762c89.jpg\" width=\"500\" height=\"333\" alt=\"yogurt panna cotta with walnuts and honey\"></a></p>\nGuys, I just discovered the ultimate weekend brunch treat/decadent dessert that still contains a whiff of moderation/<a href=\"http://www.flickr.com/photos/smitten/8681658077/in/photostream\">preschooler</a> snack. The ingredient list is so short, and the cooking process is so simple that you’ll have the recipe memorized by the time you make it the second time. And you will make it a second time, maybe even within a week. It looks pretty, tastes luxurious and… well, most of you probably discovered panna cotta a decade ago.\n<p><a href=\"http://www.flickr.com/photos/smitten/8682466230/\" title=\"lemon, gelatin, sugar, milk/cream, yogurt\"><img src=\"http://farm9.staticflickr.com/8395/8682466230_9e19d63848.jpg\" width=\"500\" height=\"333\" alt=\"lemon, gelatin, sugar, milk/cream, yogurt\"></a><br>\n<a href=\"http://www.flickr.com/photos/smitten/8682466352/\" title=\"thick greek yogurt\"><img src=\"http://farm9.staticflickr.com/8262/8682466352_5a3120eb08.jpg\" width=\"500\" height=\"333\" alt=\"thick greek yogurt\"></a></p>\n<p>I’m sorry, I’m just slow. For example, this week I started reading <a href=\"http://rads.stackoverflow.com/amzn/click/1594483299">this new book</a> that everyone was talking about in September … 2007. And that’s just the beginning. Gallery wall? Skinny jeans? Arrested Development? Quinoa? People, I am <i>on it</i>. True to sluggish form, it’s been a full four years since my friend Nicole gushed to me about the wonders of yogurt panna cotta. I put it on my cooking to-do list, blinked, and that about brings us up to last week when I saw it on my list and thought, “right, wasn’t I going to make that a few days ago?”&lt;/p>\n<p><a href=\"http://www.flickr.com/photos/smitten/8681355169/\" title=\"yogurt whisked with milk or cream\"><img src=\"http://farm9.staticflickr.com/8522/8681355169_9657d4a377.jpg\" width=\"500\" height=\"333\" alt=\"yogurt whisked with milk or cream\"></a></p>\n<p><b>... Read the rest of <a href=\"http://smittenkitchen.com/blog/2013/04/yogurt-panna-cotta-with-walnuts-and-honey/\">yogurt panna cotta with walnuts and honey</a> on <a href=\"http://smittenkitchen.com\">smittenkitchen.com</a></b></p>\n<hr>\n<p><small>© smitten kitchen 2006-2012. |\n<a href=\"http://smittenkitchen.com/blog/2013/04/yogurt-panna-cotta-with-walnuts-and-honey/\">permalink to <b>yogurt panna cotta with walnuts and honey</b></a> | <a href=\"http://smittenkitchen.com/blog/2013/04/yogurt-panna-cotta-with-walnuts-and-honey/#comments\">220 comments</a> to date | see more: <a href=\"http://smittenkitchen.com/blog/category/breakfast/\" title=\"View all posts in Breakfast\" rel=\"category tag\">Breakfast</a>, <a href=\"http://smittenkitchen.com/blog/category/gluten-free/\" title=\"View all posts in Gluten-Free\" rel=\"category tag\">Gluten-Free</a>, <a href=\"http://smittenkitchen.com/blog/category/photo/\" title=\"View all posts in Photo\" rel=\"category tag\">Photo</a>, <a href=\"http://smittenkitchen.com/blog/category/pudding/\" title=\"View all posts in Pudding\" rel=\"category tag\">Pudding</a>\n</small></p>"
    },
    "author" : "deb",
    "comments" : [ ],
    "annotations" : [ ],
    "origin" : {
      "streamId" : "feed/http://feeds.feedburner.com/smittenkitchen",
      "title" : "smitten kitchen",
      "htmlUrl" : "http://smittenkitchen.com"
    }
  } ]
}
4

2 回答 2

2

您正在尝试迭代data.items哪个将为空，因为data它是一个没有items属性的字符串。您需要先解析 JSON 对象，使用JSON.parse.

另一个问题是现在您的 JSON 不会解析，因为它无效。您没有正确转义content.content.

之后，如果要更改标记而不插入可读代码，则需要使用.html而不是设置输出。.text

如果您修复 JSON，这个修改后的小提琴将起作用。您缺少以href文本“this new book”结尾的链接属性的引号的转义字符。

于 2013-05-21T06:04:15.773 回答
0

尝试这样的事情

    $(document).ready(function () {
        $("#convert").click(function () {

            var output = '<!DOCTYPE html><html><head><meta http-equiv="Content-Type" content="text/html" charset="UTF-8" /><title>Instapaper: Export</title></head><body><h1>Unread</h1><ol></ol><h1>Archive</h1><ol>';

            var data = $('#jsonvalue').val();
            data = jQuery.parseJSON(data);

            $.each(data.items, function (i, items) {
                output += '<li><a href="' + items.alternate[0].href + '">' + items.title + '</li>';
            });

            output += '</ol></body></html>';
            $('#placeholder').text(output);
        });

    });
于 2013-05-21T06:09:16.757 回答