javascript 未捕获的类型错误：无法读取未定义的属性“html”
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Uncaught TypeError: Cannot read property 'html' of undefined
提问by Chuie
I am trying to have a google map display on my webpage using backbone.js and handlebars.js, but I can't get it to display. When I load the page, I get this error in my javascript console:
我正在尝试使用backbone.js 和handlebars.js 在我的网页上显示谷歌地图，但无法显示。当我加载页面时，我在我的 javascript 控制台中收到此错误：
Uncaught TypeError: Cannot read property 'html' of undefined
未捕获的类型错误：无法读取未定义的属性“html”
Does anyone know what I am doing wrong? Any and all suggestions welcome.
有谁知道我做错了什么？欢迎任何和所有建议。
index.html
索引.html
<!DOCTYPE html>
<html>
<head>
{% load staticfiles %}
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta http-equiv="cleartype" content="on">
<link rel="stylesheet" href="{% static 'bootstrap/css/bootstrap.css' %}">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
<script src="{% static 'bootstrap/js/bootstrap.js' %}"></script>
<script src="http://ajax.cdnjs.com/ajax/libs/underscore.js/1.1.4/underscore-min.js"></script>
<script src="http://ajax.cdnjs.com/ajax/libs/backbone.js/0.3.3/backbone-min.js"></script>
<script src="{% static 'django_project/js/handlebars.js' %}"></script>
<link href="https://fonts.googleapis.com/css?family=Raleway:400,700,200" rel="stylesheet" type="text/css">
<script src="https://maps.googleapis.com/maps/api/js?v=3&sensor=false"></script>
</head>
<body>
<script type="text/x-mustache-template" id="grid-12-template">
<div id="googleMapBox" class="box-content"></div>
</script>
<script src="{% static 'django_project/js/django_project.js' %}"></script>
<script>
var GoogMap = new GoogleMap;
GoogMap.render();
</script>
</body>
</html>
django_project.js
django_project.js
var template = function (name) {
var source = $('#' + name + '-template').html();
return Handlebars.compile(source);
};
var GoogleMap = Backbone.View.extend({
template: template('grid-12'),
initialize: function() {},
activate: function() {
var mapOptions = {
zoom: 8,
center: new google.maps.LatLng(-34.397, 150.644),
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var domElement = this.$('#googleMapBox');
this.map = new google.maps.Map(domElement.get(0), mapOptions);
},
render: function() {
this.$el.html(this.template(this));
this.activate();
return this;
}
});
采纳答案by Chuie
for some reason this.$el.html(...) was causing the problem. Even if I specified el in the view it wouldn't work. this is the code that worked.
由于某种原因 this.$el.html(...) 导致了问题。即使我在视图中指定了 el 它也不起作用。这是有效的代码。
django_project.js
django_project.js
var template = function (name) {
var source = $('#' + name + '-template').html();
return Handlebars.compile(source);
};
var GoogleMap = Backbone.View.extend({
el: $('#map-canvas'),
template: template('grid-12'),
initialize: function () {
this.render();
},
activate: function () {
var mapOptions = {
zoom: 8,
center: new google.maps.LatLng(-34.397, 150.644),
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var domElement = $('#googleMapBox');
this.map = new google.maps.Map(domElement.get(0), mapOptions);
},
render: function () {
$('#map-canvas').html(this.template(this));
this.activate();
return this;
}
});
$(function () {
var GoogMap = new GoogleMap();
});
index.html
索引.html
...
<div id="map-canvas"></div>
<script type="text/x-mustache-template" id="grid-12-template">
<div id = "googleMapBox"
class = "box-content"
style = "height: 600px; background-color: #b0c4de;" > </div >
</script>
...
