html - Express/Solve formula with Javascript -
i trying create form allow variables inputted , given formula solved. stumbling on how express formula , how make first 2 variables understood exponent.
here complete formula works in excel (cell labels replaced input names html):
=varnk * varqr * ( 273 + vart ) / ( 273 + varto ) * varpp / varp * varkq * varkak note "varnk" , "varqr" values entered exponents - i.e. 97.53^12
edit: actual formula (link image don't have enough rep post directly)- http://mattk.net/dwformula1.png
here attempted make work. wasn't sure correct way assemble final output, ideally want figure out how make single button operation.
<head> <script> function docalcone() { var varnk = document.getelementbyid('varnk').value; var varqr = document.getelementbyid('varqr').value; var vart = document.getelementbyid('vart').value; var varto = document.getelementbyid('varto').value; var varpo = document.getelementbyid('varpo').value; var varp = document.getelementbyid('varp').value; var varkq = document.getelementbyid('varkq').value; var varkak = document.getelementbyid('varkak').value; var result1 = document.getelementbyid('stepone'); var stepone = varnk * varqr; result1.value = stepone; } function docalctwo() { var result2 = document.getelementbyid('steptwo'); var steptwo = parseint(vart.value) + 273; result2.value = steptwo; } </script> </head> <html> <table> <tr> <td>step one:<input id="stepone" /></td> </tr> <tr> <td>step two:<input id="steptwo" /></td> </tr> </table> <div id="doseratecalc"> <p>enter values below calculate dose rate</p> </div> <table style="width:600px;border:1px solid #000;"> <tr> <td> <p>nk=<input id="varnk" type="text"></p> </td> <td> <p>tn 34013 ic cal certificate detection calibration factor</p> </td> <tr> <td> <p>qr=<input id="varqr" type="text"></p> </td> <td> <p>unidos measured charge in pc (pico coulumb)@20mm</p> </td> </tr> <tr> <td> <p>t=<input id="vart" type="text"></p> </td> <td> <p>current temperature</p> </td> </tr> <tr> <td> <p>to=<input id="varto" type="text"></p> </td> <td> <p>tn34013 ic cal certificate protocol temp</p> </td> </tr> <tr> <td> <p>po=<input id="varpo" type="text"></p> </td> <td> <p>current pressure</p> </td> </tr> <tr> <td> <p>p=<input id="varp" type="text"></p> </td> <td> <p>tn34013 ic cal certificate protocol pressure</p> </td> </tr> <tr> <td> <p>kq=<input id="varkq" type="text"></p> </td> <td> <p>tn34013 ic cal certificate protocol tw30 beam quality correction value</p> </td> </tr> <tr> <td> <p>kak->dw=<input id="varkak" type="text"> </td> <td> <p>correction factor tn 34013 ic ptw. air kerma --> absorbed dose water convertion tw30 water phantom manual pg43</p> </td> </tr> </p> <p><input type="button" value="calculate step 1" onclick="docalcone()"></p> <p><input type="button" value="calculate step 2" onclick="docalctwo()"></p> </table> <br> </html> edit 2: working function:
function docalcone() { var varnk = document.getelementbyid('varnk').value; var varqr = document.getelementbyid('varqr').value; var vart = document.getelementbyid('vart').value; var varto = document.getelementbyid('varto').value; var varpo = document.getelementbyid('varpo').value; var varp = document.getelementbyid('varp').value; var varkq = document.getelementbyid('varkq').value; var varkak = document.getelementbyid('varkak').value; var result1 = document.getelementbyid('stepone'); var stepone = varnk * (math.pow(10,9)) * varqr * (math.pow(10,-12)) * ( 273 + vart ) / ( 273 + varto ) * varpo / varp * varkq * varkak; num = stepone; result1.value = num.toprecision(4); }
call docalctwo function @ end of docalcone, passing along variables need, , should expect! can nuke 2nd button have well. here's updated code:
update: made 1 function , added think correct math. don't have clue you're trying calculate excel-style math can translate on javascript one-to-one. order of operations you!
function docalcone() { var varnk = document.getelementbyid('varnk').value; var varqr = document.getelementbyid('varqr').value; var vart = document.getelementbyid('vart').value; var varto = document.getelementbyid('varto').value; var varpo = document.getelementbyid('varpo').value; var varp = document.getelementbyid('varp').value; var varkq = document.getelementbyid('varkq').value; var varkak = document.getelementbyid('varkak').value; var result1 = document.getelementbyid('stepone'); var stepone = varnk * varqr * ( 273 + vart ) / ( 273 + varto ) * varpp / varp * varkq * varkak; result1.value = stepone; } honestly, don't need 2 functions here assume have/had reasons break that. know can combine these functions 1 , should work.
another point i'd make variables create inside 1 function not available different function. called "scope" , determined looking @ opening/closing curly brackets ({ , }). poorly formatted code makes harder keep track of ;).
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