Summary of jquery's method for getting id values

ID is a unique id of some elements on the html page, including div, input, iframe, etc, the following describes how to use jquery to obtain the id value. For more information, see.

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<Div id = "product_shift_out _ {m}"> </div> <Script language = "JavaScript" type = "text/javascript"> $ (Document). ready (function (){ Name = $ ('div '). eq (0). attr ('id '); Alert (name) }); </Script>

Eq (0) is the first jq element...

 

Eq (index)
Matches an element with a given index value.

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Matches a single element by its index.
Return Value
Element

Parameters
Index (Number): starts from 0.

Example
Find the second row

HTML code:

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<Table> <Tr> <td> Header 1 </td> </tr> <Tr> <td> Value 1 </td> </tr> <Tr> <td> Value 2 </td> </tr> </Table>

JQuery code:

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$ ("Tr: eq (1 )")

Result:

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[<Tr> <td> Value 1 </td> </tr>]

Obtain the values of different IDs

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<Script src = "js/jquery. js"> </script> <Script type = "text/javascript"> <! -- $ (Document). ready (function (){ Var len = $ ("# group span"). size (); // obtain the number of span tags Var arr = []; For (var index = 0; index <len-1; index ++) {// create an array of numbers Arr [index] = index; } $. Each (arr, function (I) {// cyclically obtain values of different IDs Var idValue = $ ("# group span"). eq (I). attr ("id "); If (idValue! = ''){ Alert (idValue ); } }); }); // --> </Script> <Span id = "group"> <Span id = "0_1"> aaa, <Span group_id = "0_1" class = "icon_close"> & nbsp; </span> </Span> <Span id = "0_2"> bbb, <Span group_id = "0_2" class = "icon_close"> & nbsp; </span> </Span> <Span id = "0_3"> ccc, <Span group_id = "0_3" class = "icon_close"> & nbsp; </span> </Span> <Span id = "0_4"> ddd, <Span group_id = "0_4" class = "icon_close"> & nbsp; </span> </Span> <Span id = "0_5"> eee, <Span group_id = "0_5" class = "icon_close"> & nbsp; </span> </Span> </Span> In this way, you will get all the IDs you want: 0_1 0_2 0_3 0_4 0_5

Text Box, text area:

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$ ("# Txt"). attr ("value", ''); // clear the content $ ("# Txt"). attr ("value", '11'); // fill in the content

Multiple selection box checkbox:

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$ ("# Chk1"). attr ("checked", ''); // do not check $ ("# Chk2"). attr ("checked", true); // check If ($ ("# chk1"). attr ('checked') = undefined) // you can check whether the checked has been checked.