Full version: jsB@nk » Calculation » Calculator » JavaScript Calculator
URL: https://www.javascriptbank.com/javascript-calculator.html
This is a very simple calculator, all done with javascript. Just click the numbers and the operators and use the '=' button to calculate! This is a neat example of the LIMITLESS powers of JavaScript.
Full version: jsB@nk » Calculation » Calculator » JavaScript Calculator
URL: https://www.javascriptbank.com/javascript-calculator.html
<style type="text/css">.bttnop {width:50px;color:darkred;}.bttn {width:50px;color:navy;}.answer {text-align:right;}body{background-color:white;font-size:10pt;color:black;font-family:sans-serif;}</style><!-- This script downloaded from www.JavaScriptBank.com Come to view and download over 2000+ free javascript at www.JavaScriptBank.com--><script language="javascript">var num1='';var num2='';var num1set=false;var operation='';var inmem='';var w3c=(document.getElementById)?true:false;var ns4=(document.layers)?true:false;var ns6=(w3c && navigator.appName.indexOf("Netscape")>=0)?true:false;var whichkey;function setnum(num){if((document.f.answer.value!='')&&num1set)document.f.answer.value='';if(num1set){num2+=num;document.f.answer.value=num2;}else{num1+=num;document.f.answer.value=num1;}}function docalc(optionaloper){if(optionaloper=='')num2=document.f.answer.value;if((num1!='')&&(num2!='')&&(operation!='')){document.f.answer.value=eval(num1+operation+num2);if(optionaloper==''){num1='';num2='';num1set=false;}else{num1=document.f.answer.value;num1set=true;num2='';}operation=optionaloper;}}function setoper(oper){if(num1set&&(document.f.answer.value!='')&&(num2==''))operation=oper;if(num1set&&(operation!='')&&(num2!=''))docalc(oper);if(!num1set){operation=oper;num1=document.f.answer.value;num1set=true;}}function backsp(){if(document.f.answer.value.length>=1){document.f.answer.value=document.f.answer.value.substring(0,document.f.answer.value.length-1);if(num1set) num2=document.f.answer.value;else num1=document.f.answer.value;}}function testdot(){if(num1set) if(num2.indexOf('.')==(-1))setnum('.');else if(num1.indexOf('.')==(-1))setnum('.');}function memory(b){switch(b){case 0: inmem='';document.f.box.checked=false;break;case 1:if(document.f.box.checked==true)document.f.answer.value=inmem;break;case 2: inmem=parseFloat(document.f.answer.value);document.f.box.checked=true;break;case 3: if(inmem==''){inmem=document.f.answer.value;document.f.box.checked=true;}else inmem+=parseFloat(document.f.answer.value);break;}}function clearall(yes){if(yes){num1='';num2='';num1set=false;operation='';}else num2='';document.f.answer.value=num1;}function negate(){if(num1set){if(num2!=''){num2=-num2;document.f.answer.value=num2;}}else{if(num1!=''){num1=-num1;document.f.answer.value=num1;}}}function percent(){if((num1!='')&&(num2!='')){num2=''+((parseFloat(num2))/100*parseFloat(num1));document.f.answer.value=num2;}}function squareroot(){if(num1set){if(num2!=''){num2=''+Math.sqrt(parseFloat(num2));document.f.answer.value=num2;}}else{if(num1!=''){num1=''+Math.sqrt(parseFloat(num1));document.f.answer.value=num1;}}}function invert(){if(num1set){if(num2!=''){num2=''+1/parseFloat(num2);document.f.answer.value=num2;}}else{if(num1!=''){num1=''+1/parseFloat(num1);document.f.answer.value=num1;}}}function checkbx(){(inmem!='')? document.f.box.checked=true: document.f.box.checked=false;alert('Do not click here.\n\nThis is to show if you have something in memory.');document.f.box.blur();}function showkeypress(keypress){if(!(ns4||ns6))whichkey=event.keyCode;else whichkey=keypress.which;if((whichkey>=48)&&(whichkey<=57)){whichkey=whichkey-48;setnum(whichkey.toString());}else{switch(whichkey){case 27: clearall(true);break;case 13: docalc('');break;case 42: setoper('*'); break;case 45: setoper('-');break;case 43: setoper('+'); break;case 47: setoper('/');break;case 46: testdot(); break;}}}if(ns4){window.captureEvents(Event.KEYPRESS);window.onkeypress=showkeypress;}else document.onkeypress=showkeypress;</script><!-- This script downloaded from www.JavaScriptBank.com Come to view and download over 2000+ free javascript at www.JavaScriptBank.com--><form name="f"><table cellspacing="0" cellpadding="6" border="0" bgcolor="#006bae"><tr><td align="center" colspan="6"><input type="text" class="answer" size="30" name="answer"></td></tr><tr><td align="center" colspan="6"><input type="checkbox" onClick="checkbx()" name="box" value="ON"> Mem <input type="button" value="Backspace" onClick="this.blur(); backsp()"> <input type="button" value=" CE " onClick="this.blur(); clearall(false)"> <input type="button" value=" C " onClick="this.blur(); clearall(true)"></td></tr><tr><td align="center"><input type="button" class="bttnop" value=" MC " onClick="this.blur(); memory(0)"></td><td align="center"><input type="button" class="bttn" value=" 7 " onClick="this.blur(); setnum('7')"></td><td align="center"><input type="button" class="bttn" value=" 8 " onClick="this.blur(); setnum('8')"></td><td align="center"><input type="button" class="bttn" value=" 9 " onClick="this.blur(); setnum('9')"></td><td align="center"><input type="button" class="bttnop" value=" / " onClick="this.blur(); setoper('/')"></td><td align="center"><input type="button" class="bttnop" value=" sqrt " onClick="this.blur(); squareroot()"></td></tr><tr><td align="center"><input type="button" class="bttnop" value=" MR " onClick="this.blur(); memory(1)"></td><td align="center"><input type="button" class="bttn" value=" 4 " onClick="this.blur(); setnum('4')"></td><td align="center"><input type="button" class="bttn" value=" 5 " onClick="this.blur(); setnum('5')"></td><td align="center"><input type="button" class="bttn" value=" 6 " onClick="this.blur(); setnum('6')"></td><td align="center"><input type="button" class="bttnop" value=" * " onClick="this.blur(); setoper('*')"></td><td align="center"><input type="button" class="bttnop" value=" % " onClick="this.blur(); percent()"></td></tr><tr><td align="center"><input type="button" class="bttnop" value=" MS " onClick="this.blur(); memory(2)"></td><td align="center"><input type="button" class="bttn" value=" 1 " onClick="this.blur(); setnum('1')"></td><td align="center"><input type="button" class="bttn" value=" 2 " onClick="this.blur(); setnum('2')"></td><td align="center"><input type="button" class="bttn" value=" 3 " onClick="this.blur(); setnum('3')"></td><td align="center"><input type="button" class="bttnop" value=" - " onClick="this.blur(); setoper('-')"></td><td align="center"><input type="button" class="bttnop" value=" 1/x " onClick="this.blur(); invert()"></td></tr><tr><td align="center"><input type="button" class="bttnop" value=" M+ " onClick="this.blur(); memory(3)"></td><td align="center"><input type="button" class="bttn" value=" 0 " onClick="this.blur(); setnum('0')"></td><td align="center"><input type="button" class="bttnop" value=" +/- " onClick="this.blur(); negate()"></td><td align="center"><input type="button" class="bttn" value=" . " onClick="this.blur(); testdot()"></td><td align="center"><input type="button" class="bttnop" value=" + " onClick="this.blur(); setoper('+')"></td><td align="center"><input type="button" class="bttnop" value=" = " onClick="this.blur(); docalc('')"></td></tr></table></form><!-- This script downloaded from www.JavaScriptBank.com Come to view and download over 2000+ free javascript at www.JavaScriptBank.com-->