javascript 获取元素的 ID 并将其与字符串或另一个 ID 进行比较
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Get an element's ID and compare it to a string OR another ID
提问by AquaSoley
How can I get the ID of an element and compare it to a string OR another id ?
如何获取元素的 ID 并将其与字符串或另一个 id 进行比较？
What I would like to do exactly is make a condition that would get the element's ID and compare it to a certain string or another element's ID.
我想要做的正是创建一个条件来获取元素的 ID 并将其与某个字符串或另一个元素的 ID 进行比较。
I have this piece of code right now to compare my id to another id (which obviously doesn't work):
我现在有这段代码可以将我的 id 与另一个 id 进行比较（这显然不起作用）：
function Something(elemid)
{
if(elemid == document.getElementById('myid').id)
{
...
}
}
Or this piece of code to compare to a string (doesn't work either):
或者这段代码与字符串进行比较（也不起作用）：
if(elemid == "mystring")
{
...
}
This is a simple problem, but still, I can't seem to find anything around here or even on other websites that would be what I am searching for. I can't use any JQuery whatsoever, so any Javascript only anwser would be really appreciated.
这是一个简单的问题，但是，我似乎无法在这里或什至在其他网站上找到我正在搜索的内容。 我不能使用任何 JQuery，因此任何仅使用 Javascript 的 anwser 将不胜感激。
回答by Darren
if(elemid = document.getElementById('myid').id)
{
...
}
You need to compare it using ==. A single =is assign.
您需要使用==. 单个=是分配。
Also document.getElementById('myid').idis completely useless. You are specifying the iddirectly and then attempt to return it.
也是document.getElementById('myid').id完全没用的。您正在id直接指定，然后尝试返回它。
As a simple test to show you how to compare an element.
作为向您展示如何比较元素的简单测试。
<input type="text" id="hello" class="test" />
var element = document.getElementsByClassName("test")[0].id;
if (element === "hello") {
alert("Working");
}
回答by a_p
How are you calling the function from jsp?
你是如何从jsp调用函数的？
This code works for me:
这段代码对我有用：
function getValue(elementId)
{
if(document.getElementById("myHeader").id = elementId)
{
alert('It Works!');
}
}
and in the jsp
并在jsp中
<h1 id="myHeader" onclick="getValue('myHeader')">Click me!</h1>
<h1 id="myHeader" onclick="getValue('myHeader')">Click me!</h1>
