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Detailed explanation of JavaScript modification of css local and global style code

Jul 19, 2017 pm 04:32 PM

css javascript

Modifying css style style is quite practical in some cases. You can dynamically change some styles. Next, I will introduce how to do it using JavaScript

1. Partially change the style
There are three types: changing direct style, changing className and changing cssText. What needs to be noted is:
Pay attention to capitalization:
Javascript is very sensitive to capitalization. ClassName cannot write "N" as "n", and cssText cannot write "T" as "t", otherwise it cannot be implemented. Effect.
Calling method:
If you change className, declare the class in the style sheet in advance, but do not follow style when calling, like document.getElementById('obj').style.className=”…” Incorrect! It can only be written as: document.getElementById('obj').className="..."
Change cssText
But if you use cssText, you must add style. The correct way to write it is: document.getElementById('obj') .style.cssText=”…”

I don’t need to talk about changing the direct style. Remember to write the specific style, such as

document.getElementById(&#39;obj&#39;).style.backgroundColor=”#003366″

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2. Globally change the style
Usually In this case, we can achieve real-time switching of web page styles by changing the href value of the external link style, that is, "changing the template style". At this time, we first need to give an id to the target that needs to be changed, such as

&lt;link rel = &quot;stylesheet&quot; type=&quot;text/css&quot; id=&quot;css&quot; href=&quot;firefox.css&quot; /&gt;

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. It is very simple to call, such as

&lt;span on click=&quot;javascript:document.getElementById(&#39;css&#39;).href = &#39;ie.css&#39;&quot;&gt;点我改变样式&lt;/span&gt;

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. Newcomers often do not know that the specific CSS style is in javascript. How to write it, and sometimes the requirements are different in different browsers. For example, float is written as styleFloat in IE and cssFloat in FIREFOX, which requires everyone's accumulation. Searching "ccvita javascript" in Google may help your doubts.

Basic knowledge

There are usually three ways to call style sheets in web pages.
First method: Linking to an external style sheet file (Linking to a Style Sheet)
You can create an external style sheet file (.css) first, and then use the HTML link object. An example is as follows:

&lt;head&gt; 
&lt;title&gt;文档标题&lt;/title&gt; 
&lt;link rel=stylesheet href=&quot;http://demo.css&quot; type=&quot;text/css&quot;&gt; 
&lt;/link&gt;&lt;/head&gt;

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In XML, you should add it in the declaration area as shown in the following example:

&lt; ? xml-stylesheet type=&quot;text/css&quot; href=&quot;http://dhtmlet.css&quot; ?&gt;

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Second: Define an internal style block object (Embedding a Style Block)
You can insert a

block object between the and tags in your HTML document. For definition methods, please refer to style sheet syntax. An example is as follows:

&lt;html&gt; 
&lt;head&gt; 
&lt;title&gt;文档标题&lt;/title&gt; 
&lt;style type=&quot;text/css&quot;&gt; 
&lt;!-- 
body {font: 10pt &quot;Arial&quot;} 
h1 {font: 15pt/17pt &quot;Arial&quot;; font-weight: bold; color: maroon} 
h2 {font: 13pt/15pt &quot;Arial&quot;; font-weight: bold; color: blue} 
p {font: 10pt/12pt &quot;Arial&quot;; color: black} 
--&gt; 
&lt;/style&gt; 
&lt;/head&gt; 
&lt;body&gt; 
&lt;/body&gt;&lt;/html&gt;

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Please note that setting the type attribute of the style object to "text/css" here allows browsers that do not support this type to ignore the style sheet.
Third type: Inline Definition (Inline Styles)
Inline definition is to use the object's style attribute within the object's tag to define the style sheet attributes that apply to it. Examples are as follows:

&lt;p style=&quot;margin-left: 0.5in; margin-right:0.5in&quot;&gt;这一行被增加了左右的外补丁&lt;/p&gt;&lt;p&gt; &lt;/p&gt;

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