在jquery插件中获取初始选择器 [英] Getting initial selector inside jquery plugin

问题描述

我之前得到了一些关于选择器的帮助，但我坚持以下。

I got some help earlier regarding selectors, but I'm stuck with the following.

假设你有这样的插件

$('#box').customplugin();

如何在插件中将#box作为字符串？
不确定这是否是正确的做法，任何其他解决方案都会很棒。

how can I get the #box as a string in the plugin? Not sure if that's the correct way of doing it, and any other solution would be great as well.

考虑到#box是一个选择下拉列表，

Considering #box is a select dropdown,

我遇到的问题是如果我做普通的javascript

The problem I'm having is if I do the regular javascript

$('#box').val(x);

选择了正确的选项值，

但如果我在插件中尝试相同的

but if i try the same inside a plugin

.....
this.each(function() {
var $this = $(this);


$this.val(x);

最后一个代码并没有真正做任何事情。

the last code doesn't really do anything.

我注意到我在定位#box里面遇到了麻烦插件，因为它是一个对象，而不是一个字符串......

I notice I'm having trouble targeting #box inside the plugin because it's a object and not a string...

任何帮助都将不胜感激。

Any help would be appreciated.

谢谢！

:输入我正在努力的代码以便更好地理解

: Putting in the code I'm working in for better understanding

(function($){
$.fn.customSelect = function(options) {
    var defaults = {
        myClass : 'mySelect'
    };
    var settings = $.extend({}, defaults, options);


    this.each(function() {
        // Var          
        var $this = $(this);
        var thisOpts = $('option',$this);
        var thisSelected = $this[0].selectedIndex;
        var options_clone = '';

        $this.hide();

        options_clone += '<li rel=""><span>'+thisOpts[thisSelected].text+'</span><ul>'
        for (var index in thisOpts) {
            //Check to see if option has any text, and that the value is not undefined
            if(thisOpts[index].text && thisOpts[index].value != undefined) {
                options_clone += '<li rel="' + thisOpts[index].value + '"><span>' + thisOpts[index].text + '</span></li>'
            }
        }
        options_clone += '</ul></li>';

        var mySelect = $('<ul class="' + settings.myClass + '">').html(options_clone); //Insert Clone Options into Container UL
        $this.after(mySelect); //Insert Clone after Original

        var selectWidth = $this.next('ul').find('ul').outerWidth(); //Get width of dropdown before hiding
        $this.next('ul').find('ul').hide(); //Hide dropdown portion

        $this.next('ul').css('width',selectWidth);

        //on click, show dropdown
        $this.next('ul').find('span').first().click(function(){
            $this.next('ul').find('ul').toggle();
        });

        //on click, change top value, select hidden form, close dropdown
        $this.next('ul').find('ul span').click(function(){
            $(this).closest('ul').children().removeClass('selected');
            $(this).parent().addClass("selected");
            selection = $(this).parent().attr('rel');
            selectedText = $(this).text();
            $(this).closest('ul').prev().html(selectedText);
            $this.val(selection); //This is what i can't get to work
            $(this).closest('ul').hide();
        });

    });
    // returns the jQuery object to allow for chainability.
    return this;
}

推荐答案

**编辑**克雷格打败我** /编辑**

** edit ** Craig beat me to it ** /edit **

**编辑**
只是一个单挑：.selector（）在jQuery 1.7中被弃用了在jQuery 1.9中删除： api.jquery.com/selector 。
- Simon Steinberger
** / edit **

** edit ** Just a heads-up: .selector() is deprecated in jQuery 1.7 and removed in jQuery 1.9: api.jquery.com/selector. – Simon Steinberger ** /edit **

使用 .selector 属性在jQuery集合上。

Use the .selector property on a jQuery collection.

var x = $( "#box" );
alert( x.selector ); // #box

在你的插件中：

$.fn.somePlugin = function() {

    alert( this.selector ); // alerts current selector (#box )

    var $this = $( this );

    // will be undefined since it's a new jQuery collection
    // that has not been queried from the DOM.
    // In other words, the new jQuery object does not copy .selector
    alert( $this.selector );
}

然而，以下内容可能解决了您的真实问题？

However this following probably solves your real question?

$.fn.customPlugin = function() {
    // .val() already performs an .each internally, most jQuery methods do.
    // replace x with real value.
    this.val(x);
}

$("#box").customPlugin();

这篇关于在jquery插件中获取初始选择器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！