document.getElementsByClassName()。innerHTML总是返回“undefined” [英] document.getElementsByClassName().innerHTML always returns "undefined"
问题描述
我一定在某处犯了错,所以 document.getElementsByClassName()。innerHTML
总是返回 undefined 。
首先我通过javascript生成< li>
:
$('#list')。append('< li class =box>< img class =picturesrc =images / HotPromo / tagPhoto1.png/> < p class =name>< b>名称< / b>< / p>< p class =address>地址< / p>< p class =hidden><< p ; / p>< /立GT;');
请注意,在最右边,我有一个< p>
元素与隐藏
类。我使用它来获取我不想显示给我的用户的 id 。
这是用于生成这些数据的jQuery < li>
:
$(。box)。 each(function(){
var name,address,picture,id =;
if(i< result.length){
name = result [i] .name;
address = result [i] .address;
picture = result [i] .boxpicture;
id = result [i] .mallid;
}
$(this).find(。name)。html(name);
$(this).find(。address)。html(address);
$(this)。 find(。picture)。attr(src,picture);
$(this).find(。hidden)。html(id);
i ++;
} );
我试图检查数据,并且它的工作正常。
现在,假设用户点击其中一个<$>时,我想提醒隐藏的 id < p>
c $ c>< li class =box>
$(。box)。click(function(){
alert(document.getElementsByClassName('hidden')。innerHTML);
});
但是,此警报总是返回未定义的。
所以它应该是:
$ p $ document.getElementsByClassName('hidden')[0 ] .innerHTML
并且您可能有更多 .hidden
元素,并且只需要当前 .box
中的一个(这将是 this
在事件处理程序中)
this.getElementsByClassName('hidden')[0] .innerHTML
但是为什么不是jQuery
$(。box ).click(function(){
alert($('。hidden',this).html());
});
I must have made a mistake somewhere so the document.getElementsByClassName().innerHTML
is always returning undefined.
First i generate the <li>
via javascript :
$('#list').append('<li class="box"><img class="picture" src="images/HotPromo/tagPhoto1.png"/><p class="name"><b>Name</b></p><p class="address">Address</p><p class="hidden"></p></li>');
Note that in the most right i have a <p>
element with hidden
class. I use this to get the id which i dont want to show to my users.
And this is the jQuery to generate the data on those <li>
:
$(".box").each(function () {
var name, address, picture, id = "";
if (i < result.length) {
name = result[i].name;
address = result[i].address;
picture = result[i].boxpicture;
id = result[i].mallid;
}
$(this).find(".name").html(name);
$(this).find(".address").html(address);
$(this).find(".picture").attr("src", picture);
$(this).find(".hidden").html(id);
i++;
});
I have tried to check the data, and its working fine.
Now, lets say i want to alert the hidden id <p>
when user clicks one of those <li class="box">
that i generated above:
$(".box").click(function () {
alert(document.getElementsByClassName('hidden').innerHTML);
});
However this alert always returning "undifined".
document.getElementsByClassName()
returns a nodeList, not an element!
So it should be :
document.getElementsByClassName('hidden')[0].innerHTML
and as you probably have more .hidden
elements, and only want the one inside the current .box
(which would be this
in the event handler)
this.getElementsByClassName('hidden')[0].innerHTML
but why not jQuery
$(".box").click(function(){
alert( $('.hidden', this).html() );
});
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