我有一个突变观察者(subtree:true(。我显示添加的所有节点(我想(。当我使用Console.Log(Mutation.target.tagname(进行监视时,我会看到Div and Body等...但是,我现在需要在所有添加的标签中添加一个侦听器(实际上是一个用于Onplay,一个用于Onpause(
知道我如何在添加的儿童诺德斯中找到(和反应(所有添加的视频标签?
var target = document.body;
//then define a new observer
var bodyObserver = new MutationObserver(function (mutations) {
mutations.forEach(function (mutation) {
//How do i egt the video tags to add a listener?
console.log("mutation detected: " + mutation.target.tagName);
if (mutation.target.tagName == "VIDEO") {
mutation.target.onclick =function () { console.log("The video has been clicked")}
}
})
})
var bodyObserverConfig = { attributes: true, childList: true, subtree: true,
characterData: true };
bodyObserver.observe(target, bodyObserverConfig);
添加的节点在 MutationRecord
的 addedNodes
属性中列出(https://developer.mozilla.org/en-us/docs/web/api/maintrecord((在您的情况下,mutation
(。您必须迭代此列表并搜索视频节点。
这是一个示例:
如果Stackoverflow代码段不起作用 - 尝试Codepen https://codepen.io/bsalex/pen/wmgvry。
var target = document.body;
//then define a new observer
function addVideoHandler(node) {
if (node.tagName == "VIDEO") {
node.onclick = function() {
alert("The video has been clicked");
};
}
}
var bodyObserver = new MutationObserver(function(mutations) {
mutations.forEach(function(mutation) {
//How do i egt the video tags to add a listener?
console.log("mutation detected: " + mutation.target.tagName);
mutation.addedNodes.forEach(addedNode => {
addVideoHandler(addedNode);
// it might be text node or comment node which don't have querySelectorAll
addedNode.querySelectorAll && addedNode.querySelectorAll("video").forEach(addVideoHandler);
});
});
});
var bodyObserverConfig = {
attributes: true,
childList: true,
subtree: true,
characterData: true
};
bodyObserver.observe(target, bodyObserverConfig);
// Example tools code below
document
.querySelector(".add-videos-here-action")
.addEventListener("click", () => {
const videoElement = document.createElement("video");
document.querySelector(".add-videos-here").appendChild(videoElement);
});
document
.querySelector(".add-nested-videos-here-action")
.addEventListener("click", () => {
const wrappingElement = document.createElement("div");
wrappingElement.innerHTML =
"<div><p><video /></p></div><div><video /></div>";
document.querySelector(".add-videos-here").appendChild(wrappingElement);
});
document
.querySelector(".add-not-videos-here-action")
.addEventListener("click", () => {
const notVideoElement = document.createElement("div");
notVideoElement.textContent = "It is not a video";
document.querySelector(".add-videos-here").appendChild(notVideoElement);
});
document
.querySelector(".add-videos-here-too-action")
.addEventListener("click", () => {
const videoElement = document.createElement("video");
document.querySelector(".add-videos-here-too").appendChild(videoElement);
});
video {
min-width: 100px;
min-height: 100px;
border: 1px solid red;
}
<button class="add-videos-here-action">Add video</button>
<button class="add-not-videos-here-action">Add NOT video</button>
<button class="add-videos-here-too-action">Add another video</button>
<div>
<div class="add-videos-here">
</div>
<div class="add-videos-here-too">
</div>
</div>