$("*").click(function(){
$(this); // how can I get selector from $(this) ?
});
Is there an easy way to get selector from $(this)? There is a way to select an element by its selector, but what about getting the selector from element?
This will return right away if there is an ID on the element. I also added a name attribute check and a nth-child selector in case a element has no id, class, or name.
名称可能需要范围界定,以防页面上有多个表单并具有相似的输入,但我还没有处理这个问题。
function getSelector(el){
var $el = $(el);
var id = $el.attr("id");
if (id) { //"should" only be one of these if theres an ID
return "#"+ id;
}
var selector = $el.parents()
.map(function() { return this.tagName; })
.get().reverse().join(" ");
if (selector) {
selector += " "+ $el[0].nodeName;
}
var classNames = $el.attr("class");
if (classNames) {
selector += "." + $.trim(classNames).replace(/\s/gi, ".");
}
var name = $el.attr('name');
if (name) {
selector += "[name='" + name + "']";
}
if (!name){
var index = $el.index();
if (index) {
index = index + 1;
selector += ":nth-child(" + index + ")";
}
}
return selector;
}
!(function ($, undefined) {
/// adapted http://jsfiddle.net/drzaus/Hgjfh/5/
var get_selector = function (element) {
var pieces = [];
for (; element && element.tagName !== undefined; element = element.parentNode) {
if (element.className) {
var classes = element.className.split(' ');
for (var i in classes) {
if (classes.hasOwnProperty(i) && classes[i]) {
pieces.unshift(classes[i]);
pieces.unshift('.');
}
}
}
if (element.id && !/\s/.test(element.id)) {
pieces.unshift(element.id);
pieces.unshift('#');
}
pieces.unshift(element.tagName);
pieces.unshift(' > ');
}
return pieces.slice(1).join('');
};
$.fn.getSelector = function (only_one) {
if (true === only_one) {
return get_selector(this[0]);
} else {
return $.map(this, function (el) {
return get_selector(el);
});
}
};
})(window.jQuery);
简化的 Javascript
// http://stackoverflow.com/questions/2420970/how-can-i-get-selector-from-jquery-object/15623322#15623322
!function(e,t){var n=function(e){var n=[];for(;e&&e.tagName!==t;e=e.parentNode){if(e.className){var r=e.className.split(" ");for(var i in r){if(r.hasOwnProperty(i)&&r[i]){n.unshift(r[i]);n.unshift(".")}}}if(e.id&&!/\s/.test(e.id)){n.unshift(e.id);n.unshift("#")}n.unshift(e.tagName);n.unshift(" > ")}return n.slice(1).join("")};e.fn.getSelector=function(t){if(true===t){return n(this[0])}else{return e.map(this,function(e){return n(e)})}}}(window.jQuery)
用法和陷阱
<html>
<head>...</head>
<body>
<div id="sidebar">
<ul>
<li>
<a href="/" id="home">Home</a>
</li>
</ul>
</div>
<div id="main">
<h1 id="title">Welcome</h1>
</div>
<script type="text/javascript">
// Simple use case
$('#main').getSelector(); // => 'HTML > BODY > DIV#main'
// If there are multiple matches then an array will be returned
$('body > div').getSelector(); // => ['HTML > BODY > DIV#main', 'HTML > BODY > DIV#sidebar']
// Passing true to the method will cause it to return the selector for the first match
$('body > div').getSelector(true); // => 'HTML > BODY > DIV#main'
</script>
</body>
</html>
function getSelector(el)
{
var $el = jQuery(el);
var selector = $el.parents(":not(html,body)")
.map(function() {
var i = jQuery(this).index();
i_str = '';
if (typeof i != 'undefined')
{
i = i + 1;
i_str += ":nth-child(" + i + ")";
}
return this.tagName + i_str;
})
.get().reverse().join(" ");
if (selector) {
selector += " "+ $el[0].nodeName;
}
var index = $el.index();
if (typeof index != 'undefined') {
index = index + 1;
selector += ":nth-child(" + index + ")";
}
return selector;
}
function getSelectorFromElement($el) {
if (!$el || !$el.length) {
return ;
}
function _getChildSelector(index) {
if (typeof index === 'undefined') {
return '';
}
index = index + 1;
return ':nth-child(' + index + ')';
}
function _getIdAndClassNames($el) {
var selector = '';
// attach id if exists
var elId = $el.attr('id');
if(elId){
selector += '#' + elId;
}
// attach class names if exists
var classNames = $el.attr('class');
if(classNames){
selector += '.' + classNames.replace(/^\s+|\s+$/g, '').replace(/\s/gi, '.');
}
return selector;
}
// get all parents siblings index and element's tag name,
// except html and body elements
var selector = $el.parents(':not(html,body)')
.map(function() {
var parentIndex = $(this).index();
return this.tagName + _getChildSelector(parentIndex);
})
.get()
.reverse()
.join(' ');
if (selector) {
// get node name from the element itself
selector += ' ' + $el[0].nodeName +
// get child selector from element ifself
_getChildSelector($el.index());
}
selector += _getIdAndClassNames($el);
return selector;
}
$.ajax({ url : "ajax_invite_load.php",
async : true,
type : 'POST',
data : ...
dataType : 'html',
success : function(html, statut) {
var focus = $(document.activeElement).getSelector();
$td_left.html(html);
$(focus).focus();
}
});
我只需要把你的函数封装在一个 jQuery 插件中:
!(function ($, undefined) {
$.fn.getSelector = function () {
if (!this || !this.length) {
return ;
}
function _getChildSelector(index) {
if (typeof index === 'undefined') {
return '';
}
index = index + 1;
return ':nth-child(' + index + ')';
}
function _getIdAndClassNames($el) {
var selector = '';
// attach id if exists
var elId = $el.attr('id');
if(elId){
selector += '#' + elId;
}
// attach class names if exists
var classNames = $el.attr('class');
if(classNames){
selector += '.' + classNames.replace(/^\s+|\s+$/g, '').replace(/\s/gi, '.');
}
return selector;
}
// get all parents siblings index and element's tag name,
// except html and body elements
var selector = this.parents(':not(html,body)')
.map(function() {
var parentIndex = $(this).index();
return this.tagName + _getChildSelector(parentIndex);
})
.get()
.reverse()
.join(' ');
if (selector) {
// get node name from the element itself
selector += ' ' + this[0].nodeName +
// get child selector from element ifself
_getChildSelector(this.index());
}
selector += _getIdAndClassNames(this);
return selector;
}
})(window.jQuery);