输入框之间的计算

Question

我正在编写一个脚本，我需要总计两个计算并确定总报价。问题是我不能让他们在将它们添加到一起时工作。请记住我是一个新手，代码可能没有完全优化，但我相信你会明白的。代码的任何改进都是值得欢迎的。

<div> 
     <fieldset> 
      <legend>Printing</legend> 
     Number of color pages:<input type="text" id="color" placeholder="Color Pages" onchange="printing();" onchange = "binding();" /> 
     <input type="text" id="colorprice" readonly="readonly" /><br /> 
     Number of black and white pages:<input type="text" id="black" placeholder="Black and White Pages" onchange="printing();" onchange = "binding();" /> 
     <input type="text" id="blackprice" readonly="readyonly" /><br /> 
     Total Pages:<input type="text" id="pages_total" readonly="readonly" /> <input type="text" id="sum_pages" readonly="readonly" onchange = "suming();"/> 
     </fieldset> 

    </div> 

<div> 
     <fieldset> 
      <legend>Binding</legend> 
      Number of Hardbooks: <input type="text" id="books" placeholder="Number of Hardbooks" onchange="binding();" /> 
      <input type="text" id="books_price" readonly="readonly" /><br /> 
      Number of Softbacks: <input type="text" id="softback" placeholder="Number of Softbacks" onchange="binding();" /> 
      <input type="text" id="soft_price" readonly="readonly" /><br /> 
      Total Bindings: <input type="text" id="total_bindings" readonly="readonly" /><input type "text" id="total_price" readonly="readonly" /> 
     </fieldset> 
    </div> 

<p>Final quote:<input type="text" readonly="readonly" id="quote" /></p> 

function printing() { 
       var blackPrice; 
       var colorPrice; 
       var printBlack = new Array(0.10, 0.08, 0.06, 0.05); 
       var printColor = new Array(0.40, 0.35, 0.30, 0.25); 


       var colorPages = parseInt(document.getElementById("color").value); 
       var blackPages = parseInt(document.getElementById("black").value); 

       if (colorPages < 11) { 
       colorPrice = colorPages * printColor[0]; 
        } 
       else if (colorPages >= 11 && colorPages < 51){ 
       colorPrice = colorPages * printColor[1]; 
        } 
       else if (colorPages >= 51 && colorPages < 101){ 
        colorPrice = colorPages * printColor[2]; 
        } 
       else { 
        colorPrice = colorPages * printColor[3]; 
        } 



       if (blackPages < 11) { 
       blackPrice = blackPages * printBlack[0]; 
        } 
       else if (blackPages >= 11 && colorPages < 51){ 
       blackPrice = blackPages * printBlack[1]; 
        } 
       else if (blackPages >= 51 && colorPages < 101){ 
       blackPrice = blackPages * printBlack[2]; 
        } 
       else { 
       blackPrice = blackPages * printBlack[3]; 
        } 

       var pagesTotal = colorPages + blackPages; 

       var printSum = blackPrice + colorPrice; 


       document.getElementById("colorprice").value = "$" + colorPrice.toFixed(2); 
       document.getElementById("blackprice").value = "$" + blackPrice.toFixed(2); 
       document.getElementById("sum_pages").value = "$" + printSum.toFixed(2); 
       document.getElementById("pages_total").value = pagesTotal; 

       return printSum; 

} 



function binding(){ 

var softbackPrice; 
var hardbookPrice; 
var hardBooks = new Array(37.50, 23.50); 
var softBacks = new Array(3.75, 4.00, 4.25, 4.50, 4.75, 5.00, 5.25); 
var noBooks = parseInt(document.getElementById("books").value); 
var noSoftBacks = parseInt(document.getElementById("softback").value); 
var colorPages = parseInt(document.getElementById("color").value); 
var blackPages = parseInt(document.getElementById("black").value); 
var totalPages = colorPages + blackPages; 

if (noBooks == 1) { 
    hardbookPrice = hardBooks[0]; 
    } 
else { 
     hardbookPrice = (hardBooks[1] * (noBooks - 1)) + hardBooks[0]; 
    } 

if (totalPages <= 50) { 
    softbackPrice = softBacks[0] * noSoftBacks; 
    } 
else if (totalPages > 50 && totalPages <= 100) { 
    softbackPrice = softBacks[1] * noSoftBacks; 
    } 
else if (totalPages > 100 && totalPages <= 150) { 
    softbackPrice = softBacks[1] * noSoftBacks; 
    } 
else if (totalPages > 150 && totalPages <=200) { 
    softbackPrice = softBacks[2] * noSoftBacks; 
    } 
else if (totalPages > 200 && totalPages <= 250) { 
    softbackPrice = softBacks[3] * noSoftBacks; 
    } 
else if (totalPages > 250 && totalPages <= 300) { 
    softbackPrice = softBacks[4] * noSoftBacks; 
    } 
else if (totalPages > 300 && totalPages <= 350) { 
    softbackPrice = softBacks[5] * noSoftBacks; 
    } 
else { 
    softbackPrice = softBacks[6] * noSoftBacks; 
} 



var totalPrice = softbackPrice + hardbookPrice; 
var bindingsTotal = noSoftBacks + noBooks; 


document.getElementById("books_price").value = "$" + hardbookPrice.toFixed(2); 
document.getElementById("soft_price").value = "$" + softbackPrice.toFixed(2); 
document.getElementById("total_bindings").value = bindingsTotal; 
document.getElementById("total_price").value = "$" + totalPrice.toFixed(2); 


return totalPrice; 

} 

function totalSum() { 
var totalPrinting = printing(); 
var totalBinding = binding(); 
var subtotal = totalPrinting + totalBinding; 
document.getElementIdBy("quote").value = subtotal; 
} 

Answer 1

这里是工作的解决方案。 http://jsfiddle.net/UHnRL/2/

=缺少类型在下面的标记

<input type "text" id="total_price" readonly="readonly" /> 

Answer 2

这对我的作品（大部分）：http://jsfiddle.net/UHnRL/

有与第一onchange计算问题，因为页面的其他号码是NaN你做的parseInt后。如果文本框为空，则应将其默认为零。

可以使用isNaN^[MDN]功能来解决问题的计算：

var colorPages = parseInt(document.getElementById("color").value); 
var blackPages = parseInt(document.getElementById("black").value); 

if (isNaN(colorPages)) 
{ 
    colorPages = 0; 
} 

if (isNaN(blackPages)) 
{ 
    blackPages = 0; 
}