It is useless to mark two frames with IDs, and useful to mark them with names. Query Baidu as follows.

The difference between ID and name in HTML web pages can be said that almost everyone who has done Web development has asked, What is the difference between the element ID and name? Why do I need a name if I have an ID ?! We can also get the most classical answer: ID is like a person's ID card number, and name is like his name. ID is obviously unique, and name can be repeated.

Last week, I also encountered the ID and name problems. I entered an input type = "hidden" on the page and wrote only one id = 'sliceinfo'. After the assignment, I submit it, use request. params ["sliceinfo"] does not return a value. Later, I suddenly realized that the name should be used for marking, so I added a name = 'sliceinfo' to the input, and everything was okay.

The answer to ID and name in the first section is too general. Of course, that explanation is completely correct for ID. It is the identity of the HTML element on the client side. Name is actually much more complex, because name has many purposes, so it cannot be completely replaced by ID, so it is canceled. Specific uses include:

Purpose 1: ID of the server as an HTML element that can interact with the server, such as input, select, textarea, And button. On the server side, we can use request. Params to obtain the value submitted by the element based on its name.
Purpose 2: HTML element input type = 'radio' group. We know that the radio button control is in the same group class. The check operation is mutex and only one radio can be selected at a time, this group is implemented based on the same name attribute.
Purpose 3: Create an anchor in the page. We know that <a href = "url"> link </a> is used to obtain a page hyperlink. If you do not use the href attribute, use name instead, for example, <a name = "pagebottom"> </a>.
Purpose 4: act as the identity of an object, such as applet, object, and embed. For example, in the applet object instance, we will use its name to reference this object.
Purpose 5: When the IMG and map elements are associated, if you want to define the IMG hotspot area, you need to use its attribute usemap, make usemap = "# name" (name of the associated map element ).
Purpose 6: Attributes of certain elements, such as attribute, Meta, And Param. For example, define <Param name = "appletparameter" value = "value"> for an object or <meta name = "author" content = "Dave raggett"> in Meta.

Obviously, these functions are not simply replaced by IDS, so the ID and name of the HTML element are not the same as the ID card number and name, they are actually different things.

Of course, the name attribute of the HTML element can also play a role of ID in the page, because in the DHTML Object Tree, we can use document. getelementsbyname is used to obtain an array of objects containing all the specified name elements on the page. There is another problem with the name attribute. When we dynamically create elements that can contain the name attribute, we cannot simply use the value assignment element. name = "... "to add its name, but must use document. createelement ('<element name = "myname"> </element>') adds the name attribute to the element. What does this mean? You can see the following example.
<SCR limit PT Language = "Limit Cr limit PT">
VaR input = Document. createelement ('input ');
Input. ID = 'myid ';
Input. Name = 'myname ';
Alert (input. outerhtml );
</Scr platinum Pt>

<Input id = myid> is displayed in the message box.

 

<SCR limit PT Language = "Limit Cr limit PT">
VaR input = Document. createelement ('<input name = "myname"> ');
Input. ID = 'myid ';
Alert (input. outerhtml );
</Scr platinum Pt>

<Input id = myid name = myname> is displayed in the message box.
The Design of initializing the name attribute is not a defect of IE, because it is mentioned in msdn. But what is the principle of this design? I do not want to be clear at the moment.

Here, by the way, what if the IDs of n (n> 1) HTML elements on the page are the same? How can we reference them in DHTML objects? If we use the ASPX page, this situation is not easy, because the ASPNET process does not allow non-unique IDs when processing the ASPX page, this is because the page will be thrown an exception and cannot be a normal render. If we want to repeat the ID on a dynamic page, how does ie do it? At this time, we can continue to use document. getelementbyid to get the object, except that we can only get the first object that appears in the HTML render of the objects with duplicate IDs. At this time, duplicate IDs are automatically converted into an array when being referenced. Elements with duplicate IDs exist in the array in order of render.

 

ArticleComment:

In fact, the ID is related to the internal elements of the HTML page and is not related to the content of the page element. The name is more related to the content of the page element.

I looked at the reference. The name also has a function window. name. Can I calculate this as a reference? The most common parameter is the second parameter of windows. Open, which is used in the target of <A>.

IFRAME: also has the name attribute of frame and IFRAME.

The IFRAME name is a bit special. You must use the name when you encountered a problem last time.

I used the onload ()/onclick () in the IFRAME page to change the IFRAME size ~~

Name is the identity of frame, IFRAME & frameset. Is there anything special? The onload ()/onclick () You mentioned means that the name of the frame should be used to reference the frame in it?

for IFRAME, the window object is obtained by using ID directly (but its element object can be obtained by name). I think boynannan should say this is the problem! I don't know whether the prediction is accurate.