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Course Introduction：Core points jQuery provides a variety of methods to manipulate drop-down boxes, including adding, removing, and changing options using methods such as append(), remove() and val(). Be sure to use the $() function to select the drop-down box before applying any method. To get the current value of the selected option, use the val() method. You can use the text() method to get the text of the selected option. Multiple values ??can be retrieved using the each() function. The onChange event in jQuery can be used to identify the selected options in the drop-down box. This event triggers a function that looks for the text of the selected option. Introduction Operating the drop-down box in jQuery requires

2025-03-05 comment 0  1129

Course Introduction：Generating a Drop Down List of Timezones with PHPIntroductionDisplaying the correct date and time is crucial for any website. One challenge is providing a way for users to select their preferred timezone during registration. This article will explore

2024-10-19 comment 0  720

Course Introduction：Setting Selected Drop-Down Option by Text Description with jQueryIn the realm of web development, selecting an element within...

2024-11-03 comment 0  921

Course Introduction：How to set text color gradient in PS: Create text layer: Enter text using the Text Tool (T). Open the Gradient Editor: Select Gradient from the Window menu. Select Gradient Type: Select Linear, Radial, or Angle types from the drop-down menu. Set gradient color: Click gradient to stop selecting color. Adjust Gradient Position: Use sliders or numeric fields to adjust the position. Apply Gradients: Click the OK button to apply changes. Save changes: Save the file to apply a gradient effect.

2025-04-06 comment 0  318

Course Introduction：To ensure that the user must select an option from the drop-down menu in the HTML form, use the required property to implement required verification. 1. Add required attribute to the tag, 2. Set the first value to an empty string to trigger verification failure, 3. You can simulate the placeholder effect through disabled and selected, 4. If you need more flexible control, you can manually judge the selected value by JavaScript. Correctly setting the null value option is the key to ensuring validation takes effect.

2025-07-11 comment 0  124

Course Elementary  13772

Course Introduction：Scala Tutorial Scala is a multi-paradigm programming language, designed to integrate various features of object-oriented programming and functional programming.

Course Elementary  82280

Course Introduction："CSS Online Manual" is the official CSS online reference manual. This CSS online development manual contains various CSS properties, definitions, usage methods, example operations, etc. It is an indispensable online query manual for WEB programming learners and developers! CSS: Cascading Style Sheets (English full name: Cascading Style Sheets) is an application used to express HTML (Standard Universal Markup Language).

Course Elementary  13144

Course Introduction：SVG is a markup language for vector graphics in HTML5. It maintains powerful drawing capabilities and at the same time has a very high-end interface to operate graphics by directly operating Dom nodes. This "SVG Tutorial" is intended to allow students to master the SVG language and some of its corresponding APIs, combined with the knowledge of 2D drawing, so that students can render and control complex graphics on the page.

Course Elementary  24590

Course Introduction：In the "AngularJS Chinese Reference Manual", AngularJS extends HTML with new attributes and expressions. AngularJS can build a single page application (SPAs: Single Page Applications). AngularJS is very easy to learn.

Course Elementary  27446

Course Introduction：Go is a new language, a concurrent, garbage-collected, fast-compiled language. It can compile a large Go program in a few seconds on a single computer. Go provides a model for software construction that makes dependency analysis easier and avoids most C-style include files and library headers. Go is a statically typed language, and its type system has no hierarchy. Therefore users do not need to spend time defining relationships between types, which feels more lightweight than typical object-oriented languages. Go is a completely garbage-collected language and provides basic support for concurrent execution and communication. By its design, Go is intended to provide a method for constructing system software on multi-core machines.