我在这个Javascript / JSON / Handlebars事物上是全新的,我在使用两个嵌套级别获取JSON对象时无法在Handlebars模板中工作。
我已经使用JSONLint验证了JSON对象,因此它是有效的JSON代码,但我不知道我是否有正确的JSON格式来使模板正常工作。 :)(我正在另一个系统中手动构建JSON。)或许它是我错误的模板的语法。这就是我希望找到的......
简短说明:此对象是目录。我有章节,然后是每章内的电影。所以电影是每个章节元素的嵌套元素。
我希望HTML输出类似于:
Chapter1: ChapterName
Movie1: MovieName
Movie2: MovieName
Chapter2: Chaptername
Movie1: MovieName
Movie2: MovieName
Movie3: MovieName
我似乎最终只得到了一个数据实例(我的JSON对象中的最后一个元素),或者我什么都没得到。 (取决于我尝试的小调整或版本。)浏览器控制台不显示任何错误。
这是我到目前为止尝试使用的所有代码(脚本,HTML,模板等):
<!DOCTYPE html>
<html>
<head> <meta charset="UTF-8">
<title>Handlebars Demo</title>
<!-- dependant files -->
<script src="Handlebars.js"></script>
</head>
<!-- template -->
<script id="template2" type="text/x-handlebars-template">
<div>Chapter stuff:</div>
<ul>{{#each Chapter}}
<ol>{{@index}} {{ChapterName}}
{{#each movies}}
<li>Movie ID:{{movieIDnum}}</li>
{{/each}}
</ol>
{{/each}}
</ul>
</script>
<body><div id="main"></div></body>
<script>
var source = document.getElementById('template2').innerHTML;
var template = Handlebars.compile(source);
var data = {
"Chapter" : {
"ChapterName" : "Introduction",
"chapterNum" : "1",
"movies" : [
{
"movieIDnum" : "16244028",
"movieName" : "Update Test Movie 0",
"movieFileName" : "Test0.mov",
"moviePositionInChapter" : "1"
}
]
},
"Chapter" : {
"ChapterName" : "Welcome",
"chapterNum" : "2",
"movies" : [
{
"movieIDnum" : " 17322365",
"movieName" : "Update Test movie 1",
"movieFileName" : "Test1.mov",
"moviePositionInChapter" : "1"
},
{
"movieIDnum" : " 17326267",
"movieName" : "Update Test movie 3",
"movieFileName" : "Test3.mov",
"moviePositionInChapter" : "2"
}
]
},
"Chapter" : {
"ChapterName" : "The new Interface",
"chapterNum" : "2",
"movies" : [
{
"movieIDnum" : " 1732123476",
"movieName" : "Update Test movie 12",
"movieFileName" : "Test12.mov",
"moviePositionInChapter" : "1"
},
{
"movieIDnum" : " 173262373",
"movieName" : "Update Test movie 9",
"movieFileName" : "Test9.mov",
"moviePositionInChapter" : "2"
},
{
"movieIDnum" : " 173273474",
"movieName" : "Update Test movie 10",
"movieFileName" : "Test10.mov",
"moviePositionInChapter" : "3"
}
]
},
"Chapter" : {
"ChapterName" : "What is an Update?",
"chapterNum" : "4",
"movies" : [
{
"movieIDnum" : " 177342131",
"chapterNum" : "4",
"chapterName" : "What is an Update?",
"movieName" : "Test movie again",
"movieFileName" : "Test13.mov",
"moviePositionInChapter" : "1"
}
]
},
"Chapter" : {
"ChapterName" : "Editing",
"chapterNum" : "5",
"movies" : [
{
"movieIDnum" : " 173290878",
"movieName" : "Update Test movie 14",
"movieFileName" : "Test14mov",
"moviePositionInChapter" : "1"
},
{
"movieIDnum" : " 177344914",
"movieName" : " Movie 15 Test",
"movieFileName" : "Test233.mov",
"moviePositionInChapter" : "2"
}
]
}
}
var result = template(data);
document.write(result);
</script>
</html>
我想知道为什么这不起作用,而不仅仅是“以下是如何以完全不同的格式使用其他4种不同的东西解决问题”。我的理解是,这应该适用于我尝试使用的工具。我想更好地理解这些工具并从过程中学习,而不仅仅是获得解决方案。 (你知道,教一个人钓鱼...... :))
谢谢, Ĵ
答案 0 :(得分:28)
有几点需要改变,首先你不应该写一个带有几个键的对象{ Chapter:, Chapter:, etc...}
另一个建议是检查Handlebars的工作方式,在每种情况下都不需要。希望它澄清。
尝试以下更改:
<!DOCTYPE html>
<html>
<head> <meta charset="UTF-8">
<title>Handlebars Demo</title>
<!-- dependant files -->
<script src="handlebars.js"></script>
</head>
<!-- template -->
<script id="template2" type="text/x-handlebars-template">
<div>Chapter stuff:</div>
<ul>{{#Chapters}}
<ol>{{@index}} {{ChapterName}}
{{#movies}}
<li>Movie ID:{{movieIDnum}}</li>
{{/movies}}
</ol>
{{/Chapters}}
</ul>
</script>
<body><div id="main"></div></body>
<script>
var source = document.getElementById('template2').innerHTML;
var template = Handlebars.compile(source);
var data = [
{
"ChapterName" : "Introduction",
"chapterNum" : "1",
"movies" : [
{
"movieIDnum" : "16244028",
"movieName" : "Update Test Movie 0",
"movieFileName" : "Test0.mov",
"moviePositionInChapter" : "1"
}
]
},
{
"ChapterName" : "Welcome",
"chapterNum" : "2",
"movies" : [
{
"movieIDnum" : " 17322365",
"movieName" : "Update Test movie 1",
"movieFileName" : "Test1.mov",
"moviePositionInChapter" : "1"
},
{
"movieIDnum" : " 17326267",
"movieName" : "Update Test movie 3",
"movieFileName" : "Test3.mov",
"moviePositionInChapter" : "2"
}
]
},
{
"ChapterName" : "The new Interface",
"chapterNum" : "2",
"movies" : [
{
"movieIDnum" : " 1732123476",
"movieName" : "Update Test movie 12",
"movieFileName" : "Test12.mov",
"moviePositionInChapter" : "1"
},
{
"movieIDnum" : " 173262373",
"movieName" : "Update Test movie 9",
"movieFileName" : "Test9.mov",
"moviePositionInChapter" : "2"
},
{
"movieIDnum" : " 173273474",
"movieName" : "Update Test movie 10",
"movieFileName" : "Test10.mov",
"moviePositionInChapter" : "3"
}
]
},
{
"ChapterName" : "What is an Update?",
"chapterNum" : "4",
"movies" : [
{
"movieIDnum" : " 177342131",
"chapterNum" : "4",
"chapterName" : "What is an Update?",
"movieName" : "Test movie again",
"movieFileName" : "Test13.mov",
"moviePositionInChapter" : "1"
}
]
},
{
"ChapterName" : "Editing",
"chapterNum" : "5",
"movies" : [
{
"movieIDnum" : " 173290878",
"movieName" : "Update Test movie 14",
"movieFileName" : "Test14mov",
"moviePositionInChapter" : "1"
},
{
"movieIDnum" : " 177344914",
"movieName" : " Movie 15 Test",
"movieFileName" : "Test233.mov",
"moviePositionInChapter" : "2"
}
]
}
];
var result = template({Chapters: data});
document.write(result);
</script>
</html>
答案 1 :(得分:10)
pdjota是对的。这个答案只是为了展示如何使用每个块助手。
就像明智地指出的pdjota一样,你要覆盖对象的元素,因为它们都有相同的键,即“章节”。因此,将data
转换为对象数组,而不是具有相同键的对象对象。
如果您这样做,您仍然可以将data
传递给template()
。您缺少的是如何引用每个块中使用的对象的属性。这是通过this
完成的。例如,如果您在电影迭代器中,则电影对象的属性引用如下:this.movieIDnum
,this.movieName
等。
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Handlebars Demo</title>
<!-- dependant files -->
<script src="Handlebars.js"></script>
</head>
<!-- template -->
<script id="template2" type="text/x-handlebars-template">
<div>Chapter stuff:</div>
<ul>
{{#each this}}
<ol>Chapter{{this.chapterNum}}: {{this.ChapterName}}
{{#each movies}}
<li>Movie{{this.moviePositionInChapter}}: {{this.movieName}}</li>
{{/each}}
</ol>
{{/each}}
</ul>
</script>
<body><div id="main"></div></body>
<script>
var source = document.getElementById('template2').innerHTML;
var template = Handlebars.compile(source);
var data = [
{
"ChapterName" : "Introduction",
"chapterNum" : "1",
"movies" : [
{
"movieIDnum" : "16244028",
"movieName" : "Update Test Movie 0",
"movieFileName" : "Test0.mov",
"moviePositionInChapter" : "1"
}
]
},
{
"ChapterName" : "Welcome",
"chapterNum" : "2",
"movies" : [
{
"movieIDnum" : " 17322365",
"movieName" : "Update Test movie 1",
"movieFileName" : "Test1.mov",
"moviePositionInChapter" : "1"
},
{
"movieIDnum" : " 17326267",
"movieName" : "Update Test movie 3",
"movieFileName" : "Test3.mov",
"moviePositionInChapter" : "2"
}
]
},
{
"ChapterName" : "The new Interface",
"chapterNum" : "2",
"movies" : [
{
"movieIDnum" : " 1732123476",
"movieName" : "Update Test movie 12",
"movieFileName" : "Test12.mov",
"moviePositionInChapter" : "1"
},
{
"movieIDnum" : " 173262373",
"movieName" : "Update Test movie 9",
"movieFileName" : "Test9.mov",
"moviePositionInChapter" : "2"
},
{
"movieIDnum" : " 173273474",
"movieName" : "Update Test movie 10",
"movieFileName" : "Test10.mov",
"moviePositionInChapter" : "3"
}
]
},
{
"ChapterName" : "What is an Update?",
"chapterNum" : "4",
"movies" : [
{
"movieIDnum" : " 177342131",
"chapterNum" : "4",
"chapterName" : "What is an Update?",
"movieName" : "Test movie again",
"movieFileName" : "Test13.mov",
"moviePositionInChapter" : "1"
}
]
},
{
"ChapterName" : "Editing",
"chapterNum" : "5",
"movies" : [
{
"movieIDnum" : " 173290878",
"movieName" : "Update Test movie 14",
"movieFileName" : "Test14mov",
"moviePositionInChapter" : "1"
},
{
"movieIDnum" : " 177344914",
"movieName" : " Movie 15 Test",
"movieFileName" : "Test233.mov",
"moviePositionInChapter" : "2"
}
]
}
];
var result = template(data);
document.write(result);
</script>
</html>