Handlebars嵌套'each'语法 - 不迭代每个元素

时间：2022-07-23 14:30:04

I am brand new at this Javascript/JSON/Handlebars thing, and I am having trouble getting a JSON object, with two nested levels, to work in a Handlebars template.

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。

I have validated the JSON object with JSONLint, so it is valid JSON code, but I don't know if I have the correct JSON format to make the template work correctly. :) (I am building the JSON manually in another system.) Or perhaps it is the syntax of the template that I have incorrect. That's what I hope to find out...

我已经使用JSONLint验证了JSON对象，因此它是有效的JSON代码，但我不知道我是否具有正确的JSON格式以使模板正常工作。 ：）（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......

The short description: this object is a table of contents. I have Chapters and then the movies within each Chapter. So the Movies are nested elements of each Chapter element.

简短说明：此对象是目录。我有章节，然后是每章内的电影。因此，电影是每个章节元素的嵌套元素。

I want HTML output similar to:

我想要HTML输出类似于：

Chapter1:  ChapterName
       Movie1: MovieName
       Movie2: MovieName
Chapter2:  Chaptername
       Movie1: MovieName
       Movie2: MovieName
       Movie3: MovieName

I seem to end up with only 1 instance of the data (the last element in my JSON object), or I get nothing at all. (Depends on which little tweak or version I try.) The browser console doesn't show any errors.

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。

Here's all the code that I have been trying to use so far (scripts, HTML, template, etc):

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>

I would like to know why THIS doesn't work, not just a "Here's how to solve your problem using 4 other different things in a totally different format". It is my understanding that this SHOULD be workable with the tools I am trying to use. I would like to better understand these tools and learn from the process, not just get a solution. (You know, teach a man to fish... :) )

我想知道为什么这不起作用，而不仅仅是“以下是如何使用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......））

Thanks, J

谢谢，J

2 个解决方案

#1

25  

there are a couple of changes to suggest, first you shouldn't write an object with several keys { Chapter:, Chapter:, etc...} The other suggestion is to review the way Handlebars works, it doesn't need each in every case. Hope it clarifies Try these changes:

有几个变化需要建议，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，它不需要每个每个案例。希望它澄清尝试这些更改：

<!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>

#2

9  

pdjota is right on. This answer is just to show how to use the each block helper if you wanted.

pdjota是对的。这个答案只是为了展示如何使用每个块助手。

Like pdjota wisely pointed out, you are overwriting the elements of your object because they all have the same key i.e., "Chapter". So turn data into an array of objects instead of an object of objects that have the same key.

就像明智地指出的pdjota一样，你要覆盖你对象的元素，因为它们都有相同的键，即“Chapter”。因此，将数据转换为对象数组，而不是具有相同键的对象对象。

If you do that, you can still pass data into template(). What you were missing was how to reference properties of objects used in the each block. That is done with this. For example, if you are in the movies iterator, properties of the movies object are referenced like this: this.movieIDnum, this.movieName, etc.

如果这样做，您仍然可以将数据传递到template（）。您缺少的是如何引用每个块中使用的对象的属性。这是通过这个完成的。例如，如果您在电影迭代器中，则电影对象的属性如下所示：this.movi​​eIDnum，this.movi​​eName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>

#1

25  

there are a couple of changes to suggest, first you shouldn't write an object with several keys { Chapter:, Chapter:, etc...} The other suggestion is to review the way Handlebars works, it doesn't need each in every case. Hope it clarifies Try these changes:

有几个变化需要建议，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，它不需要每个每个案例。希望它澄清尝试这些更改：

<!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>

#2

9  

pdjota is right on. This answer is just to show how to use the each block helper if you wanted.

pdjota是对的。这个答案只是为了展示如何使用每个块助手。

Like pdjota wisely pointed out, you are overwriting the elements of your object because they all have the same key i.e., "Chapter". So turn data into an array of objects instead of an object of objects that have the same key.

就像明智地指出的pdjota一样，你要覆盖你对象的元素，因为它们都有相同的键，即“Chapter”。因此，将数据转换为对象数组，而不是具有相同键的对象对象。

If you do that, you can still pass data into template(). What you were missing was how to reference properties of objects used in the each block. That is done with this. For example, if you are in the movies iterator, properties of the movies object are referenced like this: this.movieIDnum, this.movieName, etc.

如果这样做，您仍然可以将数据传递到template（）。您缺少的是如何引用每个块中使用的对象的属性。这是通过这个完成的。例如，如果您在电影迭代器中，则电影对象的属性如下所示：this.movi​​eIDnum，this.movi​​eName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>
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