How to use iframe in html?-HTML Tutorial-php.cn

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How to use iframe in html?

青灯夜游

Sep 13, 2018 pm 04:14 PM

cssiframe

This chapter will introduce how to use iframe in html, so that everyone can understand the use of iframe in html. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

Some people say that iframe is the element with the highest energy consumption, so use it as little as possible; others say that the security of iframe is too poor, so use it as little as possible. While what they say is true, the power of iframes cannot be ignored, and there is no shortage of companies using it right now. The

tag specifies an inline frame. An inline frame is used to embed another document within the current HTML document.

All major browsers support the tag. You can put the prompt text inside <iframe> and , so that browsers that do not support will have the prompt text appear.

How to use iframe?

Usually we use iframe to directly embed the src specified by the iframe tag on the page.

For example:

<!-- <iframe> 标签规定一个内联框架　　　　　
     这里写p 标签是为了看align的效果 -->
     <p style="overflow: hidden;">这是一些文本。 这是一些文本。 这是一些文本。这是一些文本。 这是一些文本。 这是一些文本。
         <iframe name="myiframe" id="myrame" src="external_file.html" frameborder="0" align="left" width="200" height="200" scrolling="no">
            <p>你的浏览器不支持iframe标签</p>
        </iframe>
     这是一些文本。 这是一些文本。 这是一些文本。这是一些文本。 这是一些文本。 这是一些文本。</p>

Commonly used attributes of iframe:

Name: Specifies the name of . <br> width: Specifies the width of <iframe>. <br> Height: Specifies the height of <iframe>. <br> src: Specifies the URL of the document displayed in <iframe>. <br> Frameborder: Specifies whether to display the border around <iframe>. (0 means no border, 1 bit has border). <br> align: Specifies how to align <iframe> based on surrounding elements. (left,right,top,middle,bottom). <br> scrolling: Specifies whether to display scroll bars in <iframe>. (yes,no,auto)

The src attribute of the iframe in the above code is a local html page

The code is as follows:

<body>
    <div id="div" style="height: 300px; background: #ddd;">这是一个外部文件里面的内容</div>
</body>
<script>
    var div = document.getElementById("div");
    console.log(div);
</script>

Any interactive parts are also written in this page, and the iframe will be automatically transferred to the imported page.

So how to get the content inside the iframe?

var iframe = document.getElementById("myrame"); //获取iframe标签
var iwindow = iframe.contentWindow; //获取iframe的window对象
var idoc = iwindow.document; //获取iframe的document对象
console.log(idoc.documentElement); //获取iframe的html
console.log("body",idoc.body);

However, the DOM inside cannot be obtained. It can be obtained from the URL (that is, the imported html file )

Advantages and disadvantages of iframe

Advantages:

No need to reload the page To load the entire page, you only need to reload one frame page in the page (reduce data transmission and reduce the loading time of the web page);

The technology is simple and easy to use, and is mainly used for pages that do not require search engines to search. ;

It facilitates development and reduces the duplication rate of code (such as the header and footer of the page);

Disadvantages:

It will generate a lot of pages. Not easy to manage;

Not easy to print;

Multi-frame pages will increase service HTTP requests;

The browser's back button is invalid, etc.;

The above is the detailed content of How to use iframe in html?. For more information, please follow other related articles on the PHP Chinese website!

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