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Javascript Hosting Images – In this tutorial, we will discuss in detail how to rebuild a responsive form using HTML, JavaScript, and Bootstrap 5. We use HTML to structure the web page, Bootstrap to build it, and JavaScript to make the form responsive. We will use external JSON files for the data displayed in our form. We will also host the web page locally using XAMPP software.

The first step to creating a web page is to create a folder to store all the files we need for our web page. Our web form file system will look like this:

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So in our filesystem we have a bootstrap folder called CSS, one HTML file, two JavaScript files, and two JSON files. We need to download bootstrap 5 to add the CSS file to our file system. You can download it by clicking here. After downloading, extract the compressed folder and copy and paste only the CSS folder into the file system. Next, you need to download the jQuery file for our web page. You can download it from here. I have used jquery-2.1.4 for this project.

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An HTML file is required to structure our web page. It forms the basis of our web page. The HTML code for our project is as follows:

This is the complete HTML code for the project. Now let’s take a closer look at each part of the code

HTML code starts with the tag and ends with the tag. It has two parts – head and body. Now let’s look at the main part.

The head section starts with the tag and ends with the tag. It usually contains metadata, that is, information about the HTML document, such as the name of the document. Metadata is usually not displayed.

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Next comes the link tag. The link tag links our HTML to an external file, usually a CSS file. So we use the link tag to link to our bootstrap file. The link tag has an attribute called rel. The rel attribute specifies the link between our HTML document and the external file. That’s why we assign it as a “style sheet”. Next, we use the href attribute to specify the path to the CSS file. Since the folder is in our file system, we don’t need to specify its full path. Our project needs a bootstrap.css file so we can specify the path as css/bootstrap.css.

The body section starts with the tag and ends with the tag. It consists of all the content on our HTML page, i.e. headings, paragraphs, images, etc.

We use the script tag to add an HTML document to our external JavaScript files. The type attribute specifies the file type, where it is a JavaScript file. The src attribute is used to specify the path to our JS files. Since our files are in the file system itself, a filename with a .js extension is sufficient. In the next section, we’ll take a closer look at the contents of the index.js file.

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Next, we start with the main content of our web page using the

tag. The div tag is used to define a part of our web page. This container will be used for the name of our form. The div tag contains the class attribute. We can use the class attribute to build the content inside the div container. Here we use a class called container-lg. This is a predefined bootstrap class and we use it to set the size of the container. We then initialize another div tag with the class text center.

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This class aligns with the header in the center of the page. Next we add

mark for a line break. Because there is no content for

tag, we don’t need to use a closing tag, that is, it is a self-closing tag. Then we type the title in the

tag. HTML provides us with heading sizes from

to

. Next, we use the

paragraph element to write the text below the heading. We use the leading class to add a little emphasis to the text. Finally, we close the container using the

tag.

Next, we start with the content of our form. Our form needs to create a div container. We use the class line justify-content-center my-4 to center the content and add padding to the top and bottom. Then in the next div container we set the class to col-lg-6. It is used to specify the column size and indicates a large column.

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We then launch the form using the tag. We use the onSubmit attribute to define the action taken when the form is submitted. So we call a function called saveFile() (will be discussed in the JS section). Then set the name of the form to “webform”. We used mt-1 border p-5 pb-4 bg-light shadow to add padding and define the borders of our shape.

We will use drop down menus in our form. In the first drop-down menu, you must select the student’s name. So we use the label element to set the label of the dropdown menu. The for attribute is used to associate the tag with the ID of the dropdown menu. The ID of the first dropdown menu is mylist1. We use the form-label class for the label tag. The tag is used to create a dropdown list. We use the required keyword to indicate that an option must be selected before submitting the form. In the dropdown list, we set the ID to mylist1 and the name to STUDENT. We also use the bootstrap class form-select to build the form.

Next, we use the tag to define the options. We need to create a default option, so we leave the value attribute empty to create one. Doing so will require the user to select an option before submitting the form (they cannot submit the form with the default option).

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NOTE. We don’t hardcode the options, but instead get the option data from an external JSON file (discussed in the following sections).

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Also, we need to create two more dropdowns, one for Roll Number and one for State/UT.

After creating the dropdowns, we need to create two buttons – Submit and Reset. We create this using an tag of type Submit. Creates a submit button that provides all the form data. The action taken is controlled by the function specified in the onSubmit attribute of the form tag (discussed above). Similarly, we use the Reset input tag to create a reset button. This button returns all selected options to their default options. We use btn’s btn-secondary class to create the buttons.

Finally, at the end of the form, we note the copyright by using the symbol © after the name of the organization.

Now that we’ve reviewed our HTML file, let’s take a look at the contents of the index.js file. The full code is as follows:

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So we use the getJSON function to get the data from our JSON file. We named the file names.json. So we will get the student names and roll numbers from the JSON file. We take the roll numbers from the ID values ​​and the names from the name value specified in our JSON file.

Note that the list is named mylist1 in the names.json file. Below is the content of the JSON file for your reference.

So first we create two variables select and select2 and assign them to our first and second dropdown using their unique IDs. For this we use the document.getElementById() function.

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Now we’ll go through the contents of the JSON file to add them one by one to our dropdown menu. A for loop is used for this purpose. We can get the content length using data[‘mylist1’].length. Inside the loop, we create an HTML option element using document.createElement(“OPTION”) and assign it to the variable option.

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Next, we create a text node (for the text to be specified in the select element) using the document.createTextNode() function and pass the names from the JSON file as an argument. We assign the text node to the txt variable.

Once that’s done, we need to add text to our selections. We use the .appendChild() function to append text to our options. We then use the .insertBefore() function to insert the text node before the reference node.

Similarly, we create options for the roll number dropdown menu. The content of the JSON file is as follows:

In the third dropdown (stats/UT) we need to get the data from our second JSON file called states.json.

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The code for this is the same as before, we just need to change the variable names and id. The content of the JSON file is appended below:

We talked about it in the previous part

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