如何使元素的可见度.hide(), .show(),或.toggle()?
如果一个元素是visible或hidden?
当前回答
简单检查display属性(或)visibility取决于您喜欢何种隐形。例如:
if ($('#invisible').css('display') == 'none') {
// This means the HTML element with ID 'invisible' has its 'display' attribute set to 'none'
}
其他回答
这里有一个永久有条件的表达式 来检查元素的状态 然后切换它:
$('someElement').on('click', function(){ $('elementToToggle').is(':visible') ? $('elementToToggle').hide('slow') : $('elementToToggle').show('slow'); });
$('#clickme').click(function() {
$('#book').toggle('slow', function() {
// Animation complete.
alert($('#book').is(":visible")); //<--- TRUE if Visible False if Hidden
});
});<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="clickme">
Click here
</div>
<img id="book" src="https://upload.wikimedia.org/wikipedia/commons/8/87/Google_Chrome_icon_%282011%29.png" alt="" width="300"/>来源(来自我的博客):
您也可以使用 plain JavaScript 来做到这一点 :
function isRendered(domObj) {
if ((domObj.nodeType != 1) || (domObj == document.body)) {
return true;
}
if (domObj.currentStyle && domObj.currentStyle["display"] != "none" && domObj.currentStyle["visibility"] != "hidden") {
return isRendered(domObj.parentNode);
} else if (window.getComputedStyle) {
var cs = document.defaultView.getComputedStyle(domObj, null);
if (cs.getPropertyValue("display") != "none" && cs.getPropertyValue("visibility") != "hidden") {
return isRendered(domObj.parentNode);
}
}
return false;
}
注:
到处工作
嵌套元素的工程
CSS 和内嵌样式的工作
不需要框架
此选项可以检查标签是否可见
// using a pure CSS selector
if ($('p:visible')) {
alert('Paragraphs are visible (checked using a CSS selector) !');
};
// using jQuery's is() method
if ($('p').is(':visible')) {
alert('Paragraphs are visible (checked using is() method)!');
};
// using jQuery's filter() method
if ($('p').filter(':visible')) {
alert('Paragraphs are visible (checked using filter() method)!');
};
// you can use :hidden instead of :visible to reverse the logic and check if an element is hidden
// if ($('p:hidden')) {
// do something
// }; $(document).ready(function() {
var visible = $('#tElement').is(':visible');
if(visible) {
alert("visible");
// Code
}
else
{
alert("hidden");
}
});<script src="https://code.jquery.com/jquery-1.10.2.js"></script>
<input type="text" id="tElement" style="display:block;">Firstname</input>