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[英]Is there a Javascript event fired when currentSrc for an <img> tag changes?
[英]OnClick event not fired in javascript when attached to img
我是JavaScript的新手,所以這可能是基本的...
我正在嘗試動態創建圖像並將其添加為“ onclick”的事件監聽器。 我將此img
添加到div
。
我這樣創建img:
function createNewSmiley()
{
var newSmiley = document.createElement("img");
newSmiley.src = "./smiley.jpg";
newSmiley.alt = "Smiley Image";
newSmiley.style.width = "64px";
newSmiley.style.height = "64px";
return newSmiley;
}
然后像這樣使用將其添加到div中:
function positionNewSmiley(parent, smiley, x, y)
{
var newSmiley = createNewSmiley();
newSmiley.style.top = y + "px";
newSmiley.style.left = x + "px";
parent.appendChild(newSmiley);
}
這是我的主要功能:
function main(smileyCount)
{
var myDiv = document.getElementById("myDiv");
for (var i = 0; i < smileyCount;i++)
{
var x = Math.floor((Math.random() * 500));
var y = Math.floor((Math.random() * 500));
var smiley = createNewSmiley();
smiley.onclick = smileyClicked;
positionNewSmiley(myDiv, smiley, x, y);
}
}
function smileyClicked(ev) {
alert("OK");
}
但是onclick
事件不會觸發!
但是,如果我將事件偵聽器添加到div-它將。
我究竟做錯了什么?
如果您在create函數中添加on click,它將起作用
function createNewSmiley()
{
var newSmiley = document.createElement("img");
newSmiley.src = "./smiley.jpg";
newSmiley.alt = "Smiley Image";
newSmiley.style.width = "64px";
newSmiley.style.height = "64px";
newSmiley.addEventListener("click", smileyClicked);
return newSmiley;
}
如以上注釋中所述,當您要放置傳遞的smiley
時,您將在positionNewSmiley
創建新的smiley
:
var smiley = createNewSmiley();
smiley.onclick = smileyClicked;
positionNewSmiley(myDiv, smiley, x, y);
_________________________^^^^^^
只需在position函數中使用它:
function positionNewSmiley(parent, smiley, x, y)
{
smiley.style.top = y + "px";
smiley.style.left = x + "px";
parent.appendChild(smiley);
}
希望這可以幫助。
function createNewSmiley() { var newSmiley = document.createElement("img"); newSmiley.src = "http://cfile24.uf.tistory.com/image/163BB51F4BF9DF7431AB10"; newSmiley.alt = "Smiley Image"; newSmiley.style.width = "64px"; newSmiley.style.height = "64px"; return newSmiley; } function positionNewSmiley(parent, smiley, x, y) { smiley.style.top = y + "px"; smiley.style.left = x + "px"; parent.appendChild(smiley); } function main(smileyCount) { var myDiv = document.getElementById("myDiv"); for (var i = 0; i < smileyCount;i++) { var x = Math.floor((Math.random() * 500)); var y = Math.floor((Math.random() * 500)); var smiley = createNewSmiley(); smiley.onclick = smileyClicked; positionNewSmiley(myDiv, smiley, x, y); } } function smileyClicked(ev) { alert("OK"); } main(6);
<div id='myDiv'></div>
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