Develop Reference

Monitor the changes in table using JavaScript or HTML

I want to change the total price when the count or unit price of the products are changed on the website. I know I should use the onChange function, but I have no idea about how to write the JavaScript code.
<table id="productTable" class="layui-table">
<thead>
<tr>
<th>No.</th>
<th>PART NUMBER</th>
<th>DESCRIPTION</th>
<th>QTY(PCS)</th>
<th>UNIT PRICE (USD)</th>
<th>AMOUNT(USD)</th>
<th>OPRATION</th>
</tr>
</thead>
<tbody id="columns">
<tr style="display:none">
<td>1</td>
<td><input type="hidden" name="numberList"></td>
<td><input type="hidden" name="remarkList"></td>
<td><input type="hidden" name="countList"></td>
<td><input type="hidden" name="priceList"></td>
<td><input type="hidden" name="totalPriceList"></td>
</tr>
<tr th:each="orderProduct:${orderProducts}">
<td th:text="${orderProducts.indexOf(orderProduct)+1}"></td>
<td contenteditable="true" >
<input type="text" name="numberList" class="layui-input number" th:value="${orderProduct.number}">
</td>
<td contenteditable="true" >
<input type="text" name="remarkList" class="layui-input remark" th:value="${orderProduct.remark}">
</td>
<td id="productCoun" contenteditable="true" >
<input id="productCount" type="text" name="countList" onchange="update()" class="layui-input count"
th:value="${orderProduct.count}">
</td>
<td id="normalPric" contenteditable="true" >
<input id="normalPrice" type="text" name="priceList" onchange="update()" class="layui-input price"
th:value="${orderProduct.price}">
</td>
<td id="totalPric" th:text="${orderProduct.price}*${orderProduct.count}">
<input id="total" type="text" name="totalPriceList" class="layui-input price"
th:text="${orderProduct.price}*${orderProduct.count}">
</td>
<td>
Edit
<a href="javascript:void(0)" class="delBtn redType" onclick='delColumns(this)'>Del</a>
</td>
</tr>
</tbody>
</table>
I hope that the totalPrice = count*price could refresh whenever the user changes one of those values.

You can easily monitor the pointed input fields (#productCount and #normalPrice) and change the value of #total according to it. In the code below, I use the input event and I'm not using inline event handlers, but rather the function addEventListener() (know why).
const productCountInput = document.querySelector('#productCount');
const productPriceInput = document.querySelector('#normalPrice');
const totalPriceInput = document.querySelector('#total');
function updateTotalPrice() {
totalPriceInput.value = (parseFloat(productCountInput.value) * parseFloat(productPriceInput.value)) || 0;
}
productCountInput.addEventListener('input', updateTotalPrice);
productPriceInput.addEventListener('input', updateTotalPrice);
<table id="productTable" class="layui-table">
<thead>
<tr>
<th>No.</th>
<th>PART NUMBER</th>
<th>DESCRIPTION</th>
<th>QTY(PCS)</th>
<th>UNIT PRICE (USD)</th>
<th>AMOUNT(USD)</th>
<th>OPRATION</th>
</tr>
</thead>
<tbody id="columns">
<tr style="display:none">
<td>1</td>
<td><input type="hidden" name="numberList"></td>
<td><input type="hidden" name="remarkList"></td>
<td><input type="hidden" name="countList"></td>
<td><input type="hidden" name="priceList"></td>
<td><input type="hidden" name="totalPriceList"></td>
</tr>
<tr th:each="orderProduct:${orderProducts}">
<td th:text="${orderProducts.indexOf(orderProduct)+1}"></td>
<td contenteditable="true">
<input type="text" name="numberList" class="layui-input number" th:value="${orderProduct.number}">
</td>
<td contenteditable="true">
<input type="text" name="remarkList" class="layui-input remark" th:value="${orderProduct.remark}">
</td>
<td id="productCoun" contenteditable="true">
<input id="productCount" type="text" name="countList" class="layui-input count" th:value="${orderProduct.count}">
</td>
<td id="normalPric" contenteditable="true">
<input id="normalPrice" type="text" name="priceList" class="layui-input price" th:value="${orderProduct.price}">
</td>
<td id="totalPric" th:text="${orderProduct.price}*${orderProduct.count}">
<input id="total" type="text" name="totalPriceList" class="layui-input price" th:text="${orderProduct.price}*${orderProduct.count}">
</td>
<td>
Edit
Del
</td>
</tr>
</tbody>
</table>

I am trying to create a form using a table for the inputs

As I say, I am using a table to create a form. input-small and its label fits great in various places. I have opened up three rows in one column to place a 3 row textarea. Simple I thought, but I get a messed up table that appears OK in the live view but has half the input-small placeholders are missing, in the design view (Dreamweaver)it is full of broken tags.
Here is the code without the textarea and with.
Without
<table width="581" border="0" summary="Contact">
<caption>
Personal Details
</caption>
<tr>
<td width="120">Full Name</td>
<td width="226"><input class="input-small" type="text" placeholder=".input-small"></td>
<td width="71">Phone</td>
<td width="146"><input class="input-small" type="text" placeholder=".input-small"></td>
</tr>
<tr>
<td>Postal Address</td>
<td rowspan="4"> </td>
<td>Email</td>
<td><input class="input-small" type="text" placeholder=".input-small"></td>
</tr>
<tr>
<td> </td>
<td rowspan="2">Emergency Contact</td>
<td rowspan="2"><input class="input-small" type="text" placeholder=".input-small"></td>
</tr>
<tr>
<td> </td>
</tr>
<tr>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr>
<td>Postcode</td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
</table>
With
<table width="581" border="0" summary="Contact">
<caption>
Personal Details
</caption>
<tr>
<td width="120">Full Name</td>
<td width="226"><input class="input-small" type="text" placeholder=".input-small"></td>
<td width="71">Phone</td>
<td width="146"><input class="input-small" type="text" placeholder=".input-small"></td>
</tr>
<tr>
<td>Postal Address</td>
<td rowspan="4"><textarea rows="3" class="input-xxlarge" placeholder=".input-xxlarge"></td>
<td>Email</td>
<td><input class="input-small" type="text" placeholder=".input-small"></td>
</tr>
<tr>
<td> </td>
<td rowspan="2">Emergency Contact</td>
<td rowspan="2"><input class="input-small" type="text" placeholder=".input-small"></td>
</tr>
<tr>
<td> </td>
</tr>
<tr>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr>
<td>Postcode</td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
</table>
Cheers

Your problem is that the textarea is not closed:
<td rowspan="4"><textarea rows="3" class="input-xxlarge" placeholder=".input-xxlarge"></textarea></td>
See </textarea>. It is needed.

Close off the field with </textarea>:
<textarea rows="3" class="input-xxlarge" placeholder=".input-xxlarge"></textarea>

javascript calculator with click to calculate

I have a working calculator on my website that is used for business expense savings estimation. currently the calculator auto-calculates in real time as the user inputs numbers. i would like the user to have to click a calculate button in order to see any results. could someone please help as i am having a hard time adjusting the code myself. here is the current code:
function calc() {
var cost = document.getElementById('phone').value * (.30) +
document.getElementById('energy').value * (.05) +
document.getElementById('cell').value * (.30) + document.getElementById('office').value * (.15) + document.getElementById('card').value *
(.35) + document.getElementById('waste').value * (.5) +
document.getElementById('payroll').value * (.5);
document.getElementById('cost').value = (cost * 12).toFixed(2);
}
<form name="form1" method="post" action="">
<table width="33%" align="center">
<tr>
<td valign="top" style="text-align: center"><strong>
Category</strong>
</td>
<td style="text-align: center"><strong>Monthly Expenses</strong>
</td>
</tr>
<tr>
<td valign="top"> </td>
<td> </td>
</tr>
<tr>
<td width="47%" valign="top">Telephone & Internet</td>
<td width="53%">
<input name="phone" id="phone" type="text" onchange="calc
()" />
</td>
</tr>
<tr>
<td valign="top">Energy</td>
<td>
<input name="energy" id="energy" type="text" onchange="calc()" />
</td>
</tr>
<tr>
<td valign="top">Cell Phone</td>
<td>
<input name="cell" id="cell" type="text" onchange="calc()" />
</td>
</tr>
<tr>
<td valign="top">Office Supplies</td>
<td>
<input name="office" id="office" type="text" onchange="calc()" />
</td>
</tr>
<tr>
<td valign="top">Merchant Card Fees</td>
<td>
<input name="card" id="card" type="text" onchange="calc()" />
</td>
</tr>
<tr>
<td valign="top">Waste Removal</td>
<td>
<input name="waste" id="waste" type="text" onchange="calc()" />
</td>
</tr>
<tr>
<td height="31" valign="top">3rd Party Payroll Fees</td>
<td>
<input name="payroll" id="payroll" type="text" onchange="calc
()" />
</td>
</tr>
<tr>
</tr>
</table>
<p> </p>
<div align="center">
<table width="33%" border="0">
<tr>
<td width="54%" height="31" valign="top"><strong>Estimated Annual
Savings:</strong>
</td>
<td width="46%">
<textarea name="cost" rows="1" id="cost" readonly style="overflow:hidden" input type="number"></textarea>
</td>
</tr>

Currently, your inputs are set up to call calc() whenever their onchange event is fired. This happens whenever the value is changed and the input is blurred (no longer in focus).
Remove the onchange="calc()" attribute on all your inputs, and add a button whever it makes sense to on your page with onclick="calc()":
<button onclick="calc()">Calculate</button>

Place button with Javascript event outside form
<button onclick="calc();">Calculate</button>

Delete all onchange="calc()" and add this html code to your page, that's it.
<button onclick="calc()">Calculate Expenses</button>

Remove the call to onchange="calc()" from all.
Put <div align="center">
<table width="33%" border="0">
<tr>
<td align="Center">
<input type="button" value="Click To Calculate" onclick="calc()" />
</td>
</tr>
</div>

Table aligning left when elements are shown

I have this HTML code:
<html>
<head>
<script type="text/javascript">
function showStuff(id) {
var e = document.getElementById(id);
if (e.style.display == 'block') e.style.display = 'none';
else e.style.display = 'block';
}
</script>
</head>
<body>
<FORM name=myForm>
<TABLE border=0 align=center>
<TBODY>
<TR>
<TD align=right>Quiz/Test Title:</TD>
<TD align=left>
<INPUT size=25 type=text name=t>
</TD>
</TR>
<TR>
<TD align=right>
<input type="button" value="Show/Hide" onclick="showStuff('multiplechoice')">
</TD>
</TR>
</TBODY>
<TBODY id="multiplechoice" style="display: none;" align=center>
<TR>
<TD align=right>
<h3>Multiple Choice</h3>
</TD>
</TD>
<TR>
<TD align=right>Section Name:</TD>
<TD align=left>
<INPUT size=20 type=text name=section1>
</TD>
</TR>
<TR>
<TD align=right>Directions:</TD>
<TD align=left>
<INPUT size=71 type=text name=directions1>
</TD>
</TR>
<TR>
<TD align=right>Question Number:</TD>
<TD align=left>
<INPUT size=2 type=text name=n1 id=n1 value=1 onkeypress="return alpha(event,numbers)">
</TD>
</TR>
<TR>
<TD align=right>Question:</TD>
<TD align=left>
<textarea rows=2 cols=55 name=q1 id=q1></textarea>
</TD>
</TR>
<TR>
<TD align=right>Answer A:</TD>
<TD align=left>
<INPUT size=35 type=text name=a1>
</TD>
</TR>
<TR>
<TD align=right>Answer B:</TD>
<TD align=left>
<INPUT size=35 type=text name=b1>
</TD>
</TR>
<TR>
<TD align=right>Answer C:</TD>
<TD align=left>
<INPUT size=35 type=text name=c1>
</TD>
</TR>
<TR>
<TD align=right>Answer D:</TD>
<TD align=left>
<INPUT size=35 type=text name=d1>
</TD>
</TR>
<TR>
<TD align=right>Answer (A,B,C,D):</TD>
<TD align=left>
<INPUT size=1 type=text name=correct1 onkeyup="upper(this)" onkeypress="return alpha(event,letters)" maxlength="1">
</TD>
</TR>
</TBODY>
</TABLE>
</FORM>
</body>
</html>
Ok so the problem is when I click show/hide it shows the form, but it moves everything in the form over to the left. I would like it to stay all aligned in the center. Is there anyway to do this? I left out all the other functions I have linked to everything else, so don't worry about that it all works. Any help is greatly appreciated.

why don't you place your two TBodys into separate table?
something like below:
<FORM name=myForm>
<TABLE border=0 align=center>
<TBODY>
<TR>
<TD align=right>Quiz/Test Title:</TD>
<TD align=left>
<INPUT size=25 type=text name=t>
</TD>
</TR>
<TR>
<TD align=right><input type="button" value="Show/Hide" onclick="showStuff('multiplechoice')">
</TD>
</TR>
</TBODY>
</table>
<table border=0 align=center>
<TBODY id="multiplechoice" style="display: none;" align=center>
<TR>
<TD align=right><h3>Multiple Choice</h3></TD>
</TR>
<TR>
<TD align=right>Section Name:</TD>
<TD align=left><INPUT size=20 type=text name=section1></TD>
</TR>
<TR>
<TD align=right>Directions:</TD>
<TD align=left><INPUT size=71 type=text name=directions1></TD>
</TR>
<TR>
<TD align=right>Question Number:</TD>
<TD align=left><INPUT size=2 type=text name=n1 id=n1 value=1 onkeypress="return alpha(event,numbers)"></TD>
</TR>
<TR>
<TD align=right>Question:</TD>
<TD align=left><textarea rows=2 cols=55 name=q1 id=q1></textarea></TD>
</TR>
<TR>
<TD align=right>Answer A:</TD>
<TD align=left><INPUT size=35 type=text name=a1></TD></TR>
<TR>
<TD align=right>Answer B:</TD>
<TD align=left><INPUT size=35 type=text name=b1></TD>
</TR>
<TR>
<TD align=right>Answer C:</TD>
<TD align=left><INPUT size=35 type=text name=c1></TD>
</TR>
<TR>
<TD align=right>Answer D:</TD>
<TD align=left><INPUT size=35 type=text name=d1></TD>
</TR>
<TR>
<TD align=right>Answer (A,B,C,D):</TD>
<TD align=left><INPUT size=1 type=text name=correct1 onkeyup="upper(this)" onkeypress="return alpha(event,letters)" maxlength="1"></TD>
</TR>
</TBODY>
</TABLE>
</FORM>
it fixes everything. see this working codepen

get value from iframe

I am building a website of yellopages in which I want to upload and display images on some pages.
First, I insert the image name in to the database while uploading. I want to get the image name on the parent page.
addproduct.php
<form action="" method="post" enctype="multipart/form-data" name="uploadform" id="uploadform">
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td width="42%" align="right">Product Title </td>
<td width="1%"> </td>
<td width="118" height="118" align="center" bordercolor="#FFFFFF" bgcolor="#FFFFFF" ><iframe src="" id="fileframe" name="fileframe" width="118" height="118" scrolling="no" frameborder="0"></iframe></td>
</tr>
<tr>
<td align="right"> </td>
<td> </td>
<td onclick="whatever();">value</td>
</tr>
<tr>
<td align="right"> </td>
<td> </td>
<td><label>
<input name="thefile" type="file" id="thefile" />
upload</label></td>
</tr>
<tr>
<td align="right">Product Description </td>
<td> </td>
<td> </td>
</tr>
<tr>
<td align="right"> </td>
<td> </td>
<td> </td>
</tr>
<tr>
<td colspan="3"></td>
</tr>
<tr>
<td> </td>
<td> </td>
<td><label>
<input name="web" type="submit" id="web" value="Continue" />
</label></td>
</tr>
</table>
</form>
Javascript in this page
function whatever() {
mmspobj=document.getElementId("fileframe");
// if (mmspobj.tagName=='iframe'){
//alert("hi");
//mmsiobj=window.frames[fileframe].document.getElementId('fileframe').value;
alert(mmspobj);
//}
}
uploader.js
function init() {
fileUploadEvents();
}
function fileUploadEvents() {
var links = document.getElementsByTagName("a");
if (links) {
for (var x=0; x<links.length; ++x) {
if (links[x].className == "uploadfile")
links[x].onclick = uploadFile;
}
}
}
function uploadFile() {
var uploadForm = document.getElementById("uploadform");
if (uploadForm) {
uploadForm.target="fileframe";
uploadForm.action="upload.php";
}
uploadForm.submit();
}
How can I get the image name in addproduct.php?

You might find it easier to have the iframe call a JavaScript function in the parent, rather than have the parent window try to read the name from the iframe.