文本显示输入字数-白红宇

文本显示输入字数

阅读量：5042 次

发布时间：2019-06-12

本文共 1700 字，大约阅读时间需要 5 分钟。

                      
<
style
type
=
"text/css"
> 
.progress{ 
 
width: 1px; 
 
height: 14px; 
 
color: white; 
 
font-size: 12px; 
    
overflow: hidden; 
 
background-color: navy; 
 
padding-left: 5px; 
} 
</
style
> 
<
script
type
=
"text/JavaScript"
> 
function textCounter(field,counter,maxlimit,linecounter) { 
 
// text width// 
 
var fieldWidth =  parseInt(field.offsetWidth); 
 
var charcnt = field.value.length;         
 
// trim the extra text 
 
if (charcnt > maxlimit) {  
  
field.value = field.value.substring(0, maxlimit); 
 
} 
 
else {  
 
// progress bar percentage 
 
var percentage = parseInt(100 - (( maxlimit - charcnt) * 100)/maxlimit) ; 
 
document.getElementById(counter).style.width =  parseInt((fieldWidth*percentage)/100)+"px"; 
 
document.getElementById(counter).innerHTML="已输: "+percentage+"%" 
 
// color correction on style from CCFFF -> CC0000 
 
setcolor(document.getElementById(counter),percentage,"background-color"); 
 
} 
} 
function setcolor(obj,percentage,prop){ 
 
obj.style[prop] = "rgb(80%,"+(100-percentage)+"%,"+(100-percentage)+"%)"; 
} 
</
script
> 
<
p
>限制：120字节</
P
> 
<
form
> 
<
textarea
rows
=
"5"
cols
=
"40"
name
=
"maxcharfield"
id
=
"maxcharfield"
onKeyDown
=
"textCounter(this,'progressbar1',120)"
onKeyUp
=
"textCounter(this,'progressbar1',120)"
onPaste
=
"textCounter(this,'progressbar1',120)"
onFocus
=
"textCounter(this,'progressbar1',120)"
></
textarea
><
br
/> 
<
div
id
=
"progressbar1"
class
=
"progress"
></
div
> 
<
script
>textCounter(document.getElementById("maxcharfield"),"progressbar1",120)</
script
> 
</
form
></
font
> 
       
     