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<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<tr>
    <td class='type'> Type name </td>
    <td class='number'> 102030 </td>
    <td class='software'> 1.0-Alpha </td>
    <td ><button class='btnSelect'>Order</button>
</tr>
<script>
    $(".btnSelect").on('click',function() {
        var tdNumber = $(this).find('.number').html();
        var data = $(this).find('.number').html();
        alert(data);
    })
</script>

If I clicked order button show error undefined , what wrong ?

Thanks

1st: close the </td> tag in <td ><button class='btnSelect'>Order</button>

2nd: you need to use .closest('tr').find

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<table>
<tr>
    <td class='type'> Type name </td>
    <td class='number'> 102030 </td>
    <td class='software'> 1.0-Alpha </td>
    <td ><button class='btnSelect'>Order</button></td>
</tr>
</table>
<script>
$(document).ready(function(){ // you may need to use document ready
    $(".btnSelect").on('click',function(){
      var data = $(this).closest('tr').find('.number').html();
      alert(data);
    });
});
</script>

How to Get the Value of Text Input Field Using JavaScript, You can simply use the value property of the DOM input element to get the value of text input field. The following example will display the entered text in the input  Get Dictionary Value By Key With Get () in Python To get the value of the key you want, you have to use the get () function using Python. The function requires a single argument which is the key in the dictionary. The below example contains 6 elements with both keys and the associated value of the dictionary.

Basically you have few mistake in your html dom.

<tr>
    <td class='type'> Type name </td>
    <td class='number'> 102030 </td>
    <td class='software'> 1.0-Alpha </td>
    <td><button class='btnSelect'>Order</button>
</tr>

button is not wrapped with td and tr is not wrapped with table and in your jQuery

$(".btnSelect").on('click', function() {
    var tdNumber = $(this).find('.number').html();
    var data = $(this).find('.number').html();
    alert(data);
});

there is event on button which is inside the tr, note that you can do find from child to parent. i.e. $(this).find('.number').html(); here $(this) is the object of clicked button and you are searching the siblings of the parent i.e. tr you can review the following example which is written based on your code that you have provided.

$(".btnSelect").on('click', function() {
    var data = $(this).parent().siblings('.number').text();
    alert(data);
})
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<table>
    <tr>
        <td class='type'> Type name </td>
        <td class='number'> 102030 </td>
        <td class='software'> 1.0-Alpha </td>
        <td><button class='btnSelect'>Order</button></td>
    </tr>
</table>

How do I get the value of text input field using JavaScript?, There are various methods to get an input textbox value directly (without wrapping the input element inside a form element):. Method 1: document. You can get tested controller without changing returned type. IActionResult is base type for all others. Cast result into expected type and compare returned value with expected. Since you are testing asynchronous method, make test method asynchronous as well.

When you want to select any of the element of same tree you must go to root and then find it.

in html dom element to go to root you have to use closest() function and for find from root you have to use find() function

use this

$(".btnSelect").on('click',function(){
    var tdNumber = $(this).closest('tr').find('.number').html();
    var data = $(this).closest('tr').find('.number').html();
    alert(data);
});

How to get the value of text input field using JavaScript , There is a text value property which can set and return the value of the value attribute of a text field. Also we can use jquery val() method inside script to get or set  A.withLatestFrom(B): Use this operator to get the most recent value from observable B when observable A emits. Will give you both values in an array [a, b]. A.combineLatest(B): Use this operator to get the most recent values from A and B every time either A or B emits. Will give you both values in an array.

How to get the value of a form element using JavaScript, In this article we demonstrate the use of JavaScript for accessing the values of form elements. Later, we will demonstrate all the concepts using a real world  Changing the Way You Get Used Car Values. Vehicle history is an important factor in determining a car’s value. In addition to taking a vehicle’s year, make, model, mileage, location and condition into consideration, CARFAX History-Based Value is powered by vehicle-specific data that’s unique to CARFAX and tied directly to each car through its vehicle identification number (VIN).

Retrieve the value of a text field, Display the current value of the text field; Interactive example. In this recipe, learn how to retrieve the text a user has entered into a text field using the following  I generated a bar plot, how can I display the value of the bar on each bar? Current plot: What I am trying to get: My code: import os import numpy as np import matplotlib.pyplot as plt x = [u'

Object.values(), The Object.values() method returns an array of a given object's own enumerable property values, in the same order as that provided by a forin loop. Get the latest and greatest from MDN delivered straight to your inbox. #4: How to get all the table row cell values using jquery. Here now we read all the data of a given HTML table. In real scenario many time we need to send complete table data to the server .i.e fetch table value and store it in JSON array, which later passes it to the server-side.