jquery dynamically changes form size

In modern web design, responsive design is receiving more and more attention. Pages that display adaptively on different devices can provide a better user experience. One of the important technical points is dynamically changing the size of the form. Today we will talk about how to use jQuery to achieve this function.

Why we need to dynamically change the form size

With the popularity of mobile devices and constant updates and iterations, we often need to adapt some content to the user's device. For example, a web page may want to display one layout on a widescreen TV, but on a mobile phone it should be in a vertical layout and resize to fit the user's viewing area.

Because of the existence of many different factors such as device size and resolution of different users, we cannot determine the size of the page in advance, so we need to dynamically change the window size to adapt to different devices.

Use jQuery to change the form size

jQuery is a very practical Javascript library that simplifies the operation of HTML documents, including some common operations such as changing styles, responding to user operations, etc. wait. Therefore, we can use jQuery to more simply implement the function of changing the window size.

$(window).resize(function(){
  //当浏览器窗口大小变化时，执行以下代码
  var width = $(window).width(); //获取浏览器窗口宽度
  var height = $(window).height(); //获取浏览器窗口高度
  if(width < 768){
    $('body').css('background-color', 'red');
  } else {
    $('body').css('background-color', 'blue');
  }
})

First, we used jQuery's resize() event to detect changes in the browser window size. The code executes automatically when the window size changes.

Next, we used jQuery’s width() and height() methods to obtain the width and height of the current browser window. We can respond to different window sizes accordingly.

In this example, we dynamically change the background color of the web page to red or blue according to the width of the browser window. When the window width is less than 768 pixels, set the background color to red, otherwise set it to blue.

More operations

In addition to changing the background color, we can also do many other things to respond to the user's different devices. For example:

• Modify the size, color and position of text;
• Show or hide certain content blocks;
• Adjust the size and position of pictures;
• Customized style sheets and more.

These operations can help us better display the page on different devices without losing responsiveness due to device fixation.

Notes

Although it is convenient to use jQuery to change the window size, you need to pay attention to the following points when using it:

• Try to avoid changing the window size during the process Doing too many operations in the code will cause unnecessary performance problems;
• Cross-browser compatibility should be considered in the code. Some old browsers may not support certain methods of jQuery;
• When the code that responds to the window size is too complex, we may need to consider whether a specialized responsive framework is needed to assist with implementation.

In short, dynamically changing the window size is a very important technology and plays an extremely important role in responsive design. Using jQuery to implement this function can help us create high-quality web pages more easily and quickly.

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