parseFloat in jquery is not picking each decimal value


    <table style="width:40%; float: left">
        <tr>
            <th>SWG</th>
            <th>Size</th>
            <th>Size in MM</th>
            <th>Size in INCH</th>
            <th style="display:"></th>
        </tr>
<tr id="43 kacha">
            <td contenteditable>43.5</td>
            <td contenteditable>43 kacha</td>
            <td contenteditable>0.088</td>
            <td contenteditable>0.0034</td>
            <td><button id="edit_entry" value="43 kacha"><img src="images/icons/edit.png"></button></td>
        </tr><tr id="43">
            <td contenteditable>43.0</td>
            <td contenteditable>43</td>
            <td contenteditable>0.092</td>
            <td contenteditable>0.0036</td>
            <td><button id="edit_entry" value="43"><img src="images/icons/edit.png"></button></td>
        </tr><tr id="42 kacha">
            <td contenteditable>42.5</td>
            <td contenteditable>42 kacha</td>
            <td contenteditable>0.095</td>
            <td contenteditable>0.0038</td>
            <td><button id="edit_entry" value="42 kacha"><img src="images/icons/edit.png"></button></td>
        </tr><tr id="42">
            <td contenteditable>42.0</td>
            <td contenteditable>42</td>
            <td contenteditable>0.102</td>
            <td contenteditable>0.0040</td>
            <td><button id="edit_entry" value="42"><img src="images/icons/edit.png"></button></td>
        </tr><tr id="41 kacha">
            <td contenteditable>41.5</td>
            <td contenteditable>41 kacha</td>
            <td contenteditable>0.107</td>
            <td contenteditable>0.0042</td>
            <td><button id="edit_entry" value="41 kacha"><img src="images/icons/edit.png"></button></td>
        </tr><tr id="40 kacha">
            <td contenteditable>40.5</td>
            <td contenteditable>40 kacha</td>
            <td contenteditable>0.117</td>
            <td contenteditable>0.0046</td>
            <td><button id="edit_entry" value="40 kacha"><img src="images/icons/edit.png"></button></td>
        </tr><tr id="40">
            <td contenteditable>40.0</td>
            <td contenteditable>40</td>
            <td contenteditable>0.122</td>
            <td contenteditable>0.0044</td>
            <td><button id="edit_entry" value="40"><img src="images/icons/edit.png"></button></td>
        </tr><tr id="39 kacha">
            <td contenteditable>39.5</td>
            <td contenteditable>39 kacha</td>
            <td contenteditable>0.127</td>
            <td contenteditable>0.0050</td>
            <td><button id="edit_entry" value="39 kacha"><img src="images/icons/edit.png"></button></td>
        </tr><tr id="39">
            <td contenteditable>39.0</td>
            <td contenteditable>39</td>
            <td contenteditable>0.132</td>
            <td contenteditable>0.0052</td>
            <td><button id="edit_entry" value="39"><img src="images/icons/edit.png"></button></td>
        </tr><tr id="38 kacha">
            <td contenteditable>38.5</td>
            <td contenteditable>38 kacha</td>
            <td contenteditable>0.145</td>
            <td contenteditable>0.0056</td>
            <td><button id="edit_entry" value="38 kacha"><img src="images/icons/edit.png"></button></td>
        </tr><tr id="150">
            <td contenteditable>38.0</td>
            <td contenteditable>150</td>
            <td contenteditable>0.152</td>
            <td contenteditable>0.0060</td>
            <td><button id="edit_entry" value="150"><img src="images/icons/edit.png"></button></td>
        </tr><tr id="180">
            <td contenteditable>37.5</td>
            <td contenteditable>180</td>
            <td contenteditable>0.180</td>
            <td contenteditable>0.0071</td>
            <td><button id="edit_entry" value="180"><img src="images/icons/edit.png"></button></td>
        </tr><tr id="190">
            <td contenteditable>36.0</td>
            <td contenteditable>190</td>
            <td contenteditable>0.190</td>
            <td contenteditable>0.0076</td>
            <td><button id="edit_entry" value="190"><img src="images/icons/edit.png"></button></td>
        </tr><tr id="224">
            <td contenteditable>35.5</td>
            <td contenteditable>224</td>
            <td contenteditable>0.224</td>
            <td contenteditable>0.0088</td>
            <td><button id="edit_entry" value="224"><img src="images/icons/edit.png"></button></td>
        </tr><tr id="215">
            <td contenteditable>35.0</td>
            <td contenteditable>215</td>
            <td contenteditable>0.215</td>
            <td contenteditable>0.0085</td>
            <td><button id="edit_entry" value="215"><img src="images/icons/edit.png"></button></td>
        </tr><tr id="240">
            <td contenteditable>33.5</td>
            <td contenteditable>240</td>
            <td contenteditable>0.240</td>
            <td contenteditable>0.0095</td>
            <td><button id="edit_entry" value="240"><img src="images/icons/edit.png"></button></td>
        </tr><tr id="250">
            <td contenteditable>33.0</td>
            <td contenteditable>250</td>
            <td contenteditable>0.254</td>
            <td contenteditable>0.0100</td>
            <td><button id="edit_entry" value="250"><img src="images/icons/edit.png"></button></td>
        </tr></table>       <span id="err" style="float: left"></span>
        <script>
                $(document).ready(function(){
                    $("button#edit_entry").click(function(){
                        var size = this.value;
                        var id = parseFloat($('tr#'+size+' td').eq(0).text(),10);
                        var size_mm = parseFloat($('tr#'+size+' td').eq(2).text(),10);
                        var size_inch = parseFloat($('tr#'+size+' td').eq(3).text(),10);
                        $("#err").html(id);                                 
                    }); 
                }); 
        </script>

in the above table, Each table row has 4 td, on selecting the button associated with each tr, values of td of that row is meant to be selected/stored

but values like

43.5 , 0.088 , 0.0034 ; 
42.5 , 0.095 , 0.0038 ;
41.5 , ... ;
40.5 , ... ;
39.5 , ... ;
38.5 , ... ;

its shows "Nan"

and for the rest of the TR, its showing the exact values,

My requirement is to pick the values and send them through AJAX to database in case of UPDATION

Solution

You have many ids with space - 38 kacha etc, which don't evaluate to a correct selector in your click function.

One way resolve this is to use dash separated ids 38-kacha like below:

$(document).ready(function() {
  $("button#edit_entry").click(function() {
    var size = this.value;
    var id = parseFloat($('tr#' + size + ' td').eq(0).text(), 10);
    var size_mm = parseFloat($('tr#' + size + ' td').eq(2).text(), 10);
    var size_inch = parseFloat($('tr#' + size + ' td').eq(3).text(), 10);
    $("#err").html(id);
    
    console.log(size, id, size_mm, size_inch)
  });
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<table style="width:100%;">
  <tr>
    <th>SWG</th>
    <th>Size</th>
    <th>Size in MM</th>
    <th>Size in INCH</th>
    <th style="display:"></th>
  </tr>
  <tr id="43-kacha">
    <td contenteditable>43.5</td>
    <td contenteditable>43 kacha</td>
    <td contenteditable>0.088</td>
    <td contenteditable>0.0034</td>
    <td><button id="edit_entry" value="43-kacha"><img src="images/icons/edit.png"></button></td>
  </tr>
  <tr id="43">
    <td contenteditable>43.0</td>
    <td contenteditable>43</td>
    <td contenteditable>0.092</td>
    <td contenteditable>0.0036</td>
    <td><button id="edit_entry" value="43"><img src="images/icons/edit.png"></button></td>
  </tr>
  <tr id="42-kacha">
    <td contenteditable>42.5</td>
    <td contenteditable>42 kacha</td>
    <td contenteditable>0.095</td>
    <td contenteditable>0.0038</td>
    <td><button id="edit_entry" value="42-kacha"><img src="images/icons/edit.png"></button></td>
  </tr>
  <tr id="42">
    <td contenteditable>42.0</td>
    <td contenteditable>42</td>
    <td contenteditable>0.102</td>
    <td contenteditable>0.0040</td>
    <td><button id="edit_entry" value="42"><img src="images/icons/edit.png"></button></td>
  </tr>
  <tr id="41-kacha">
    <td contenteditable>41.5</td>
    <td contenteditable>41 kacha</td>
    <td contenteditable>0.107</td>
    <td contenteditable>0.0042</td>
    <td><button id="edit_entry" value="41-kacha"><img src="images/icons/edit.png"></button></td>
  </tr>
  <tr id="40-kacha">
    <td contenteditable>40.5</td>
    <td contenteditable>40 kacha</td>
    <td contenteditable>0.117</td>
    <td contenteditable>0.0046</td>
    <td><button id="edit_entry" value="40-kacha"><img src="images/icons/edit.png"></button></td>
  </tr>
  <tr id="40">
    <td contenteditable>40.0</td>
    <td contenteditable>40</td>
    <td contenteditable>0.122</td>
    <td contenteditable>0.0044</td>
    <td><button id="edit_entry" value="40"><img src="images/icons/edit.png"></button></td>
  </tr>
  <tr id="39-kacha">
    <td contenteditable>39.5</td>
    <td contenteditable>39 kacha</td>
    <td contenteditable>0.127</td>
    <td contenteditable>0.0050</td>
    <td><button id="edit_entry" value="39-kacha"><img src="images/icons/edit.png"></button></td>
  </tr>
  <tr id="39">
    <td contenteditable>39.0</td>
    <td contenteditable>39</td>
    <td contenteditable>0.132</td>
    <td contenteditable>0.0052</td>
    <td><button id="edit_entry" value="39"><img src="images/icons/edit.png"></button></td>
  </tr>
  <tr id="38-kacha">
    <td contenteditable>38.5</td>
    <td contenteditable>38 kacha</td>
    <td contenteditable>0.145</td>
    <td contenteditable>0.0056</td>
    <td><button id="edit_entry" value="38-kacha"><img src="images/icons/edit.png"></button></td>
  </tr>
  <tr id="150">
    <td contenteditable>38.0</td>
    <td contenteditable>150</td>
    <td contenteditable>0.152</td>
    <td contenteditable>0.0060</td>
    <td><button id="edit_entry" value="150"><img src="images/icons/edit.png"></button></td>
  </tr>
  <tr id="180">
    <td contenteditable>37.5</td>
    <td contenteditable>180</td>
    <td contenteditable>0.180</td>
    <td contenteditable>0.0071</td>
    <td><button id="edit_entry" value="180"><img src="images/icons/edit.png"></button></td>
  </tr>
  <tr id="190">
    <td contenteditable>36.0</td>
    <td contenteditable>190</td>
    <td contenteditable>0.190</td>
    <td contenteditable>0.0076</td>
    <td><button id="edit_entry" value="190"><img src="images/icons/edit.png"></button></td>
  </tr>
  <tr id="224">
    <td contenteditable>35.5</td>
    <td contenteditable>224</td>
    <td contenteditable>0.224</td>
    <td contenteditable>0.0088</td>
    <td><button id="edit_entry" value="224"><img src="images/icons/edit.png"></button></td>
  </tr>
  <tr id="215">
    <td contenteditable>35.0</td>
    <td contenteditable>215</td>
    <td contenteditable>0.215</td>
    <td contenteditable>0.0085</td>
    <td><button id="edit_entry" value="215"><img src="images/icons/edit.png"></button></td>
  </tr>
  <tr id="240">
    <td contenteditable>33.5</td>
    <td contenteditable>240</td>
    <td contenteditable>0.240</td>
    <td contenteditable>0.0095</td>
    <td><button id="edit_entry" value="240"><img src="images/icons/edit.png"></button></td>
  </tr>
  <tr id="250">
    <td contenteditable>33.0</td>
    <td contenteditable>250</td>
    <td contenteditable>0.254</td>
    <td contenteditable>0.0100</td>
    <td><button id="edit_entry" value="250"><img src="images/icons/edit.png"></button></td>
  </tr>
</table> 
<span id="err"></span>