[英]how to fix 'jQuery is not defined' error in jquery library?
[英]Getting 'jQuery not defined' error in my widget library
我在做什么
我正在創建一個可分發的jQuery小部件庫,該庫在HTML頁面上插入了一個錨點。
問題
在(JS的) “ MyWidget.prototype.Render”方法中,它給我以下錯誤- “未定義jQuery”。但是,在“ MyWidget.prototype.ResolveJqueryAndLoadAdditionalJsAndCss”方法中,它的工作正常。
HTML片段
<html>
<head>
<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
<a href="http://yahoo.com">Anchor - by user code</a>
<!-- Widget Script: Starts -->
<script type="text/javascript" src="widget.js" ></script>
<Script type="text/javascript">
var customWidget = new MyWidget();
customWidget.Render({ anchorText:'Hola!!!' });
</script>
<!-- Widget Script: Ends -->
</body>
</html>
JS代碼(widget.js)
var MyWidget = function() {
// Localize jQuery variable
var jQuery;
// Load jQuery if not present
if (window.jQuery === undefined || window.jQuery.fn.jquery !== '1.4.2') {
var script_tag = document.createElement('script');
script_tag.setAttribute("type","text/javascript");
script_tag.setAttribute("src", "http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js");
if (script_tag.readyState) {
script_tag.onreadystatechange = function () { // For old versions of IE
if (this.readyState == 'complete' || this.readyState == 'loaded') {
this.ResolveJqueryAndLoadAdditionalJsAndCss();
}
};
} else {
script_tag.onload = this.ResolveJqueryAndLoadAdditionalJsAndCss;
}
// Try to find the head, otherwise default to the documentElement
(document.getElementsByTagName("head")[0] || document.documentElement).appendChild(script_tag);
} else {
// The jQuery version on the window is the one we want to use
jQuery = window.jQuery;
this.ResolveJqueryAndLoadAdditionalJsAndCss();
}
};
MyWidget.prototype.ResolveJqueryAndLoadAdditionalJsAndCss = function() {
// Restore $ and window.jQuery to their previous values and store the
// new jQuery in our local jQuery variable
jQuery = window.jQuery.noConflict(true);
jQuery(document).ready(function($) {
$.when(
$.getScript( "http://www.jacklmoore.com/colorbox/jquery.colorbox.js" ),
$.Deferred(function( deferred ){
$( deferred.resolve );
})
).done(function(){ });
// Loading Custom CSS
var css_link = $("<link>", { rel: "stylesheet", type: "text/css", href: "https://raw.github.com/premasagar/cleanslate/master/cleanslate.css" });
css_link.appendTo('head');
css_link = $("<link>", { rel: "stylesheet", type: "text/css", href: "http://www.jacklmoore.com/colorbox/example4/colorbox.css" });
css_link.appendTo('head');
css_link = $("<link>", { rel: "stylesheet", type: "text/css", href: "widget.css" });
css_link.appendTo('head');
});
};
MyWidget.prototype.Render = function(data){
jQuery(document).ready(function($) {
$('<a href="http://wikipedia.com" class="cleanslate custom widgetExternalPage">' + data.anchorText + '</a>').appendTo('body');
$(".widgetExternalPage").colorbox({iframe:true, width:"80%", height:"80%"});
});
};
好吧,您正在重新定義jQuery
。 實際上,您在重新聲明任何變量也在重新設置其值。 在這里,您將jQuery
的值設置為undefined
。 您不應該這樣做。
如果需要,可以按照以下方式進行操作:
var jQuery = jQuery || undefined;
這可能會有幫助,祝您好運!
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