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Javascript document.getElementById function not returning checkbox value to HTML form

I have been searching for an answer everywhere but just can not find what I need.
I have a webpage that has an HTML table on the left column and an HTML form on the right column. When I click on a row in the table on the left I want it to display the values in the form on the right.
I have this working perfectly for the text fields on the form, but not for the two checkboxes. My javascript will return either true or false or checked and unchecked to the document.getElementById within the script itself by using alert(); but I have no idea what it needs to allow the checkboxes to display these values. I thought the document.getElementById would return the values but it seems it does not.
I have tried all kinds of conveluted ways to get this to work but can not seem to get the correct code needed.
I am new to all this so there is most likely something really simple I am missing.
This is the HTML form code:
<div class="column right">
<table>
<tr></tr>
<tr>
<div class="lockinv">
<form autocomplete="off" name="lockform" class="keyassign" action="includes/lockinventory.inc.php"
method="post">
<label id="inventory" for="locknum">Lock Number</label>
<input id="invlocknum" type="text" name="locknum" value="" required>
<label id="inventory" for="locktype">Lock Type</label>
<input id="invlocktype" type="text" name="locktype" value="" required>
<label id="inventory" for="keycode">Key Code</label>
<input id="invkeycode" type="text" name="keycode" value="" required>
<label id="inventory" for="lockengraved">Lock Engraved</label>
<input id="invlockengraved" type="hidden" name="lockengraved" value="0">
<input id="invlockengraved" type="checkbox" name="lockengraved" value="1">
<label id="inventory" for="lockmastered">Lock Mastered</label>
<input id="invlockmastered" type="hidden" name="lockmastered" value="0">
<input id="invlockmastered" type="checkbox" name="lockmastered" value="1">
<label id="inventory" for="locknote">Lock Note</label>
<textarea id="inventorynote" name="locknote" rows="5" cols="60"></textarea>
<div class="wheel">
<?php
if (isset($_GET["error"])) {
if($_GET["error"] == "lockexists") {
echo "<p>Lock Already In Inventory!</p>";
}
else if ($_GET["error"] == "lockexistsfailed") {
echo "<p>Lock Already In Inventory!</p>";
}
}
?>
</div>
<input id="bt6" type="submit" name="submit" value="Save">
<button id="bt6" type="reset" name="button">Cancel</button>
</form>
</div>
</tr>
</table>
</div>
This is my JavaScript code:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js" type="text/javascript"></script>
<script language="javascript"></script>
<script>
$(function () {
$('#lockTable td').click(function () {
var currentRow = $(this).closest("tr");
var locknum = currentRow.find("td:eq(0)").text();
var locktype = currentRow.find("td:eq(1)").text();
var keycode = currentRow.find("td:eq(2)").text();
var engraved = currentRow.find("td:eq(3)").find(":checkbox");
var mastered = currentRow.find("td:eq(4)").find(":checkbox");
var locknote = currentRow.find("td:eq(5)").text();
var lockengraved = engraved.prop("checked");
if (lockengraved === true) {
$grved = "checked";
} else {
$grved = "unchecked";
}
var lockmastered = mastered.prop("checked");
if (lockmastered === true) {
$msted = "checked";
} else {
$msted = "unchecked";
}
document.getElementById('invlocknum').value = locknum;
document.getElementById('invlocktype').value = locktype;
document.getElementById('invkeycode').value = keycode;
document.getElementById("invlockengraved").value = $grved;
document.getElementById('invlockmastered').value = $msted;
document.getElementById('inventorynote').value = locknote;
alert(document.getElementById("invlockengraved").value);
alert(document.getElementById("invlockmastered").value);
});
});
</script>
<p id="invlocknum"></p>
<p id="invlocktype"></p>
<p id="invkeycode"></p>
<p id="invlockengraved"></p>
<p id="invlockmastered"></p>
<p id="invlocknote"></p>
<p id="info"></p>
<p id="result"></p>

I found the answer to my issue. I had to modify my if statement in the Javascript to the following. Works the way I want it to. Thanks to all that helped.
var lockengraved = engraved.prop("checked");
if (lockengraved === true) {
document.getElementById("invlockengraved").checked = lockengraved;
}else if (lockengraved === false) {
document.getElementById("invlockengraved").checked = lockengraved;
}

check input number whether bigger than certain value by using javascript

I am trying to do some calculation in page, however, it doesn't work, I have tried the following code, does anyone can tell me the correct answer?
For example, when I enter a number then it will do one of the calculation.
<table><tr><td>
<input name="per_pax" size="2" style="border-style:none" type="text" id="per_pax" value="">
</td><td>
<input name="sum_tlcost" type="hidden" id="sum_tlcost" value="<?php echo $tl_cost;?>">
<input name="sum_htl_pp" type="hidden" id="sum_htl_pp" value="<?php echo $sum_htl_pp;?>">
<input name="sum_coach" type="hidden" id="sum_coach" value="<?php echo $sum_coach;?>">
<input name="pax" size="5" readonly="readonly" type="text" id="pax" value="">
</td></tr></table>
<script>
$(document).ready(function () {
var total = Number($("#per_pax").val());
if(total >= 20) {
$("#sum_tlcost,#sum_htl_pp,#sum_coach,#per_pax").keyup(function () {
if (parseInt($("#per_pax").val()) >= 20) {
$("#pax").val(Math.round(Number($("#sum_htl_pp").val()) + Number($("#sum_tlcost").val()) / Number($("#per_pax").val()) + Number($("#sum_coach").val()) / Number($("#per_pax").val()));
)}else{
$("#pax").val(Math.round(Number($("#sum_htl_pp").val()) + Number($("#sum_tlcost").val()) + Number($("#sum_coach").val())))
}
})}})
</script>

I'm not overly fond of the jquery keyup calls... so here's a snippet that should call your function using normal DOM event calls. The input event triggers as they type.. which should be similar to what you're trying to do with the keyups... I also cleaned up the function itself to make it more readable for presentation.
function onInputChange() {
var perPax = parseInt($("#per_pax").val());
var tlCost = Number($("#sum_tlcost").val());
var htlPP = Number($("#sum_htl_pp").val());
var coach = Number($("#sum_coach").val());
var newValue = 0;
if (perPax < 20) {
newValue = (htlPP + tlCost) / (perPax + (coach / perPax));
} else {
newValue = htlPP + tlCost + coach;
}
$("#pax").val(Math.round(newValue))
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<table>
<tr>
<td>
<input name="per_pax" size="2" style="border-style:none" type="text" id="per_pax" value="" oninput="onInputChange()">
</td>
<td>
<input name="sum_tlcost" type="hidden" id="sum_tlcost" value="<?php echo $tl_cost;?>">
<input name="sum_htl_pp" type="hidden" id="sum_htl_pp" value="<?php echo $sum_htl_pp;?>">
<input name="sum_coach" type="hidden" id="sum_coach" value="<?php echo $sum_coach;?>">
<input name="pax" size="5" readonly="readonly" type="text" id="pax" value="">
</td>
</tr>
</table>

How to use single input box two value?

in my Previous i have two separate input box % and $ value looks like this my code :
<tr>
<td>Down payment $</td>
<td>
<input name="downpaymentpc" id="downpaymentpc" type="text" size="8" maxlength="8" onChange="javascript:downPaymentPcChanged(true);" value="<?php echo $min_fha_down_payment;?>" />%</td>
<td colspan="2">Or $
<input name="downpaymentamt" id="downpaymentamt" type="text" size="8" maxlength="8" onChange="javascript:downPaymentAmountChanged(true);" />
</td>
</tr>
this my old code its have two separate input fields its Working well.after that i changed in my new design . i have set single input fields i have to set % and $ image on click change code Looks like
<div class="col-md-2 padding-Zero">
<input name="downpaymentpc" id="downpaymentpc" type="text" class="txt" size="8" maxlength="8" onChange="javascript:downPaymentPcChanged(true);" value="<?php echo $min_fha_down_payment;?>" />
</div>
<div class="col-md-1 padding-lft">
<img src="Content/Images/percent.png" onclick="changeColor(event,this.src)" style="cursor:pointer" />
</div>
i have no idea about it how to set another value in single input fields when i change image % to $ ? any idea about ? please help me ?Really stuck it?
< --NEW -->
In this code don't have id its have only name
<td>Monthly MIP </td>
<td>
<input name="monthlymippc" type="text" size="8" maxlength="8" onChange="javascript:monthlyMIPPcChanged(true)" />
%</td>
<td>Or $
<input name="monthlymipamt" type="text" size="8" maxlength="8" onChange="javascript:monthlyMIPAmountChanged(true)"/>
</td>
My script:
i added extra id in code and i have create this script its not Working..
$(document).ready(function(){
$(".changeImgvalue").click(functon(){
var type=$(this).attr("type");
if(type == 'per'){
$(this).attr({
"type":"amount",
"src":"content/Images/percent.png"
});
$("#monthlymippc").attr("onchange","javascript:monthlyMIPPcChanged(true);");
} else if(type == 'amount'){
$(this).attr({
"type" :"per";
"src":"content/Images/RedDoller.png"
})
$("#monthlymipamt").attr("onchange",onChange="javascript:monthlyMIPAmountChanged(true)")
}
})
})
any error in my code ?

HTML:
<img src="Content/Images/percent.png" type="per" class="changeImg" style="cursor:pointer"/>
Jquery:
$(document).ready(function () {
$(".changeImg").click(function () {
var type = $(this).attr("type");
if (type == 'per') {
$(this).attr({
"type": "amount",
"src": "Content/Images/dollar.png"
});
$("#downpaymentpc").attr("onchange", "downPaymentAmountChanged(true);");
} else if (type == 'amount') {
$(this).attr({
"type": "per",
"src": "Content/Images/percent.png"
});
$("#downpaymentpc").attr("onchange", "downPaymentPcChanged(true);");
}
});
});
HTML:
<img src="Content/Images/percent.png" type="per" class="changeImg" style="cursor:pointer"/>
Jquery:
$(document).ready(function () {
$(".changeImg").click(function () {
var type = $(this).attr("type");
if (type == 'per') {
$(this).attr({
"type": "amount",
"src": "Content/Images/dollar.png"
});
} else if (type == 'amount') {
$(this).attr({
"type": "per",
"src": "Content/Images/percent.png"
});
}
});
});

jquery .show() by php variable

I'm trying to trigger jquery .show() events triggered by php variables.
Here's my .php (which draws from a form submission on a separate page):
$last_pic_displayed = trim($_POST["last_pic_displayed"]);
if ( strlen($last_pic_displayed) <= 0 )
{ $last_pic_displayed = trim($_GET["last_pic_displayed"]); }
and here's my .show() code:
<script>
var lpic = "<?php echo $last_pic_displayed; ?>";
lpic = parseInt(lpic);
if (lpic == 0) {
$("#1").show();
}
</script>
I use variations on this script for multiple divs with the intention that the correct $last_pic_displayed; value will trigger the correct div to show, but so far none have.
Here's an example of the form that's posting data to my php:
<form id="buttons" action="process_form.php" method="post">
<label for="child_name"><img src="images/enter_name_text.png" alt="Enter Your Name" id="name_text"></label>
<input type="text" id="child_name" name="child_name" />
<section>
<input checked="checked" id="radio1" name="last_pic_displayed" type="radio" value="0" />
<label for="radio1"><img src="images/3_letter_text.png" alt="3 Letter Words" class="level_text">
</label>
</section>
<section>
<input checked="checked" id="radio2" name="last_pic_displayed" type="radio" value="6" />
<label for="radio1"><img src="images/4_letter_text.png" alt="4 Letter Words" class="level_text">
</label>
</section>
<section>
<input checked="checked" id="radio3" name="last_pic_displayed" type="radio" value="13" />
<label for="radio1"><img src="images/5_letter_text.png" alt="5 Letter Words" class="level_text">
</label>
</section>
<section id="submit_button">
<input type="image" name="submit" src="images/submit.png" />
</section>
</form>
Here is an example of the section of code that I'm trying to get to show when the submitted form data matches a certain value along with my script in relation:
<div class="word" id="1" data-value="1">
<img src="images/Bat.png" class="letter_text">
<form id="f1" action="results.php" method="post">
<input type="hidden" name="child_name" value="<?php $child_name; ?>" />
<input type="hidden" name="running_score" value="<?php $running_score; ?>" />
<input type="hidden" name="last_pic_displayed" value="1" />
<input type="hidden" name="correct_spelling" value="BAT" />
<input type="hidden" name="last_pic_flag" value="NO" />
<input type="hidden" name="level" value="3_letter" />
<input type="text" name="submitted_spelling" />
<input type="image" class="submit" src="images/submit.png" />
</form>
</div>
<script>
var lpic = "<?php echo $last_pic_displayed; ?>";
lpic = parseInt(lpic);
if (lpic == 0) {
$("#1").show();
}
alert(lpic);
</script>
I'm pretty new at all this, so I definitely appreciate your help.
EDIT: Updated with syntax corrections; problem currently persists.
EDIT2: Updated with form example.
EDIT3: Updated with parseInt() and example of the div I'm trying to show.

You need to parseInt() the "lpic" variable Like that way :
var lpic = "<?php echo $last_pic_displayed; ?>";
lpic = parseInt(lpic);
if (lpic == 0) {
$("#1").show();
}

use it:-
var lpic = "<?php echo $last_pic_displayed; ?>";
lpic = parseInt(lpic);
if (lpic == 0) {
$("#1").show();
}

use this
<script>
var lpic = "<?php echo $last_pic_displayed; ?>"; // this must in ""
if (lpic == '0') { // must be == instead =
$("#1").show();
}
</script>

JQuery ignoring form element

I have this JQuery:
$(document).ready(function() {
$("#generate").click(function() {
var texts = [];
alert();
$("form label").each(function() {
var oLabel = $(this);
var oInput = oLabel.next();
texts.push(oLabel.text() + " " + oInput.val());
});
texts[0] += texts[1];
texts[2] += texts[3];
for(i=3;i<texts.length;i++)
texts[i-1] = texts[i];
texts[texts.length-1] = null;
$("#cont").html(texts.join("<br />"));
});
});
What it do is it reads form elements then types them as regular text (there is a purpose for this).
And this is how my form looks like ...
<div id="cont" style="float:right; width:75%; height:auto">
<form onSubmit="return generate();">
<label class="itemLabel" for="name">Name : </label>
<input name="name" type="text" class="itemInput" value="<? echo $queryB[1]; ?>" readonly="readonly" />
<label># Some Text</label><br />
<label for="priPhone" class="itemLabel">Customer Telephone Number : </label>Phone#
<input name="priPhone" type="text" class="itemInput" readonly="readonly" value="<? echo $queryB[2]; ?>" />
<label for="secPhone"> // Mobile#</label>
<input name="secPhone" type="text" class="itemInput" readonly="readonly" value="<? echo $queryB[3]; ?>" /><br />
<label class="itemLabel" for="email">Customer Email Address : </label>
<input name="email" type="text" class="itemInput" readonly="readonly" value="<? echo $queryB[4]; ?>" /><br />
<label>***************</label><br />
<label>Best Regards,</label><br />
<input name="another_field" type="text" /><br />
<label>last thing</label><br />
<button type="button" id="generate">Generate</button>
</form>
</div>
now, when I click the button "Generate", everything goes well except that it ignores "another_field" and doesn't get its value
Anyone got an idea to solve this? (Note: This piece of code will be running on around 25 forms so I need to have it working.)
UPDATE:
Sample output:
Name : username # Some Text
Customer Telephone Number : 90237590 // 3298579
Customer Email Address : email#host.com
***************
Best Regards,
last_field
last thing
Workaround
Since I'm having all the forms have the same ending, I've been able to get to this code:
texts[0] += " " + texts[1];
texts[1] = texts[2] + " " + texts[3];
for(i=4;i<texts.length;i++)
texts[i-2] = texts[i];
texts[texts.length-2] = texts[texts.length-3];
texts[texts.length-3] = $("#agent").val() ;
texts[texts.length-1] = null;
It solved the problem, but I'm looking for a better way to accomplish this.

Try this javascript:
$(document).ready(function() {
$("#generate").click(function() {
var texts = [];
$("form").children().each(function() {
var el = $(this);
if (el.prop('tagName') == "LABEL") texts.push(el.text());
if (el.prop('tagName') == "INPUT") texts.push(el.val());
if (el.prop('tagName') == "BR") texts.push("<br />");
});
$("#cont").html(texts.join(""));
});
});
Working example here:
http://jsfiddle.net/Q5AD4/6/

Your <br/> tag is the next tag after the label before "another_field". You should probably make your next call something like:
var oInput = oLabel.next('input');