javascript

js implements a method to delete text effect by simulating backspace key of calculator

An example of js is presented in this paper. Share to everybody for everybody reference. The details are as follows:

<!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="text/html; charset=utf-8" />
<title> Headless document </title>
<style type="text/css">
.myinput{
width:70px; height:30px;
}
.tf{
width:220px; height:30px;
margin-bottom:5px; font-size:26px;
font-family:Tahoma, Geneva, sans-serif;
color:#fff; border:2px solid #999;
background:#000; text-align:right;
}
</style>
<script language="javascript" type="text/javascript">
window.onload = function()
{
 var tf = $("tf");
 for( var i=0;i<11;i++ ){
 $("btn"+i).onclick = function(){
  if(this.value == "." && tf.value == "") return false;
  if(this.value == "." && tf.value.indexOf(".") != -1) return false;
  if(tf.value == "0"){
  if(this.value == "."){
   tf.value += this.value;
  }
  }else{
  tf.value += this.value;
  }
 }
 }
 $("back").onclick = function(){
 tf.value = tf.value.replace(/.$/,'')
 }
}
function $(id){return document.getElementById(id);}
</script>
</head>
<body>
<input class="tf" name="textfield" type="text" id="tf" size="30" />
<br />
<input class="myinput" type="submit" name="button" id="btn0" value="0" />
<input class="myinput" type="submit" name="button" id="btn1" value="1" />
<input class="myinput" type="submit" name="button" id="btn2" value="2" />
<br />
<input class="myinput" type="submit" name="button" id="btn3" value="3" />
<input class="myinput" type="submit" name="button" id="btn4" value="4" />
<input class="myinput" type="submit" name="button" id="btn5" value="5" />
<br />
<input class="myinput" type="submit" name="button" id="btn6" value="6" />
<input class="myinput" type="submit" name="button" id="btn7" value="7" />
<input class="myinput" type="submit" name="button" id="btn8" value="8" />
<br />
<input class="myinput" type="submit" name="button" id="btn9" value="9" />
<input class="myinput" type="submit" name="button" id="btn10" value="." />
<input class="myinput" type="submit" name="button" id="back" value=" backspace " />
</body>
</html>

Hopefully, this article has been helpful in your javascript programming.