[英]only load iframe when link is clicked
如何一次显示一个iframe? 因此,我有一个索引网页,该网页在导航栏中具有指向iframe的链接,但是我希望仅在单击链接时才显示iframe吗? 现在它们都在显示。这是JavaScript解决方案吗? 我是编码的新手,如果这样,那么不使用iframe并设置不同的页面并指定ID可能对我来说更容易些。
这是我的代码: http : //jsfiddle.net/r2mmb/
HTML
<header>
<div id="logo">
<img src="../../assets/images/logo.png" alt="">
</div>
<nav>
<ul>
<li><a href="iframetoursprices.html" target="toursprices">
TOURS,PRICES & STANDARD FLIGHTS</a></li>
<li><a href="#">MEET THE STAFF</a></li>
<li><a href="iframegallery.html" target="gallery">Gallery</a></li>
</ul>
</nav>
</header>
<div class="mainInfo">
<iframe src="iframetoursprices.html" name="toursprices"></iframe>
<iframe src="iframegallery.html" name="gallery"></iframe>
</div>
我建议的一种方法是先用CSS隐藏所有<iframe>
元素:
iframe {
display: none;
}
并使用class
创建CSS规则以显示该元素:
iframe.inUse {
display: block;
}
使用jQuery:
// binds a click handler to all 'a' elements with a 'target' attribute:
$('a[target]').click(function(){
// creates a reference to the clicked-link:
var clickedEl = this;
// gets all 'iframe' elements in the document:
$('iframe')
// removes the 'inUse' class from all of them:
.removeClass('inUse')
// filters the collection of 'iframe' elements:
.filter(function(){
// we keep only the 'iframe' whose 'name' attribute
// is equal to the 'name' attribute of the clicked 'a':
return this.name === clickedEl.target;
// and we add the 'inUse' class to that iframe element:
}).addClass('inUse');
});
JS小提琴演示 。
一种替代方法是在页面上只有一个<iframe>
元素,并使用CSS将其隐藏:
iframe {
display: none;
}
并使用以下jQuery将内容加载到单个<iframe>
:
$('a[target]').click(function(e){
// prevents the default click-behaviour of the link:
e.preventDefault();
// finds the 'iframe' element with the name of 'showContent':
$('iframe[name="showContent"]')
// sets its 'src' property equal to the 'href' property of the clicked link:
.prop('src', this.href)
// shows the 'iframe':
.show();
});
JS小提琴演示 。
一个迟来的编辑(使用纯JavaScript),是基于对jQuery不能使用的一些迟来的解释而进行的:
function contentToIframe () {
// getting a reference to the 'iframe' element whose 'name' attribute
// is equal to the clicked element's 'target' attribute, using CSS
// notation available under document.querySelector() (which returns
// only the first element that matches the selector):
var iframe = document.querySelector('iframe[name="' + this.target + '"]'),
// getting a reference to the current 'display' (inline) style of
// the 'iframe' (found above):
curDisplay = iframe.style.display;
// setting the 'src' property of the 'iframe' equal to the 'href'
// of the clicked link:
iframe.src = this.href;
// if the 'iframe' doesn't have a set 'display' style-property, or
// it is not set to 'block':
if (!curDisplay || curDisplay !== 'block') {
// we set it to 'block' to make it visible:
iframe.style.display = 'block';
}
}
// getting all the 'a' elements in the document that also have a 'target'
// attribute:
var links = document.querySelectorAll('a[target]');
// iterating over those link elements:
for (var i = 0, len = links.length; i < len; i++) {
// binding an event-handler to deal with the click event,
// which executes the function:
links[i].addEventListener('click', contentToIframe);
}
JS小提琴演示 。
上述方法的最终迭代(仍然是纯JavaScript),现在也可以在单击链接以加载内容时滚动到<iframe>
:
function contentToIframe() {
var iframe = document.querySelector('iframe[name="' + this.target + '"]'),
curDisplay = iframe.style.display,
// getting a reference to the current position of the 'iframe' element:
position = iframe.getBoundingClientRect();
iframe.src = this.href;
if (!curDisplay || curDisplay !== 'block') {
iframe.style.display = 'block';
// if the 'iframe' wasn't visible it's position would have been 0,0;
// so once we've made it visible we re-get its new (now visible)
// coordinates:
position = iframe.getBoundingClientRect();
}
// force the window to scrollTo the current position (x,y) of the 'iframe':
window.scrollTo(position.left, position.top);
}
var links = document.querySelectorAll('a[target]');
for (var i = 0, len = links.length; i < len; i++) {
links[i].addEventListener('click', contentToIframe);
}
JS小提琴演示 。
参考文献:
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