尝试将对象参数传递给onclick函数时,元素列表后出现SyntaxError:缺少] [英] SyntaxError: missing ] after element list when try to pass object parameter to onclick function
问题描述
我正在尝试迭代对象列表,并使用按钮为每个对象创建一个列表项.当我向它们添加onclick
功能时.我收到此错误:
I am trying to iterate a list of objects, and create a list item for each of them with as a button. When I add onclick
function to them. I got this error:
SyntaxError:元素列表后缺少]
SyntaxError: missing ] after element list
这是我的代码:
box_resources.forEach(function(box){
$("#box-resources-list").append('<li><button type="button" class="list-group-item" onclick="showBoxMarker(' + box + ')">' + box.title + '</button></li>');
});
有任何想法吗?谢谢!
推荐答案
问题是在创建类似元素时box
会转换为字符串.例如:
The problem is that box
is converted to a string when you're creating elements like that. For example:
var box = {
x: 10,
y: 10,
w: 5,
h: 3
};
console.log('onclick="showBoxMarker(' + box + ')"');
很明显,调用showBoxMarker([object Object])
是无效的语法.相反,您应该单独创建元素,然后将事件处理程序附加到该元素.
Obviously, calling showBoxMarker([object Object])
isn't valid syntax. Instead, you should create the elements separately then attach an event handler to that element.
box_resources.forEach(function(box){
var $listItem = $('<li><button type="button" class="list-group-item">' + box.title + '</button></li>');
// Find the button we just made and attach the click handler
$listItem.find('button').click(function() {
showBoxMarker(box);
});
$('#box-resources-list').append($listItem);
});
工作示例:
var showBoxMarker = function(box) {
alert(box.title);
}
var box_resources = [
{ title: 'Box A' },
{ title: 'Box B' },
{ title: 'Box C' },
{ title: 'Box D' },
{ title: 'Box E' }
];
box_resources.forEach(function(box){
var $listItem = $('<li><button type="button" class="list-group-item">' + box.title + '</button></li>');
// Find the button we just made and attach the click handler
$listItem.find('button').click(function() {
showBoxMarker(box);
});
$('#box-resources-list').append($listItem);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul id="box-resources-list"></ul>
提示:通常,最好是从某种模板而不是从JS中的字符串创建新元素,并在父元素上创建一个单击处理程序,并使用事件委托来处理单个元素上的单击事件.
Pro-tip: In general, it's better to create new elements from some kind of template instead of from strings in JS and create one click handler on a parent element and use event delegation to handle click events on individual elements.
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