This is a little example about a JavaScript Calculator, he could calculate some simple things another solution is to use eval.
JavaScript code:
HTML code:
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var Wert = 0; var OP = ":"; function CalcPlus () { if(document.Eingabe.TB.value != ""&&OP!=":"){CalcErg();} switch(OP) { case "+": document.Eingabe.TB.value = 1*Wert+1*document.Eingabe.TB.value;document.Eingabe.TB.value="";OP=":"; break; case "-": document.Eingabe.TB.value = Wert-document.Eingabe.TB.value;document.Eingabe.TB.value="";OP=":"; break; case "*": document.Eingabe.TB.value = Wert*document.Eingabe.TB.value;document.Eingabe.TB.value="";OP=":"; break; case "/": document.Eingabe.TB.value = Wert/document.Eingabe.TB.value;document.Eingabe.TB.value="";OP=":"; break; default: Wert = document.Eingabe.TB.value; document.Eingabe.TB.value=""; } OP="+"; } function CalcMinus () { if(document.Eingabe.TB.value != ""&&OP!=":"){CalcErg();} switch(OP) { case "+": document.Eingabe.TB.value = 1*Wert+1*document.Eingabe.TB.value;document.Eingabe.TB.value="";OP=":"; break; case "-": document.Eingabe.TB.value = Wert-document.Eingabe.TB.value;document.Eingabe.TB.value="";OP=":"; break; case "*": document.Eingabe.TB.value = Wert*document.Eingabe.TB.value;document.Eingabe.TB.value="";OP=":"; break; case "/": document.Eingabe.TB.value = Wert/document.Eingabe.TB.value;document.Eingabe.TB.value="";OP=":"; break; default: Wert = document.Eingabe.TB.value; document.Eingabe.TB.value=""; } OP="-"; } function CalcMal () { if(document.Eingabe.TB.value != ""&&OP!=":"){CalcErg();} switch(OP) { case "+": document.Eingabe.TB.value = 1*Wert+1*document.Eingabe.TB.value;document.Eingabe.TB.value="";OP=":"; break; case "-": document.Eingabe.TB.value = Wert-document.Eingabe.TB.value;document.Eingabe.TB.value="";OP=":"; break; case "*": document.Eingabe.TB.value = Wert*document.Eingabe.TB.value;document.Eingabe.TB.value="";OP=":"; break; case "/": document.Eingabe.TB.value = Wert/document.Eingabe.TB.value;document.Eingabe.TB.value="";OP=":"; break; default: Wert = document.Eingabe.TB.value; document.Eingabe.TB.value=""; } OP="*"; } function CalcDiv () { if(document.Eingabe.TB.value != ""&&OP!=":"){CalcErg();} switch(OP) { case "+": document.Eingabe.TB.value = 1*Wert+1*document.Eingabe.TB.value;document.Eingabe.TB.value="";OP=":"; break; case "-": document.Eingabe.TB.value = Wert-document.Eingabe.TB.value;document.Eingabe.TB.value="";OP=":"; break; case "*": document.Eingabe.TB.value = Wert*document.Eingabe.TB.value;document.Eingabe.TB.value="";OP=":"; break; case "/": document.Eingabe.TB.value = Wert/document.Eingabe.TB.value;document.Eingabe.TB.value="";OP=":"; break; default: Wert = document.Eingabe.TB.value; document.Eingabe.TB.value=""; } OP="/"; } function CalcErg () { switch(OP) { case "+": document.Eingabe.TB.value = 1*Wert+1*document.Eingabe.TB.value; break; case "-": document.Eingabe.TB.value = Wert-document.Eingabe.TB.value; break; case "*": document.Eingabe.TB.value = Wert*document.Eingabe.TB.value; break; case "/": document.Eingabe.TB.value = Wert/document.Eingabe.TB.value; break; default: document.Eingabe.TB.value=Wert; } OP=":"; Wert=document.Eingabe.TB.value; } function CalcClear () { document.Eingabe.TB.value ="";OP=":";Wert=0; } |
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<form name="Eingabe"> <input type="text" name="TB"> <br> <input type="button" onclick="javascript:CalcPlus()" value="+"> <input type="button" onclick="javascript:CalcMinus()" value="-"> <input type="button" onclick="javascript:CalcMal()" value="*"> <input type="button" onclick="javascript:CalcDiv()" value="/"> <input type="button" onclick="javascript:CalcErg()" value="="> <br> <input type="button" onclick="document.Eingabe.TB.value=Math.sqrt(document.Eingabe.TB.value)" value="sqrt"> <input type="button" onclick="document.Eingabe.TB.value=Math.sin(document.Eingabe.TB.value)" value="sin"> <input type="button" onclick="document.Eingabe.TB.value=Math.cos(document.Eingabe.TB.value)" value="cos"> <input type="button" onclick="document.Eingabe.TB.value=Math.tan(document.Eingabe.TB.value)" value="tan"> <br> <input type="button" onclick="document.Eingabe.TB.value=1/document.Eingabe.TB.value" value="1/x"> <input type="button" onclick="document.Eingabe.TB.value=document.Eingabe.TB.value*1e3" value="x*1k"> <input type="button" onclick="document.Eingabe.TB.value=document.Eingabe.TB.value*1e-3" value="x*1m"> <input type="button" onclick="document.Eingabe.TB.value=Math.PI" value="Pi"> <br> <input type="button" onclick="javascript:CalcClear()" value=" --< Clear >-- "> <br> </form> |
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