js百分比实现文本框限制输入字数总数

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js百分比实现文本框限制输入字数总数

2016-11-13 网页编程网 网页编程网

<style type="text/css">
.progress{
 width: 1px;
 height: 14px;
 color: white;
 font-size: 12px;
    overflow: hidden;
 background-color: navy;
 padding-left: 5px;
}
</style>
<script>
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>提示您限制字数为：10字节</P>
<form>
<input name="maxcharfield" id="maxcharfield" onKeyDown="textCounter(this,'progressbar1',10)" onKeyUp="textCounter(this,'progressbar1',10)" onPaste="textCounter(this,'progressbar1',10)" onFocus="textCounter(this,'progressbar1',10)" /><br />
<div id="progressbar1" class="progress"></div>
<script>textCounter(document.getElementById("maxcharfield"),"progressbar1",10)</script>
</form>

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