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Javascript Dynamic Setting style instance analysis

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Javascript Dynamic Setting style instance analysis

This article describes how to dynamically set styles in javascript. Share it with you for your reference. The specific analysis is as follows:

Dynamic style Modification

1. Easy to error: modifying the style of an element is not a class attribute, but a className attribute.

2. Easy to troubleshoot: Use "style. attribute name" to modify the style attributes separately. Note that the attribute name in css is in javascript.

During the operation, the attribute names may be different, mainly in those attributes that contain-, because

In javascript-it cannot be an attribute or a class name. In CSS, the background color is background-clolor, while in javascript, the background color is style. background; the element style name is class, which is the className attribute in javascript; font-size-> style. fontSize; margin-top-> style. marginTop

3. Modify the style of the Control <input type = "button" value = "AAA" onclick = "this. style. color = 'red'"/>

1. Example 1

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<Html xmlns = "http://www.w3.org/1999/xhtml">

<Head>

<Title> dynamically modify a style </title>

<Style type = "text/css">

. Day

{

Background-color: Green;

}

. Night

{

Background-color: Black;

}

</Style>

<Script type = "text/javascript">

Function dayclick (){

Var divMain = document. getElementById ("divMain ");

// Note that className is used instead of class.

DivMain. className = "day ";

}

Function nightclick (){

Var divMain = document. getElementById ("divMain ");

DivMain. className = "night ";

}

</Script>

</Head>

<Body>

<Div id = "divMain" class = "day">

<Font color = "red"> People's Republic of China </font>

</Div>

<Input type = "button" value = "Daytime" onclick = "dayclick ()"/>

<Input type = "button" value = "" onclick = "nightclick ()"/>

</Body>

</Html>

2. Example: dynamically modify the style (simulate opening and turning off the light)

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<Html xmlns = "http://www.w3.org/1999/xhtml">

<Head>

<Title> </title>

<Style type = "text/css">

. Day

{

Background-color: White;

}

. Night

{

Background-color: Black;

}

</Style>

<Script type = "text/javascript">

Function switchLight (){

Var btnSwitch = document. getElementById ("btnSwitch ");

If (document. body. className = "day "){

Document. body. className = "night ";

BtnSwitch. value = "turn on the light ";

}

Else {

Document. body. className = "day ";

BtnSwitch. value = "turn off the light ";

}

}

</Script>

</Head>

<Body class = "night">

<Input type = "button" value = "turn on" id = "btnSwitch" onclick = "switchLight ()"/>

</Body>

</Html>

3. Example:

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<Html xmlns = "http://www.w3.org/1999/xhtml">

<Head>

<Title> dynamically set the style exercise (modify the background color of the text box) </title>

<Script type = "text/javascript">

Function IniEvents (){

Var inputs = document. getElementsByTagName ("input ");

For (var I = 0; I <inputs. length; I ++ ){

If (inputs [I]. type = "text "){

// Set the txtOnBlur function as the onblur Event Response Function of the input element

Inputs [I]. onblur = txtOnBlur;

}

}

}

Function txtOnBlur (){

/*

TxtOnBlur is the onblur response function, not called by the response function.

All the objects that can use this to obtain the event control.

*/

If (this. value. length <= 0 ){

This. style. background = "red ";

}

Else {

This. style. background = "white ";

}

}

</Script>

</Head>

<Body onload = "IniEvents ()">

<Input type = "text"/> <br/>

<Input type = "text"/> <br/>

<Input type = "text"/> <br/>

<Input type = "text"/> <br/>

<Input type = "text"/> <br/>

<Input type = "text"/> <br/>

</Body>

</Html>

I hope this article will help you design javascript programs.

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
coverity dynamic analysis javascript if else style javascript style tag style opacity javascript dynamic dropdown javascript dynamic class name javascript javascript dynamic variables
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