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Border color changes when the focus of the text box in JavaScript

Source: Internet
Author: User
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Example

The code is as follows: Copy code

Function appendit ()
  { 
Var nodes = document. getElementsByTagName ("INPUT ");
For (var I = 0; I <nodes. length; I ++)
  { 
Var ctype = nodes [I]. getAttribute ("type ");
If (ctype = 'text ')
  { 
Nodes [I]. onfocus = function () {this. style. backgroundColor = '#33ff00 ';}
Nodes [I]. onblur = function () {this. style. backgroundColor = '# 3366FF ';}
  } 
  } 
  } 

Test:

<Input type = "text" size = "36" name = "title"/>


Let's look at another example.

Click the border color-changing text box. When you click the text box to be entered, the text box will automatically color-changing and highlighted, which has a very visual effect, making the text box much more beautiful.

The code is as follows: Copy code

<! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<Html xmlns = "http://www.w3.org/1999/xhtml">
<Head>
<Meta http-equiv = "Content-Type" content = "textml; charset = utf-8"/>
<Title> border color change when you click in the input box </title>
</Head>
<Body>
<Script type = "text/javascript">
// FocusClass: the style when the focus is obtained
// NormalClass: normal style
Function focusInput (focusClass, normalClass ){
Var elements = document. getElementsByTagName ("input ");
For (var I = 0; I <elements. length; I ++ ){
If (elements [I]. type! = "Button" & elements [I]. type! = "Submit" & elements [I]. type! = "Reset "){
Elements [I]. onfocus = function () {this. className = focusClass ;};
Elements [I]. onblur = function () {this. className = normalClass | '';};
        }
    }
}
</Script>
<Script type = "text/javascript">
Window. onload = function (){
FocusInput ('focusinput', 'normalinput ');
}
</Script>
Enter the name: <input type = "text" class = "normalInput"/>
<Style type = "text/css">
. NormalInput {border: 1px solid # ccc ;}
. FocusInput {border: 1px solid # FFD42C ;}
</Style>
</Body>
</Html>

It works in Firefox, but Firefox and chrome. By default, these two browsers will automatically input a box to add the Click effect, so sometimes they cannot see clearly, and IE is outstanding.


Introduce the popular jquery-based implementation method as an example.

The code is as follows: Copy code

Html code:

<Div class = "fun">

<H1> text box focus clear default value border color, leave focus add default value

<Div class = "text">

<Input type = "text" class = "inputText" value = "2222"/>

<Input type = "text" class = "inputText" value = "2222"/>

<Input type = "text" class = "inputText ss" value = "82747"/>

<Input type = "text" class = "inputText" value = "094727"/>

<Input type = "text" class = "inputText" value = "249049"/>

<Input type = "text" class = "inputText" value = "333"/>

<Input type = "text" class = "inputText" value = "82747"/>

</Div>

</Div>

Css code

:

This is based on the jquery library. Please add it yourself.

The code is as follows: Copy code

<Style type = "text/css">

. Fun {margin: 0 auto; width: 1000px; overflow: hidden; box-shadow: 0 3px 6px rgba (0,0, 0, 0.1); border: solid 1px # ccc; font-family: Microsoft YaHei; overflow: hidden ;}

. InputText {border: solid 1px # ccc; height: 40px; width: 200px; line-height: 40px/9; padding: 0 2px; box-shadow: inset 0 0 4px rgba (0, 0, 0.1); margin: 10px 0; outline: none; font-family: arial; font-weight: 700; text-indent: 5px; color: # 1C1C1C; display: inline-block ;}

. InputText: focus {border: solid 1px # 1398FF; box-shadow: 0 0 5px rgba (0,192,255, 0.4 );}

. Text {padding: 15px 0 15px 75px ;}

H1 {text-align: center; padding: 10px 0; margin: 0; background:-webkit-linear-gradient (# fcfcfc, # f9f9f9) repeat; background: -moz-linear-gradient (# fcfcfc, # f9f9f9) repeat; border-bottom: solid 1px # ccc; font-weight: 400; text-shadow: 1px 1px 3px # fff;}/* Css3 background gradient */

</Style>

Js code:

<Script type = "text/javascript">

// JavaScript Document

$ (Document). ready (function (){

Function input ()

{

// Use each to traverse the text box

$ (". InputText"). each (function (){

Var $ val = this. value; // Save the value of the current text box

Var $ ss = $ (". ss"). val ();

$ (This). focus (function (){

// When the focus is obtained, if the value is the default value, the value of the text box is cleared.

If (this. value = $ val ){

This. value = "";

}

});

$ (This). blur (function (){

// If the value is null when the focus is lost, the default value of the text box is added.

If (this. value = ""){

This. value = $ val;

}

});

});

}

Input ();

})

</Script>

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