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Trying to find previous DOM elements and get input value jquery

I am trying to create a table that when a user click update, it will get the first and second input value. I am trying to use prev to find the first two DOM element and get the value, but fail, what should I do? Any help is appreciated.
$('.update_button').on("click",function(){
var update_val_1 = $(this).prev().find('input:first').val();
var update_val_2 = $(this).prev().find('input:nth-child(2)').val();
alert(update_val_1);
alert(update_val_2);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<tr class="gridtable">
<td><input type="text" value="apple" /></td>
<td><input type="text" value="one" /></td>
<td><button type="button" class="update_button">UPDATE</button></td>
</tr>
<tr class="gridtable">
<td><input type="text" value="banana" /></td>
<td><input type="text" value="three" /></td>
<td><button type="button" class="update_button">UPDATE</button></td>
</tr>
<tr class="gridtable">
<td><input type="text" value="berry" /></td>
<td><input type="text" value="ten" /></td>
<td><button type="button" class="update_button">UPDATE</button></td>
</tr>

The problem is that prev looks for sibling nodes. Your input elements are in different td's so they aren't siblings. Instead, you need to go to the parent row then grab the inputs from there.
Explicit example:
$('.update_button').on("click", function() {
var $parentRow = $(this).closest('.gridtable');
var $firstCell = $parentRow.find('td:first-child');
var $secondCell = $parentRow.find('td:nth-child(2)');
var $firstInput = $firstCell.find('input');
var $secondInput = $secondCell.find('input');
var update_val_1 = $firstInput.val();
var update_val_2 = $secondInput.val();
console.log(update_val_1);
console.log(update_val_2);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<table>
<tr class="gridtable">
<td>
<input type="text" value="apple" />
</td>
<td>
<input type="text" value="one" />
</td>
<td>
<button type="button" class="update_button">UPDATE</button>
</td>
</tr>
<tr class="gridtable">
<td>
<input type="text" value="banana" />
</td>
<td>
<input type="text" value="three" />
</td>
<td>
<button type="button" class="update_button">UPDATE</button>
</td>
</tr>
<tr class="gridtable">
<td>
<input type="text" value="berry" />
</td>
<td>
<input type="text" value="ten" />
</td>
<td>
<button type="button" class="update_button">UPDATE</button>
</td>
</tr>
</table>
Simplified example:
$('.update_button').on("click", function() {
var $parentRow = $(this).closest('.gridtable');
var update_val_1 = $parentRow.find('td:first-child input').val();
var update_val_2 = $parentRow.find('td:nth-child(2) input').val();
console.log(update_val_1);
console.log(update_val_2);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<table>
<tr class="gridtable">
<td>
<input type="text" value="apple" />
</td>
<td>
<input type="text" value="one" />
</td>
<td>
<button type="button" class="update_button">UPDATE</button>
</td>
</tr>
<tr class="gridtable">
<td>
<input type="text" value="banana" />
</td>
<td>
<input type="text" value="three" />
</td>
<td>
<button type="button" class="update_button">UPDATE</button>
</td>
</tr>
<tr class="gridtable">
<td>
<input type="text" value="berry" />
</td>
<td>
<input type="text" value="ten" />
</td>
<td>
<button type="button" class="update_button">UPDATE</button>
</td>
</tr>
</table>

I'm a big fan of the .closest(selector) and .find('selector') methods.
The first one goes up the dom until it finds the first match of the given selector.
The second one goes down the dom and finds all matches.
.eq(index) is like array[index] for jQuery. It takes a collection of jQuery elements and returns the one at the given index.
$('.update_button').on("click",function(){
var inputs = $(this).closest('.gridtable').find('input');
var value1 = inputs.eq(0).val();
var value2 = inputs.eq(1).val();
});

How can I swap the form values of table row1 by the form values of table row2 without changing the table rows using javascript?

I am trying to swap the form values in row1 with the form values of row2 without swapping the rows. Can someone show me away to achieve this in pure Javascript, vanilla JS, or jQuery. I made the table rows shorter with just two rows, but the actual table consists of 17 rows. Please look very closely at the ids and form values in the third example.
When the UP or DOWN button is not click, the table looks like this in simple form:
<form id="menuitems">
<table class="toolbaritems">
<tbody class="sortable">
<tr id="row1">
<td><button class="up_arrow">UP</button></td>
<td><input value="1></td>
<td><select><option="1" selected></option></select></td>
<td><select><option="1a" selected></option></select></td>
<td><img id="img1"></td>
</tr>
<tr id="row2">
<td><button class="down_arrow">DOWN</button></td>
<td><input value="2"></td>
<td><select><option="2" selected></option></select></td>
<td><select><option="2a" selected></option></select></td>
<td><img id="img2"></td>
</tr>
<tr><td><input type="submit" value="SAVE"></td></tr>
</tbody>
</table>
</form>
This the code currently - When the UP or DOWN buttons are clicked the table looks like this:
<form id="menuitems">
<table class="toolbaritems">
<tbody class="sortable">
<tr id="row2">
<td><button class="up_arrow">UP</button></td>
<td><input value="2"></td>
<td><select><option="2" selected></option></select></td>
<td><select><option="2a" selected></option></select></td>
<td><img id="img2"></td>
</tr>
<tr id="row1">
<td><button class="down_arrow">DOWN</button></td>
<td><input value="1"></td>
<td><select><option="1" selected></option></select></td>
<td><select><option="1a" selected></option></select></td>
<td><img id="img1"></td>
</tr>
<tr><td><input type="submit" value="SAVE"></td></tr>
</tbody>
</table>
</form>
This is what I am trying to accomplish - The values of the inputs should swap except for the tr. Notices the tr ids remain the same but form values are swapped:
Is there a way to achieve this in pure javascript, vanilla JS, or jquery. It will even be even better if this can be done with .html() instead of .val()
<form id="menuitems">
<table class="toolbaritems">
<tbody class="sortable">
<tr id="row1">
<td><button class="down_arrow">DOWN</button></td>
<td><input value="2"></td>
<td><select><option="2" selected></option></select></td>
<td><select><option="2a" selected></option></select></td>
<td><img id="img2"></td>
</tr>
<tr id="row2">
<td><button class="up_arrow">UP</button></td>
<td><input value="1"></td>
<td><select><option="1" selected></option></select></td>
<td><select><option="1a" selected></option></select></td>
<td><img id="img1"></td>
</tr>
<tr><td><input type="submit" value="SAVE"></td></tr>
</tbody>
</table>
</form>

Sorry it took awhile to get back to this. I am submitting this as another answer so that you can compare the two solutions. They are quite similar, and you may find it useful to compare the changes.
jsFiddle Solution
var tbl = $('table'),new_ndx,topRow,trStuff,botRow,brStuff;
$(document).on('click','button',function() {
var dir = $(this).attr('class');
var row = $(this).closest("tr");
var ndx = row.index();
//row.remove();
if (dir=='up_arrow'){
new_ndx = ndx-1;
topRow = tbl.find('tr').eq(new_ndx);
trStuff = topRow.html();
botRow = tbl.find('tr').eq(ndx);
brStuff = botRow.html();
topRow.html(brStuff);
botRow.html(trStuff);
} else {
new_ndx = ndx++;
topRow = tbl.find('tr').eq(new_ndx);
trStuff = topRow.html();
botRow = tbl.find('tr').eq(ndx);
brStuff = botRow.html();
topRow.html(brStuff);
botRow.html(trStuff);
}
});

$(document).ready(function() {
$(".up_arrow,.down_arrow").click(function() {
var row = $(this).parents("tr");
if ($(this).is(".up_arrow")) {
alert("Inner Html Of Previous Row : " + row.prev().html());
} else {
alert("Inner Html Of Next Row : " + row.next().html());
}
});
});
table tr:first-child .up_arrow,
table tr:last-child .down_arrow {
visibility: hidden;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<table>
<tr>
<td>
<button class="down_arrow">DOWN</button>
<button class="up_arrow">UP</button>
</td>
<td>
<input value="1">
</td>
</tr>
<tr>
<td>
<button class="down_arrow">DOWN</button>
<button class="up_arrow">UP</button>
</td>
<td>
<input value="2">
</td>
</tr>
<tr>
<td>
<button class="down_arrow">DOWN</button>
<button class="up_arrow">UP</button>
</td>
<td>
<input value="3">
</td>
</tr>
<tr>
<td>
<button class="down_arrow">DOWN</button>
<button class="up_arrow">UP</button>
</td>
<td>
<input value="4">
</td>
</tr>
<tr>
<td>
<button class="down_arrow">DOWN</button>
<button class="up_arrow">UP</button>
</td>
<td>
<input value="5">
</td>
</tr>
</table>

$(document).ready(function() {
$(".up_arrow,.down_arrow").click(function() {
var objRow = $(this).parents("tr");
var intCurrentInputValue = objRow.find("input").val();
if ($(this).is(".up_arrow")) {
var intPreviousInputValue = objRow.prev("tr").find("input").val();
objRow.find("input").val(intPreviousInputValue);
objRow.prev("tr").find("input").val(intCurrentInputValue);
} else {
var intNextInputValue = objRow.next("tr").find("input").val();
objRow.find("input").val(intNextInputValue);
objRow.next("tr").find("input").val(intCurrentInputValue);
}
});
});
table tr:first-child .up_arrow ,
table tr:last-child .down_arrow
{
visibility: hidden;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<table>
<tr>
<td>
<button class="down_arrow">DOWN</button>
<button class="up_arrow">UP</button>
</td>
<td>
<input value="1">
</td>
</tr>
<tr>
<td>
<button class="down_arrow">DOWN</button>
<button class="up_arrow">UP</button>
</td>
<td>
<input value="2">
</td>
</tr>
<tr>
<td>
<button class="down_arrow">DOWN</button>
<button class="up_arrow">UP</button>
</td>
<td>
<input value="3">
</td>
</tr>
<tr>
<td>
<button class="down_arrow">DOWN</button>
<button class="up_arrow">UP</button>
</td>
<td>
<input value="4">
</td>
</tr>
<tr>
<td>
<button class="down_arrow">DOWN</button>
<button class="up_arrow">UP</button>
</td>
<td>
<input value="5">
</td>
</tr>
</table>

I'm not entirely sure what you're trying to achieve, but your code is a bit all over the place.
Here's a sample of a pretty basic 'up/down' table row thingy.
Try not to mix using jQuery and vanilla JS. If you're using jQuery, you shouldn't need to use document.getElementsByClassName (or anything similar) at all. Use the $('.class') selector.
$('table').on('click', '.up', function(){
var $row = $(this).parents('tr');
var $prevRow = $(this).parents('tr').prev('tr');
$row.insertBefore($prevRow);
});
$('table').on('click', '.down', function(){
var $row = $(this).parents('tr');
var $prevRow = $(this).parents('tr').next('tr');
$row.insertAfter($prevRow);
});

$(document).ready(function() {
$(".up_arrow,.down_arrow").click(function(e) {
var objCurrentRow = $(this).parents("tr");
var objAnotherRow = objCurrentRow.next("tr");
if ($(this).is(".up_arrow")) {
var objAnotherRow = objCurrentRow.prev("tr");
}
var arrAllInputOfCurrentRow = objCurrentRow.find("input,select");
var arrAllInputOfAnotherRow = objAnotherRow.find("input,select");
$.each(arrAllInputOfCurrentRow, function(intIndex, objInput) {
var mixTempValue = $(objInput).val();
var $objAnotherInput = $(arrAllInputOfAnotherRow[intIndex]);
$(objInput).val($objAnotherInput.val());
if ($objAnotherInput.is('select')) {
var objTempDropDown = $(objInput).html();
$(objInput).html($objAnotherInput.html());
$objAnotherInput.html(objTempDropDown);
}
$objAnotherInput.val(mixTempValue);
});
});
});
table tr:first-child .up_arrow,
table tr:last-child .down_arrow {
visibility: hidden;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form id="menuitems">
<table class="toolbaritems">
<tbody class="sortable">
<tr id="row1">
<td>
<button type="button" class="up_arrow">UP</button>
</td>
<td>
<button type="button" class="down_arrow">DOWN</button>
</td>
<td>
<input type="text" value="1" />
</td>
<td>
<select>
<option value="1" selected>1</option>
</select>
</td>
<td>
<select>
<option value="1a" selected>1a</option>
</select>
</td>
</tr>
<tr id="row2">
<td>
<button type="button" class="up_arrow">UP</button>
</td>
<td>
<button type="button" class="down_arrow">DOWN</button>
</td>
<td>
<input type="text" value="2" />
</td>
<td>
<select>
<option value="2" selected>2</option>
</select>
</td>
<td>
<select>
<option value="2a" selected>2a</option>
</select>
</td>
</tr>
<tr id="row3">
<td>
<button type="button" class="up_arrow">UP</button>
</td>
<td>
<button type="button" class="down_arrow">DOWN</button>
</td>
<td>
<input type="text" value="3" />
</td>
<td>
<select>
<option value="3" selected>3</option>
</select>
</td>
<td>
<select>
<option value="3a" selected>3a</option>
</select>
</td>
</tr>
</tbody>
</table>
</form>

$(document).on("click", ".up_arrow,.down_arrow", function(e) {
var $objCurrentRow = $(this).parents("tr");
var strTempHtml = $objCurrentRow.html();
var $objAnotherRow = $objCurrentRow.next("tr");
if ($(this).is(".up_arrow")) {
var $objAnotherRow = $objCurrentRow.prev("tr");
}
$objCurrentRow.html($objAnotherRow.html());
$objAnotherRow.html(strTempHtml);
});
table tr:first-child .up_arrow,
table tr:last-child .down_arrow {
visibility: hidden;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form id="menuitems">
<table class="toolbaritems">
<tbody class="sortable">
<tr id="row1">
<td>
<button type="button" class="up_arrow">UP</button>
</td>
<td>
<button type="button" class="down_arrow">DOWN</button>
</td>
<td>
<input type="text" value="1" />
</td>
<td>
<select>
<option value="1" selected>1</option>
</select>
</td>
<td>
<select>
<option value="1a" selected>1a</option>
</select>
</td>
<td>
<img src="http://www.w3schools.com/images/compatible_chrome.gif" id="img1" />
</td>
</tr>
<tr id="row2">
<td>
<button type="button" class="up_arrow">UP</button>
</td>
<td>
<button type="button" class="down_arrow">DOWN</button>
</td>
<td>
<input type="text" value="2" />
</td>
<td>
<select>
<option value="2" selected>2</option>
</select>
</td>
<td>
<select>
<option value="2a" selected>2a</option>
</select>
</td>
<td>
<img src="http://www.w3schools.com/images/compatible_opera.gif" id="img2" />
</td>
</tr>
<tr id="row3">
<td>
<button type="button" class="up_arrow">UP</button>
</td>
<td>
<button type="button" class="down_arrow">DOWN</button>
</td>
<td>
<input type="text" value="3" />
</td>
<td>
<select>
<option value="3" selected>3</option>
</select>
</td>
<td>
<select>
<option value="3a" selected>3a</option>
</select>
</td>
<td>
<img src="http://www.w3schools.com/images/compatible_firefox.gif" id="img3" />
</td>
</tr>
</tbody>
</table>
</form>

Ali beat me to the punch, but here's another way to do it:
jsFiddle Demo
var tbl = $('table'),new_ndx;
$(document).on('click','button',function() {
var dir = $(this).attr('class');
var row = $(this).closest("tr");
var ndx = row.index();
row.remove();
if (dir=='up_arrow'){
new_ndx = ndx-1;
tbl.find('tr').eq(new_ndx).before(row);
}else{
new_ndx = ndx++;
tbl.find('tr').eq(new_ndx).after(row);
}
});
table tr:first-child .up_arrow,
table tr:last-child .down_arrow {visibility: hidden;}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
<table>
<tr>
<td>
<button class="down_arrow">DOWN</button>
<button class="up_arrow">UP</button>
</td>
<td>
<input value="1">
</td>
</tr>
<tr>
<td>
<button class="down_arrow">DOWN</button>
<button class="up_arrow">UP</button>
</td>
<td>
<input value="2">
</td>
</tr>
<tr>
<td>
<button class="down_arrow">DOWN</button>
<button class="up_arrow">UP</button>
</td>
<td>
<input value="3">
</td>
</tr>
<tr>
<td>
<button class="down_arrow">DOWN</button>
<button class="up_arrow">UP</button>
</td>
<td>
<input value="4">
</td>
</tr>
<tr>
<td>
<button class="down_arrow">DOWN</button>
<button class="up_arrow">UP</button>
</td>
<td>
<input value="5">
</td>
</tr>
</table>

Replace text based on submit

What I am trying to do is to dynamically replace the corresponding text with the string from input field.(field1>field11, field2>field22)
http://jsfiddle.net/c2CUE/3/
Can you give me any clue on how to do it in jquery?
<table>
<tr>
<td><h2>Field 1</h2>
<input type="text" name="field1" value="qwerty" class="field1"></td>
<td><span class="field11">asdasd</span></td>
</tr>
<tr>
<td><h2>Field 1</h2>
<input type="text" name="field2" value="qwerty"></td>
<td><span class="field22">asdasd</span></td>
</tr>
</table>

this should do the trick
$(document).ready(function () {
$("input.field1").on("keyup",function () {
$("span.field11").html($(this).val());
});
});
or in live
http://jsfiddle.net/u8EB9/
you could also hook the function to the "change" event but than youll get your text only updated, after you left the input!
this depends on your needs!

Try this:
<form id="form" method="post">
<table>
<tr>
<td><h2>Field 1</h2>
<input type="text" name="field1" value="qwerty" class="field1"></td>
<td><span class="field11">asdasd</span></td>
</tr>
<tr>
<td><h2>Field 1</h2>
<input type="text" name="field2" value="qwerty"></td>
<td><span class="field22">asdasd</span></td>
</tr>
</table>
</form>
and jquery:
$(document).ready(function(){
$('#form').submit(function(e){
e.preventDefault();
$('.field11').html($('.field1').val());
$('.field22').html($('.field2').val());
});
}

if your intention is to use this code multiple times it might be better to use classs rather than id's to stop you needing to create a bunch of bind events.
html:
<table>
<tr>
<td>
<h2>Field 1</h2>
<input type="text" name="field1" value="qwerty" class="replacer" />
<input type="button" class="replace" value="replace" />
</td>
<td>
<span class="replacee field11">asdasd</span>
</td>
</tr>
<tr>
<td>
<h2>Field 1</h2>
<input type="text" class="replacer" name="field2" value="qwerty" />
<input type="button" class="replace" value="replace" />
</td>
<td>
<span class="replacee field22">asdasd</span>
</td>
</tr>
</table>
JS:
$('.replace').on('click', function(){
var parentRow = $(this).closest('tr');
parentRow.find('.replacee').text(parentRow.find('.replacer').val());
});
http://jsfiddle.net/c2CUE/4/

HTML:
<table>
<tr>
<td><h2>Field 1</h2>
<input type="text" name="field1" value="qwerty" class="field1"></td>
<td><span class="field11">asdasd</span></td>
</tr>
<tr>
<td><h2>Field 1</h2>
<input type="text" name="field2" value="qwerty"></td>
<td><span class="field22">asdasd</span></td>
</tr>
</table>
JQuery:
$("input[type='text']").on("keyup",function () {
$(this).parent().next().find('span').html($(this).val());
});
Demo:
http://jsfiddle.net/F74ec/

How to select element except its children?

I have simple table which looks like this:
<table>
<tbody>
<tr>
<td>
<input type="text">
</td>
<td>
<input type="text">
</td>
<td>
<input type="text">
</td>
<td>
<input type="text">
</td>
<td>
<input type="text">
</td>
</tr>
<tr>
<td>
<input type="text">
</td>
<td>
<input type="text">
</td>
<td>
<input type="text">
</td>
<td>
<input type="text">
</td>
<td>
<input type="text">
</td>
</tr>
<tr>
<td>
<input type="text">
</td>
<td>
<input type="text">
</td>
<td>
<input type="text">
</td>
<td>
<input type="text">
</td>
<td>
<input type="text">
</td>
</tr>
<tr>
<td>
<input type="text">
</td>
<td>
<input type="text">
</td>
<td>
<input type="text">
</td>
<td>
<input type="text">
</td>
<td>
<input type="text">
</td>
</tr>
<tr class="error">
<td>
<input type="text">
</td>
<td>
<input type="text">
</td>
<td>
<input type="text">
</td>
<td>
<input type="text">
</td>
<td>
<input type="text">
</td>
</tr>
</tbody>
</table>
When i click on tr i need to add custom class to it, but only whe i click on tr, not on the input inside it. How to do this?
I tried something like this:
table.find('tbody').on('click', 'tr:not(input)', function(){
jQuery(this).toggleClass('error');
});

table.find('tbody').on('click', 'tr', function(e) {
if (e.target != this)
return;
$(this).toggleClass('error');
});

I think the best you can do here is check the node name to see if it is the td or the tr - or include other tags if you want.
$('tbody').on('click', 'tr', function (e) {
if (e.target.nodeName.toLowerCase() === "td" || e.target.nodeName.toLowerCase() === "tr") {
$(this).toggleClass('error');
}
});
If you specifically want the input excluded, you could then exclude those:
$('tbody').on('click', 'tr', function (e) {
if (!$(e.target).is(':input')) {
$(this).toggleClass('error');
}
});

You can stop the event from bubbling up to the tr element by using event.stopPropagation:
table.find("tr").on("click", function () {
jQuery(this).toggleClass("error");
}).find("input").on("click", function (event) {
event.stopPropagation();
});
Here's some documentation for ya if you'd like to know more: http://api.jquery.com/event.stopPropagation/
Here's a JSFiddle of the solution: http://jsfiddle.net/tM59b/1/

Add a click listener to the input and return false; from it to stop the event from propagating to the tr.
Like so:
$('tr input').click(function(e){
return false;
});

Getting last file input in a table

Here is my html:
<table>
<tbody><tr>
<td>
<label for="DocumentsName">Názov</label>
</td>
<td>
<input name="DocumentsName" class="input documentsName" value="" style="width: 10em;" type="text">
</td>
</tr>
<tr>
<td>
<label for="DocumentsDescription">Popis</label>
</td>
<td>
<textarea name="DocumentsDescription" id="DocumentsDescription" cols="15" rows="4" class="input" style="width: 340px; font: 1em sans-serif;"></textarea>
</td>
</tr>
<tr>
<td>
<label for="Document1">Doc 1</label>
</td>
<td>
<input name="Document1" class="input document1" style="width: 10em;" type="file">
</td>
</tr>
</tbody></table>
+++++
I am trying to get the litest input with type="file" from the table upon clicking the #addDocumentFileInput link.
This returns null. Why?
<script type="text/javascript">
$(document).ready(function() {
$("#addDocumentFileInput").click(function() {
var $lastFileInput = $(this).prev().children("tr").last().children("input");
alert($lastFileInput.html());
return false;
});
});
</script>

Because prev() gives you the table element and it has no tr children, only one tbody child. A row has no input children either, only td children.
children only searches for elements one level below.
Use find instead:
$(this).prev().find('input[type="file"]').last()
// or fancy: find('input:file:last')