custom-selectors | 易学教程

jQuery custom selector, “undefined”

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问题 i am trying to make a jQuery ui calendar make ajax calls when a date is clicked on, but i ran into a problem a few days ago. I found a snippet of code that supposedly does this , but as i found out it uses jQuery custom selectors. The code gave me an error so i started digging into the custom selectors to find out more about them. So far i haven't been able to find out why i get this strange behavior. Here is a picture to hopefully clear things up , i will explain more after it I've typed in

What useful custom jQuery selectors have you written?

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For me, one of the best, yet under-utilised feature of jQuery is the custom selector . I have a fairly trivial example of this, to pick out all text boxes that are empty: $(document).ready(function() { $.extend($.expr[':'], { textboxEmpty: function(el) { var $el = $(el); return ($el.val() == "") && ($el.attr("type") == "text"); } }); }); And to call: alert($(":textboxEmpty").length); I was wondering, really, if anyone else had some useful examples of custom selectors they have written. I am, of course, not blind to the pitfalls of these, and realise that they can be quite slow and, as such,

What useful custom jQuery selectors have you written?

阅读更多关于 What useful custom jQuery selectors have you written?

问题 For me, one of the best, yet under-utilised feature of jQuery is the custom selector. I have a fairly trivial example of this, to pick out all text boxes that are empty: $(document).ready(function() { $.extend($.expr[':'], { textboxEmpty: function(el) { var $el = $(el); return ($el.val() == "") && ($el.attr("type") == "text"); } }); }); And to call: alert($(":textboxEmpty").length); I was wondering, really, if anyone else had some useful examples of custom selectors they have written. I am,

Android - styling seek bar

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问题 I wanted to style a seek bar which looks like the one in the image below. By using default seekbar I will get something like this: So what I need is to only change the color. I need no extra styles. Is there any straight forward approach to do this or should I build my custom drawable.? I tried building custom one, but I could not get the exact one as shown above. After using custom drawable, what I get is as shown below: If I need to build the custom one, then please suggest how to reduce