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JSON (JavaScript object notation) is a powerful data format to exchange data from server to client and vice versa. HTML tables are powerful tools to represent data in tabular format so that it becomes very easy to read, analyze and compare. It is very common in web development to convert JSON data into HTML tables.

In this article, we will learn how to convert JSON data into HTML tables using Javascript as well as jQuery. By the end of this article, you will have a solid understanding of JSON to HTML table conversion.

Convert JSON data into HTML tables using JavaScript

Here are the following steps to create HTML tables using JSON data.

Create a function named “convert”.

Create a sample JSON data.

Get the container using getElementByID(“container”) where we will append the table.

Get the keys of the first object of the JSON data so that we get the headings of the table.

Loop through the column names, create header cells, and set the column name as the text of the header cell.

Append the header cells to the header row and then append the header row to the header

Append the header to the table

Loop through the JSON data, create table rows, get the values of the current object in the JSON data using Object.values(item), and create table cells.

Set the value as the text of the table cell, append the table cells to the table row, and then append the table row to the table.

Example

In this example, we are converting JSON data into HTML tables using Javascript.

table, th, td { border: 1px solid black; border-collapse: collapse; } td, th { padding: 10px; }

function convert() {

let jsonData = [ { name: “Saurabh”, age: “20”, city: “Prayagraj” }, { name: “Vipin”, age: 23, city: “Lucknow”, }, { name: “Saksham”, age: 21, city: “Noida” } ];

let container = document.getElementById(“container”);

let table = document.createElement(“table”);

let cols = Object.keys(jsonData[0]);

let thead = document.createElement(“thead”); let tr = document.createElement(“tr”);

let th = document.createElement(“th”); th.innerText = item; tr.appendChild(th); }); thead.appendChild(tr); table.append(tr)

let tr = document.createElement(“tr”);

let vals = Object.values(item);

let td = document.createElement(“td”); td.innerText = elem; tr.appendChild(td); }); table.appendChild(tr); }); container.appendChild(table) } Example: Convert JSON data into HTML tables using jQuery

Here is the code to convert Convert JSON data into HTML tables using jQuery.

table, th, td { border: 1px solid black; border-collapse: collapse; } td, th {padding: 10px;}

function convert() {

let jsonData = [ { name: “Saurabh”, age: “20”, city: “Prayagraj” }, { name: “Vipin”, age: 23, city: “Lucknow”, }, { name: “Saksham”, age: 21, city: “Noida” } ];

let container = $(“#container”);

let cols = Object.keys(jsonData[0]);

$.each(cols, function(i, item){ th.text(item); tr.append(th); }); thead.append(tr); table.append(tr)

$.each(jsonData, function(i, item){

let vals = Object.values(item);

td.text(elem); tr.append(td); }); table.append(tr); }); container.append(table) }

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How To Check Input File Is Empty Or Not Using Javascript Jquery

In JavaScript, while working with the form elements, we need to validate the input fields and form elements when a user enters the value. In this tutorial, we will work with the file input.

We will also learn to validate the file input. Sometimes, we may be required to check if the file is selected in the input field, then only enable the submit button; otherwise, disable the submit button. So, it will not allow users to submit the form or file without selecting it.

Validate the file input using JavaScript

In JavaScript, we can access the file input using the id, name, tag name, or class name. After that, we can check whether the file input field contains any file value. We can add the event listener to the file input for the change event. So, whenever the value of the file input changes, the event listener is invoked, and we can check whether the file input contains any file.

Syntax

Users can follow the syntax below to use JavaScript to check if the file input is empty or not.

fileInput.addEventListener("change", function () { if (fileInput.files.length == 0) { } else { } });

In the above syntax, we have added the event listener for the change event in the file input. Also, we have passed the function expression as a callback function, which checks whether any file is selected.

The file input contains the array of the file, and we can check if the length of the array is zero if any file is not uploaded to the file input.

Example

let fileInput = document.getElementById(“fileInput”); fileInput.addEventListener(“change”, function () {

if (fileInput.files.length == 0) { } else { } });

Validate the file input using jQuery

As we can access the file input in JavaScript, we can also access it in jQuery using various methods. After that, we can check the length of the ‘files’ attribute of the file input to ensure whether the file input is empty or not.

Syntax

Users can follow the syntax below to use jQuery to check if the file input contains any file

let files = $("#fileInput")[0].files.length; if (files != 0) { } else { }

In the above syntax, we have selected the file input by its id. The ‘#’ represents the id.

Example

let output = document.getElementById(“output”); function validateFileInput() { let files = $(“#fileInput”)[0].files.length; if (files != 0) { } else { } }

Users learned to validate the file input using JavaScript or JQuery. In both examples, we have accessed the file input using the id. However, users can access the file input using either class name, tag name, or name and check the length of the ‘files’ attribute to ensure whether the file input is empty or any file is selected.

How To Create A Dropdown List Using Javascript?

We will learn to create a dropdown list using HTML and JavaScript below. Before starting with the article, let’s understand the dropdown list and why we need to use it.

The dropdown list gives multiple choices to users and allows them to select one value from all options. However, we can do the same thing using multiple radio buttons, but what if we have hundreds of choices? Then we can use the dropdown menu.

Syntax

function selectOption() {     let selectedValue = dropdown.options[dropdown.selectedIndex].text; } Example

In the example below, we have created the dropdown menu for car brands. Also, we have written the JavaScript code to get the selected value from the dropdown. The ‘onchange’ event will trigger whenever the user selects new values and invoke the selectOption() function.

Also, we have given some CSS styles to the default dropdown menu. Furthermore, we hide the dropdown menu’s arrow to improve it. In CSS, users can see how they can customize the default dropdown.

let output = document.getElementById(‘output’); function selectOption() { let dropdown = document.getElementById(‘dropdown’); let selectedIndex = dropdown.selectedIndex; let selectedValue = dropdown.options[selectedIndex].text; output.innerHTML = “The selected value is ” + selectedValue; }

We can use normal HTML, CSS, and JavaScript to create a dropdown menu from scratch. We can use HTML to make dropdowns, CSS to style them properly, and JavaScript to add behavior.

Steps

Users can follow the steps below to create a dropdown menu using HTML, CSS, and JavaScript.

Step 1 − Create a div element for the dropdown title, and style it using CSS. We have created the div element with the ‘menu-dropdwon’ class.

Step 2 − Create a div element with the ‘dropdown-list’ class to add dropdown options.

Step 4 − Now, use JavaScript to add the behavior to our dropdown.

Step 6 − In the openDropdown() function, access the div element with the class name ‘dropdown-list’ and show if it’s hidden or hides it if it is visible using the display property.

Example

.menu-dropdown { width: 10rem; height: 1.8rem; font-size: 1.5rem; background-color: aqua; color: black; border: 2px solid yellow; border-radius: 10px; padding: 2px 5px; text-align: center; justify-content: center; cursor: pointer; } .dropdown-list { display: none; z-index: 10; background-color: green; color: pink; font-size: 1.2rem; width: 10.5rem; border-radius: 10px; margin-top: 0rem; cursor: pointer; } .dropdown-list p { padding: 3px 10px; } .dropdown-list p:hover { background-color: blue; } Choose Value let output = document.getElementById(‘output’); let dropdownList = document.getElementById(“list”); dropdownList.style.display = “none”; function openDropdown() { if (dropdownList.style.display != “none”) { dropdownList.style.display = “none”; } else { dropdownList.style.display = “block”; } } const p_elements = document.getElementsByTagName(“p”); const totalP = p_elements.length; for (let i = 0; i < totalP; i++) { const option = p_elements[i]; output.innerHTML = “The selected option is ” + option.innerHTML; dropdownList.style.display = “none”; }) }

How To Retrieve Stored Value From Div Element Using Jquery?

In some situations, we need to retrieve or get the text value stored inside a particular div element to use some condition, if the text is dynamic or for some other tasks in jQuery. By getting the value stored in the div element, we can perform any task based on the value of the element in jQuery.

In jQuery, we can retrieve or get the stored value of a div element using three different methods. The methods are listed below −

By using the text() method

By using the html() method

Let us now understand working of each of these methods in details with the help of code examples.

By Using the Text() Method

The text() method in jQuery is used to get the value stored inside a div element. This method will return the value stored in the div element even if the div element has some more nested div or some other elements.

Let us now discuss it in details by practically implementing it with the help of jQuery code example.

Note: Please make sure that the jQuery script is included in the HTML document.

Steps

Step 1 − In the first step, we will create a simple div element with some direct text value inside it.

Step 2 − In the next step, we will create another div element with some nested div element or some other nested elements.

Step 3 − In this final step, we will retrieve the stored value inside the both div elements with the help of text() method of jQuery.

Example

The below example will explain how to retrieve the value stored inside a single div element and nested div elements with the help of text() method −

.contain { padding: 10px; display: flex; flex-direction: column; align-items: center; justify-content: center; background-color: gold; } .container { padding: 10px; display: flex; flex-direction: column; align-items: center; justify-content: center; background-color: aqua; } Direct text inside a single div element. var result = $(‘.result’); var singleDivText = $(‘.contain’).text(); var nestedDivText = $(‘.container’).text();

In this example, we retrieved the value stored in the two different div elements with the help of text() method. We selected both the div elements by the classes given to them and then use the text() method to get the value stored in them.

By Using the Html() Method

The html method also works similar to the text() method. The difference between these two methods is that the text() method only gives the text inside the div element. But, html() method also returns the stored value with some extra spaces and line breaks with respect to the type of nested element it contains. We can use the trim() method of jQuery to remove the white spaces around the retrieved value.

Let us understand the use of the html() method to retrieve the stored value inside div element with the help of code example.

The algorithm of this example is similar to the algorithm of the above example, you just need to replace the text() method with html() method to see the use of html() method to retrieve stored value.

Example

In the below example, we retrieve the value stored in the div element with the help of html() method. We can clearly see, that the value inside the div with nested elements is returned with some line breaks, which was not in the case of text() method.

.contain { padding: 10px; display: flex; flex-direction: column; align-items: center; justify-content: center; background-color: gold; } .container { padding: 10px; display: flex; flex-direction: column; align-items: center; justify-content: center; background-color: aqua; } var result = $(‘.result’); var singleDivText = $(‘.contain’).html(); var nestedDivText = $(‘.container’).html();

Conclusion

In this article, we have discussed, how we can retrieve the value stored inside a div element with the help of the html() method and the text() method. We have seen, how both the methods can help us to retrieve the stored value by implementing the practically with the help of code examples for each one of them.

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In The End

So, these were some of the best ways and tools using which you can convert PDF to JPG and vice versa. Do let us know if the above tools have been of use to you. For more such content keep reading Tweak Library. You can also find us on YouTube too!

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Sarang Bhargava

How To Configure Mouse Wheel Speed Across Browsers Using Javascript?

We can use JavaScript to change the behavior of the web page. Every browser has a default scrolling speed when users scroll using the mouse wheel. However, we can control it using JavaScript.

We can also use the mouse wheel to zoom in and out of web pages. In such cases, we require to reduce the mouse wheel speed. Furthermore, developers sometimes require a scrolling speed limit, such as on website rules, so that users can read it properly.

In this tutorial, we will learn different ways to control the mouse’s wheel speed.

Syntax

Users can follow the syntax below to use the ‘wheel’ event to configure mouse wheel speed across browsers using JavaScript.

let deltaY = event.deltaY; content.scrollTop += deltaY / n; });

We take the current scrolling speed using the deltaY property in the above syntax. After that, we divide the current scrolling speed by n to change the scrolling speed. Developers should increase the value of n to decrease the scrolling speed and decrease the value of n to increase the scrolling speed.

Example 1 (Using the Wheel Event)

In the example below, we have created the content div element and added the text content. In CSS, we have set the dimensions of the div element and set the overflow scroll to make the div scrollable.

In JavaScript, we used the addEventListner() method to fire the ‘wheel’ event and get the current scrolling speed. After that, we have decreased the scrolling speed by 50 times. In the output, users can try to scroll through the div element and observe the slow scrolling speed.

#content { height: 300px; width: 300px; overflow-y: scroll; padding: 10px; font-size: 20px; font-family: Arial, sans-serif; background-color: pink; } const content = document.getElementById(“content”); event.preventDefault(); let deltaY = event.deltaY;

let speed = deltaY / 50;

content.scrollTop += speed; }); Example 2 (Using the Mousewheel Event For Chrome Browser)

In the example below, we have used the ‘mousewheel’ event. When users use the mouse wheel to scroll the web page in the Chrome browser, it fires the ‘mousewheel’ event.

Here, we have multiplied the current scrolling speed by 0.03 to decrease the scrolling speed by 97%. However, it is very similar to the ‘wheel’ event.

#content { height: 200px; width: 200px; overflow-y: scroll; padding: 10px; font-size: 60px; font-family: Arial, sans-serif; background-color: aqua; } const content = document.getElementById(“content”); event.preventDefault(); const deltaY = event.deltaY; content.scrollTop += deltaY * 0.03; }); Example 3 (Using the DomMouseScroll Event for Firefox Browser)

In the example below, we have used the ‘DomMouseScroll’ event. The Firefox browser only supports it but not other browsers such as Chrome, opera, etc.

We used the ‘detail’ property of the event to get the current scrolling speed and multiplied it by 0.5 to reduce the scrolling speed by half. Users can open the below web page in the Firefox browser the observe the change in the scrolling speed of the div element.

#content { height: 200px; width: 200px; overflow-y: scroll; padding: 10px; font-size: 40px; background-color: green; } const content = document.getElementById(“content”); event.preventDefault(); const deltaY = event.detail; content.scrollTop += deltaY * 0.5; }); Example 4 (Customizing the Mouse Wheel Speed From the Web Page)

In the example below, we allow users to change the mouse wheel scrolling speed from the web browser. We have created the range slider that takes the input between 1 and 50. Users can change the value of the range slider.

After that, whenever users scroll the div element, JavaScript sets the scrolling speed according to the selected value in the range slider.

#content { height: 200px; width: 200px; overflow-y: scroll; padding: 10px; font-size: 20px; font-family: Arial, sans-serif; background-color: aqua; } const content = document.getElementById(“content”); event.preventDefault(); let value = document.getElementById(“myRange”).value; let deltaY = event.deltaY; deltaY = value; } else if (deltaY < 0) { deltaY = -value; } content.scrollTop += deltaY; });

Users learned to control the mouse wheel scrolling speed across browsers using JavaScript. This tutorial used three events to configure the mouse wheel speed. The first event is the ‘wheel’ event which is compatible with all browsers. The second event is ‘mousewheel’, compatible with all browsers except Firefox. The third event is ‘DOMMouseScroll’, which is only compatible with Firefox.

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