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Article Introduction：This article provides a solution for pre-selecting an item in a drop-down box based on a database value using HTML and PHP. The main issue addressed is the incorrect setting of the selected attribute on the select element. The article offers correcte

2024-10-21 comment 0  1253

Article Introduction：Element-UI cascading drop-down box custom style tips: find the corresponding CSS class name and accurately modify the style. Use direct overlay styles with caution, and it is recommended to use depth selectors or CSS variables. Avoid breaking component encapsulation, it is better to use CSS variables to indirectly modify styles. Read the official documentation carefully and locate the CSS class name that needs to be modified. If you encounter !important forced style, you can override !important or modify the Element-UI source code (not recommended).

2025-04-07 comment 0  1045

Article Introduction：Customizing the Vue and Element-UI cascading drop-down box template involves the following steps: Understand how the cascading selector works and Vue's slot mechanism. Use scoped-slot in el-cascader to define custom templates. Use node and data variables to get the current node information and the original data. Display data flexibly according to your needs, such as icons or different styles. Note that the data structure complies with Element-UI requirements and use scoped-slot correctly. In conjunction with the state management tool to handle asynchronous data loading. Use browser developer tools to locate issues.

2025-04-07 comment 0  615

Article Introduction：Word forms can be collected by adding drop-down menus and text input boxes. 1. First enable the "Development Tools" tab: click "File" → "Options" → "Custom Ribbon" → check "Development Tools"; 2. Insert the drop-down menu: Select "Drop-down List Content Control" in the "Controls" group of "Development Tools", add options through "Properties" and set the default value; 3. Insert the text input box: Select "Text Content Control" or "Rich Text Content Control" to insert, for user free input; 4. Protect the form: Select "Fill in Form" through the "Restricted Editing" function and enable protection to prevent the format from being modified.

2025-07-28 comment 0  936

Article Introduction：Achieving Custom Highlight Color for HTML Select ElementIn HTML, the element represents a drop-down list. While hovering over the...

2024-11-01 comment 0  721

Article Introduction：Customizing Select Box Options Width and OverflowIn web development, selecting options from a drop-down list can be a valuable feature. However,...

2024-10-29 comment 0  770

Article Introduction：The article shows how to create an Excel drop down that allows users to select multiple items with or without duplicates. Excel has come a long way since its inception and introduces more and more useful features with each new release. I

2025-03-24 comment 0  1084

Article Introduction：The steps to create a fill-in drop-down list in a Word document are as follows: 1. Open the "Development Tools" tab and check "Development Tools" through "File → Options → Custom Ribbon"; 2. Insert the drop-down content control, click the drop-down arrow in the "Development Tools → Controls" area to select "Drop-down list content control"; 3. Edit the drop-down options, click the "Properties" button to add or modify the option content; 4. Set document protection, select "Fill in Form" through "Protect Document" and start forced protection to prevent the format from being changed.

2025-07-06 comment 0  606

Article 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  1131

Article Introduction：To keep a form element consistent in style across different browsers, you must first reset the default browser style. The steps include: 1. Use CSS to reset or normalize.css to clear the default style; 2. Clearly set border, padding, margin, font-family and appearance attributes; 3. Customize the appearance of the input box after removing the native style; 4. Use pseudo-elements and hide the original input box to implement custom check boxes; 5. Make limited style modifications to the select element or use JavaScript to build a custom drop-down menu. These methods can achieve cross-browser consistency, but some complex elements such as select may require additional tool assistance.

2025-06-12 comment 0  1015

Article Introduction：A few months ago, I was working on an application that required me to have a custom select to show things in a certain way. To be explicit, I needed to show the select drop-down this way: "firstName LastName | staffId" I wanted to use a pa

2025-01-06 comment 0  639

Article Introduction：View.js ...

2025-04-05 comment 0  812

Article Introduction：In web development, creating drop-down lists using HTML5 mainly depends on select and option tags. 1. Basic structure: define options by defining the drop-down box; 2. Add default selections: Use selected attribute to set the default options; 3. Group display options: use the classification of options; 4. Optional advanced functions: realize multiple selection through multiple, and control the number of display options through size. These tips can improve form clarity and user experience.

2025-07-19 comment 0  508

Article Introduction：To get the value of the input box, you need to select the element before accessing its value attribute: 1. Use document.getElementById() or document.querySelector() and other methods to select the input element; 2. Read its current value through the .value attribute, which always returns a string. For numeric input, you need to use Number() to convert it. Checked for the check box, and the drop-down box still uses .value to get the selected value. This method is simple and reliable.

2025-08-01 comment 0  683

Article Introduction：To get the selected value of the drop-down box in HTML, you can use 1. to obtain the element using document.getElementById() or querySelector() to access the value attribute; 2. If you need to get the displayed text, you can obtain it through options[selectedIndex].text; 3. To listen to the change event, you can respond to option changes. For example: When the user selects "banana", the value is "2" and the text is "banana". To operate the multi-select box, you need to traverse the selected items and pay attention to the DOM loading order to avoid errors.

2025-07-18 comment 0  491

Article Introduction：To prevent Notepad from automatically adding .txt extensions, wrap the file name in quotes when saving and select All Files in the Save Type drop-down menu. The specific steps are as follows: 1. Enter a quoted name in the file name field of the "Save As" dialog box, such as "config"; 2. Select "All Files" from the "Save Type" drop-down menu to disable the behavior of automatically adding extensions; 3. Note that Windows may hide known extensions. You can check "File Name Extension" in the "View" tab of File Explorer to confirm that the saving is correct. Follow these steps to ensure that Notepad saves files in the specified format without automatically adding the default .txt extension.

2025-07-13 comment 0  418

Article Introduction：v-model is used in Vue to implement bidirectional data binding for form input. 1. The text box binds string values through v-model; 2. The usage of multi-line text boxes is the same as single-line text; 3. The single check box binds boolean values; 4. Multiple check boxes bind the same array to collect selected values; 5. The radio button group binds the same data attribute to record the selected items; 6. The drop-down box supports single-choice and multiple-choice, binding strings or arrays respectively; 7. Provides modifiers such as .trim, .number, and .lazy to handle common input scenarios. The essence is: syntax sugar of value and @input, and can expand behavior in custom components to ultimately realize automatic synchronization of data and views.

2025-07-29 comment 0  921

Article Introduction：The best way to precisely control the style of drop-down menu elements is to use custom components. 1. Create a container div that contains a drop-down trigger and an option list, and completely control its appearance through CSS; 2. The option style of the native select element is limited and only valid in some browsers; 3. Specific styles can be applied to the target item through the attribute selector, but the cross-browser compatibility is poor. Therefore, when highly customized designs are required, it is recommended to prioritize customization solutions for a more consistent user experience.

2025-07-11 comment 0  1002

Article Introduction：The list property of HTML allows the input box to support "drop-down selection custom input", which is suitable for search boxes, form filling, configuration items and other scenarios. 1. It is achieved through association and implementation, and users can freely enter or select suggestions; 2. Pay attention to the good browser compatibility but the style is uncontrollable, the input content is not in the options, multiple selections are not supported, and mobile support is limited; 3. Optimization points include turning off autocomplete, rational layout of datalist, and combining JS dynamic update options to improve the experience.

2025-07-27 comment 0  213

Article Introduction：To create a multi-level drop-down menu in the Bootstrap navigation bar, 1. You need to build a multi-level menu through a nested <ul> structure; 2. Add a custom CSS to control the submenu position, such as setting the relative positioning of .dropdown-submenu and the left offset of .dropdown-menu; 3. Use data-bs-toggle="dropdown" or custom JS to implement the submenu expansion logic, such as clicking to switch the display status; 4. Optimizing mobile interaction, it is recommended to click to expand, limit the levels, and consider using the folded menu to adapt to touch screen operations.

2025-07-21 comment 0  925