添加EventListener JavaScript时“无法读取null的属性addEventListener”
[英]"Cannot read property addEventListener of null" when adding EventListener JavaScript
问题描述
I am trying to add an eventListener to a variable set to an element.
我正在尝试将 eventListener 添加到设置为元素的变量中。 The code is this:代码是这样的：
var c = document.getElementById("some_element");
c.addEventListener("click", someFunction);
(BTW if it helps the element is a button .) （顺便说一句，如果它有助于元素是一个按钮。）
1 个解决方案
解决方案1
7 已采纳 2018-10-28 06:48:15
It seems this code is getting execute before the dom is ready & at that point the element is available in DOM so it is throwing null似乎这段代码在 dom 准备好之前正在执行 & 那时元素在 DOM 中可用所以它抛出null
Try by adding the code neae closing end of body tag尝试通过添加代码 neae 结束 body 标签结束
<body>
// rest of html elmeent
<script>
var c = document.getElementById("some_element");
c.addEventListener("click", someFunction);
</script>
</body>
Also you can put your code inside window.onload你也可以把你的代码放在window.onload里面
window.onload = function(){
var c = document.getElementById("some_element");
c.addEventListener("click", someFunction);
}
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