javascript setAttribute('src','page.html') 不起作用
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setAttribute('src','page.html') is not working
提问by Amarundo
I have the following JavaScript to rotate pages in a iframetag every 5 seconds.
我有以下 JavaScriptiframe每 5 秒在标签中旋转页面。
function setPage() {
if (i == pages.length) {
i = 0;
}
alert(pages[i]); //verify the right url is there
var elmnt = document.getElementById('dashboard');
elmnt.setAttribute('src', pages[i]);
i++;
}
setInterval("setPage()", 5000);
The loop, interval, etc., is working. However, nothing changes for the srcattribute of my iframetag.
循环、间隔等正在工作。但是，src我的iframe标签属性没有任何变化。
I tested with both IE8 and Chrome.
我用 IE8 和 Chrome 进行了测试。
What am I doing wrong? How can I accomplish that (no jQuery...)
我究竟做错了什么？我怎样才能做到这一点（没有 jQuery ...）
回答by VisioN
I'd suggest you to use elmnt.src = pages[i]instead.
我建议你elmnt.src = pages[i]改用。
If it still gives you error, then most probably you are trying to target element, that doesn't have srcproperty. Check that elemt.tagNamegives you IFRAME.
如果它仍然给您错误，那么很可能您正在尝试定位没有src属性的元素。检查elemt.tagName给你IFRAME。
回答by Paul Gleeson
Have you tried just manually setting the src property of the iframe?
您是否尝试过手动设置 iframe 的 src 属性？
document.getElementById('dashboard').src = pages[i];
回答by ultranaut
As you have it now, each time setPagegets called, the value iis undefined; if you want the value of ito be held from call to call, you need to set it in a closure:
正如你现在拥有它，每次setPage被调用，该值i是undefined; 如果您希望i从呼叫到呼叫都保持的值，则需要将其设置在闭包中：
var setPage = (function () {
var i = 0;
return function () {
if (i == pages.length) {
i = 0;
}
var elmnt = document.getElementById('dashboard');
elmnt.setAttribute('src', pages[i]);
i++;
}
}());
Also when setting the interval, the first argument should just be the name of the function, no quotes or parens:
同样在设置间隔时，第一个参数应该只是函数的名称，没有引号或括号：
setInterval(setPage, 5000);
There's a couple other tweaks you could make to it, but that should get it running.
您还可以对其进行一些其他调整，但这应该可以使其运行。
