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CSS + jquery responsive background color changes

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[前端(javascript) 所属分类 前端(javascript) | 发布者 店小二04 | 时间 2018 | 作者 红领巾 ] 0人收藏点击收藏

The goal I'd like to achieve is that, if the window size is greater than 400, the #box2 color changes to black (when onhover on #box1 ), if smaller than 400, #box2 color changes to yellow.

I thought I finished this task, however I found I always need to refresh the page to see the effects. the jQuery doesn't work immediately once the window size changes.

Do I need to use ajax or something to make the jQuery responsive to work?

Online Sample: http://jsfiddle.net/dFbXr/

here is my code

HTML: <div id="box1"> <div id="box2"></div> </div> jQuery: function colorchange(){ if($(window).width() > 400){ $("#box1").mouseover(function(){ $("#box2").css('background','black'); }).mouseout(function(){ $("#box2").css('background','blue'); }); }else{ $("#box1").mouseover(function(){ $("#box2").css('background','yellow'); }).mouseout(function(){ $("#box2").css('background','blue'); }); } } colorchange(); CSS: #box1{ display: block; background:red; background-size: 100%; position: relative; padding-bottom: 60%; } #box2{ display:block; background:blue; position:absolute; height:70px; width:70px; right:50%; top:50%; margin: -35px -35px 0 0; }

Problem courtesy of: olo

Solution

You need to call your colorchange() function both when the page first loads and when the window is resized. There is a "resize" event that you can handle with code like this:

$(window).on("resize",colorchange);

Note that colorchange is passed as a parameter to the .on() function without parentheses, i.e., colorchange not colorchange() . Without parens passes a reference to the function, with parens calls the function immediately and passes its result.

Demo: http://jsfiddle.net/dFbXr/1/

You mentioned Ajax, but Ajax is totally unrelated to the problem at hand: it is for sending and/or receiving data from the web server without reloading the whole page.

Solution courtesy of: nnnnnn

Discussion

You're only calling the colorchange() function once--you need to call it again any time the window is resized, otherwise it will only have gone through your if-else once.

You need to add this jQuery to your code:

$(window).on("resize",colorchange);

Discussion courtesy of: uptownnickbrown

If you're only supporting CSS3 browsers and don't want to rely on javascript, you could use media query to achieve the same thing, by changing the effect of the :hover by screen size.

Here's a quick example: http://jsfiddle.net/dFbXr/2/

Discussion courtesy of: Gary Stevens

This recipe can be found in it's original form on Stack Over Flow .

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主题: CSSjQueryAjaxJavaScriptHTMLJavaCSS3
tags: function,background,window,colorchange,need,#box2,gt,You,changes,jQuery
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