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1<!DOCTYPE html><html lang="de"><head> <meta charset="utf-8" /> <title>Math.round()</title> <!-- function zum Runden von Zahlen --> <link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons"> <link rel="icon" type="image/svg+xml" href="../img/favicon.svg" sizes="any"> <style> * { padding:0; margin:0; } body { padding:2.75em 3em; font: 12pt verdana,georgia,arial,sans-serif; } h2 { font: bold 20pt verdana,sans-serif !important; } form { font: 12pt verdana,sans-serif !important; padding:10pt 0; } p { padding:6pt 0 !important; margin-top:10pt; } .result, .raw, .runden { width: 150pt !important; padding:5pt 5pt !important; font: 11pt verdana,sans-serif !important; } .result { font-size:12pt !important; margin-top:2px !important; padding:8px 4px 8px 8px !important; border:2px solid gray; border-radius:3pt; box-shadow:2pt 2pt 3pt crimson; } .raw { border:2px solid gray; border-radius:3pt; } .runden { width: 160pt !important; } </style> <script> function round(wert, dez) { wert = parseFloat(wert); if (!wert) return 0; dez = parseInt(dez); if (!dez) dez=0; var umrechnungsfaktor = Math.pow(10, dez); var multi = Math.round(wert * umrechnungsfaktor); var res = multi / umrechnungsfaktor; /*** Control in der Console ***/ console.log(umrechnungsfaktor); console.log(multi); console.log(dez); if(umrechnungsfaktor == '0.00001') { res = Math.round(res); console.log(res); } return res; } /*** Beispiel **************************************************** zahl = 8175.4647693075; gerundet = round(zahl, 3); //auf drei Stellen runden = 8175.465 *****************************************************************/ function ausgabe(wert, dez) { valeur = wert.replace(',', '.'); valore = valeur.replace(/'/g, ''); //console.log(valore); index(valore); var result = 0; result = round(valore, dez); document.getElementById('res').innerHTML=result; hideres(wert, dez); } function index(valore) { var l = valore.length; // alle Dezimalstellen (plus Kommata/Punkt) var n = valore.indexOf("."); // Position Komma/Punkt, wenn keiner n = -1 var k = ((l-n)-2); // Differenz von l und n minus Punkt und letzter Stelle (-2) //numinfo(l,n,k); error(n,l); if(n != -1) { while(k >0) { console.log(k); document.getElementById(k).style.display='flex'; k--; } n--; while(n >=0) { console.log(n); document.getElementById('p'+n).style.display='flex'; n--; } } else { l--; while(l >=0) { console.log(l); document.getElementById('p'+l).style.display='flex'; l--; } } } function error(n, l) { if((n == -1 && l >7) || (n != -1 && n >7)) { errormsg(); } if(((l-n)-1) >7) { errormsg2(); } } function errormsg() { document.write('<html style="padding:0; margin:0;"><body style="padding:2.5em 3em;"><h1 style="font:bold 20pt verdana,sans-serif; color:crimson;">♣ Zahl zu gross ♦ max. 9 Millionen ♠</h1><button style="padding:5pt 10pt; margin-top:1em; border-radius:5px; font:bold 11pt verdana,sans-serif; border:2pt solid black; background:white;" onclick="location.href=\'http://www.michaelster.ch/jsTestFolder/math.round.htm\';">verstanden</button></body></html>'); } function errormsg2() { document.write('<html style="padding:0; margin:0;"><body style="padding:2.5em 3em;"><h1 style="font:bold 20pt verdana,sans-serif; color:crimson;">♦ Zu lange Zahl ♣ max. 7 Dezimalstellen ♠</h1><button style="padding:5pt 10pt; margin-top:1em; border-radius:5px; font:bold 11pt verdana,sans-serif; border:2pt solid black; background:white;" onclick="location.href=\'http://www.michaelster.ch/jsTestFolder/math.round.htm\';">verstanden</button></body></html>'); } function numinfo(l,n,k) { document.getElementById("interg").innerHTML = n + " :: " + l + " :: " + k; } function hideres(wert, dez) { if(wert && dez) { document.getElementById('interg').style.display='flex'; document.getElementById('res').style.display='flex'; } else { document.getElementById('interg').style.display='none'; document.getElementById('res').style.display='none'; } } </script></head><body onload="document.getElementById('f0').elements['rawnumber'].value='';"> <h2>Math.round()</h2> <form name="f0" id="f0"> <p>Zahl:</p> <input type="text" id="zahl" name="rawnumber" placeholder="Bitte hier eingeben" onblur="ausgabe(this.value);" title="Kein Komma, nur Punkt" size="15" maxlength="15" class="raw" value="" autofocus /> <p>runden auf:</p> <select name="selround" class="runden" size="1" id="sel_id" onchange="ausgabe(document.getElementById('f0').elements['rawnumber'].value, this.value);"> <option value="">Bitte wählen </option> <option value="">- <> - <> - <> - <> - <> - <> - <> - </option> <option style="display:none" id="6" value="6"> • millionstel</option> <option style="display:none" id="5" value="5"> • hunderttausendstel</option> <option style="display:none" id="4" value="4"> • zehntausendstel</option> <option style="display:none" id="3" value="3"> • tausendstel</option> <option style="display:none" id="2" value="2"> • hundertstel</option> <option style="display:none" id="1" value="1"> • zehntel</option> <option style="display:none" id="p0" value="0"> ¤ Einer</option> <option style="display:none" id="p1" value="-1"> ¤ Zehner</option> <option style="display:none" id="p2" value="-2"> ¤ Hunderter</option> <option style="display:none" id="p3" value="-3"> ¤ Tausender</option> <option style="display:none" id="p4" value="-4"> ¤ Zehntausender</option> <option style="display:none" id="p5" value="-5"> ¤ Hunderttausender</option> <option style="display:none" id="p6" value="-6"> ¤ Millionen</option> <option> </option> </select> <p style="display:none" id="interg" class="interg"> <b>Resultat:</b> </p> <div style="display:none" class="result" id="res"></div> </form></body></html>