![]() ![]() ![]() Let's say you have a CSS class where you set the font style to bold, but you want to dynamically change the color to red based on input from the user. You can also retrieve the current classes for an element using the "css" method. You can also add and remove classes using jQuery. With CSS, you set classes for specific elements in the DOM. These attributes are changed when the function is called. Notice that the first parameter is the "href" property. The above function uses the link's ID specifier to change the link's URL. We don't have anything special to configure the link, but we can use the following jQuery code to change the link href. The above link points to Google's home page. First, you need a link in your HTML page. You can use jQuery to dynamically edit the link. Remember that using the type selector references all elements of that type on the page, but the ID selector narrows down your query to just one element.įor instance, suppose you want to change a link element's href property. The most common way to reference a link object is to use a class or ID selector since you usually have more than one link on a page. We already showed you how to use selectors, but it's important to use the right one to grab the right object on the page.įor a link element, you can reference it using either a class selector, a type selector or an ID selector. Remember that every HTML element is a part of the DOM, and you can query for the specific element using a jQuery selector. The "attr" method is used to change attributes in an object such as a link element. ![]() You'll need to know these basic methods and queries to work with any page in jQuery.Īnother common procedure you will find in web design projects is changing attributes based on user input. These three methods are used to do basic manipulations of the DOM. The val method can be used to set a default value or a value based on user input. This method is used to insert values into form elements. The final statement uses the "val" method. This method inserts HTML and text, so your content is also formatted using HTML tags. Both the text and html methods are covered more in the next chapter. Notice that it has HTML formatting included. ![]() The second statement inserts HTML into the div2 container. This method only inserts plain text without any HTML formatting. The div1 container has text inserted using the "text" method. In all three of these statements, jQuery methods manipulate an attribute or a property for an element. $("#frmInput").val("This function inserts a value into a form text box.") }) $("#div2").html("This function inserts HTML into the container.") $("#div1").text("This function places text in the container.") The following jQuery code manipulates all three elements included in the above HTML code. If you want to reference these three elements, you use selectors. However, we just used an input text box to illustrate the object model. Normally, the input text box would be a part of a parent form element, which makes it a child element. You have two div containers named div1 and div2. The above code is something you could have in a standard web page. Of course, you also have the opening and closing HTML tags, the body tag and the head tag in a standard HTML page. In the HTML above, there are three elements in the DOM object. It's a structured object model that gives you the ability to reference elements in your page. The DOM represents every element in your web page except for text. This article describes the DOM and different configurable elements throughout a page. Before you can start referencing elements, you need to understand the DOM and what you can do to manipulate different elements throughout the page. It's what you use the reference any element whether it's in jQuery, HTML, CSS or any other language. It's the model that represents page elements in an HTML document. Your code can then use that ID to retrieve any details it needs from the products table.We've mentioned the document object model (DOM) before. You should pass just the product ID to the server code. Instead of copying the product details to the order line, you should be using a foreign key relationship between the order line and product tables. You're also not passing the product ID, so I suspect your database structure is broken. As it stands, the user can simply use their browser's developer tools to change the price of the product before clicking the "Buy" button, and it looks like your code will simply accept the new price without validating it. On click of each buy i want to retrieve that div content and pass those to next page through ajax ![]()
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