How to effectively improve development efficiency: explore the skills and practical application of AJAX selectors

Improve development efficiency: master the skills and practices of multiple AJAX selectors

Introduction:
In modern Web development, use AJAX (Asynchronous JavaScript and XML ) for data interaction has become the norm. As an important part of AJAX operations, selectors are also an indispensable tool for developers. This article will explain different AJAX selectors in detail and provide relevant code examples to help readers better master the skills and practices of AJAX selectors, thereby improving development efficiency.

1. Basic selector
The basic selector is one of the most commonly used selectors in AJAX. It can select the corresponding DOM element through the element's ID, class name or tag name. Here are some common basic selector examples:

1. Select elements by ID selector:

   var element = document.getElementById('element_id');

2. Select elements by class name selector:

   var elements = document.getElementsByClassName('element_class');

3. Select elements through the tag name selector:

   var elements = document.getElementsByTagName('element_tag');

2. Level selector
The level selector is a DOM-based Selector for element hierarchies. It can select DOM elements through the element's parent element, child element or sibling element. Here are some common examples of hierarchical selectors:

1. Selecting child elements through the parent element selector:

   var parent = document.getElementById('parent_element_id');
   var element = parent.querySelector('.element_class');

2. Selecting through the child element selector Parent element:

   var child = document.getElementById('child_element_id');
   var parent = child.parentNode;

3. Select adjacent elements through the sibling element selector:

   var sibling = document.getElementById('current_element_id');
   var prevSibling = sibling.previousSibling;
   var nextSibling = sibling.nextSibling;

3. Filter selector
Filter selector Is a selector that filters based on element attributes. It can select DOM elements by the element's attribute value, attribute name, or attribute presence or absence. Here are some common examples of filter selectors:

1. Select elements by attribute value selectors:

   var element = document.querySelector('[attribute="value"]');

2. Select elements by attribute name selectors :

   var elements = document.querySelectorAll('[attribute]');

3. Select elements through attribute presence or absence selector:

   var elementsWithAttribute = document.querySelectorAll('[attribute]');
   var elementsWithoutAttribute = document.querySelectorAll(':not([attribute])');

4. State selector
The state selector is a A selector that filters based on element state (e.g. selected state, disabled state). It can select DOM elements by their state. Here are some common status selector examples:

1. Selected status selector:

   var selectedElements = document.querySelectorAll(':checked');

2. Disabled status selector:

   var disabledElements = document.querySelectorAll(':disabled');

5. Compound selector
A compound selector is a selector that combines multiple selectors. It can select DOM elements through a combination of multiple selectors. Here are some common examples of compound selectors:

1. Multiple selectors combined selectors:

   var elements = document.querySelectorAll('.element_class, #element_id');

2. Selectors combined with hierarchical selectors Usage:

   var elements = document.querySelectorAll('#parent_id .element_class');

Conclusion:
By mastering the skills and practices of multiple AJAX selectors, developers can select and operate DOM elements more flexibly, thereby improving development efficiency. This article explains basic selectors, hierarchical selectors, filter selectors, state selectors and compound selectors in detail, and provides relevant code examples. I hope it will be helpful to readers in AJAX development. At the same time, developers can also flexibly use AJAX selectors according to their own needs to further optimize the development process and improve user experience.

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