type=”image”和type=”submit”的区别

最新推荐文章于 2022-07-14 16:54:28 发布
转载 最新推荐文章于 2022-07-14 16:54:28 发布 · 694 阅读 · 0
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#js

本文探讨了使用input type=image作为表单提交按钮的方法及其实现原理，对比了其与type=submit的区别，并提出了优化建议。


参考文章  http://blog.dmtuan.com/?p=122


最近发现有些网站使用input的type=”image”来作为提交表单的图片按钮。
虽然type=”image”和type=”submit”都可以相应回车，并且都能提交。
不过type=”image”的input会提交点击坐标x,y。事实上这个type的发明并不是用在做提交按钮上的，他独特的作用是获取图片上的点击坐标，并且提交。
另外他和type=”submit”是一样的，所以经常会有人问，为什么type=”image”会提交两次，事实上把他当成submit处理就可以了。
我的建议是使用input type=”submit”或者button type=”submit”来做，图片则使用背景，这样可以通过css sprites来减少http请求。
文字则可以用text-indent或者line-height来隐藏。



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When clicked, this type of input submits form data just like any other submit button. #### Basic Syntax The basic syntax for using an image input looks like: ```html <input type="image" src="URL_of_image" alt="Description"> ``` This code snippet defines an image button where users click on it to perform actions such as submitting information from web pages[^1]. #### Example Code Snippet Below is an example demonstrating how one might set up an image-based submission mechanism inside a simple contact form: ```html <form action="/submit_form" method="post"> Name: <input type="text" name="name"><br> Email: <input type="email" name="email"><br> <!-- Using an image instead of standard submit button --> <input type="image" src="img_submit.gif" alt="Submit Form"> </form> ``` When someone clicks on the specified graphic (`img_submit.gif`), all entered details will get sent off according to what has been defined by the surrounding `<form>` tag's properties. #### Additional Attributes Besides `src` and `alt`, several additional attributes may enhance functionality further when working with these elements: - **Form**: Specifies which form(s) the input field belongs to. - **Height/Width**: Sets dimensions explicitly rather than relying solely upon natural size settings provided via linked graphics files themselves. - **Name**: Assigns names so servers know exactly what was pressed during submissions involving multiple images acting similarly yet distinctly enough not only visually but also programmatically speaking too! 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