Summary of usage of the method of obtaining id value in jquery

ID is that some elements in the html page can have a unique id for this page, including p, input, iframe, etc. Now I will introduce to you how to use jquery to get the id. Value method, friends who need to know can refer to

The code is as follows:

<p id="product_shift_out_{m}"> </p>
<script language = "
JavaScript
" type="text/javascript">
$(
document
).ready(function(){
name = $(&#39;p&#39;).eq(0).attr(&#39;id&#39;);
alert(name)
});
</script>

eq(0) is to take the first jq element. . .

eq(index)
Matches an element with a given index value

Matches a single element by its index.
Return value
Element

Parameters
index (Number): Count from 0

Example
Find the second line

HTML code:

The code is as follows :

<table>
<tr><td>Header 1</td></tr>
<tr><td>Value 1</td></tr>
<tr><td>Value 2</td></tr>
</table>

jQuery code:

The code is as follows:

$("tr:eq(1)")

Result:

The code is as follows:

[a34de1251f0d9fe1e645927f19a896e8b6c5a531a458a2e790c1fd6421739d1cValue 1b90dd5946f0946207856a8a37f441edffd273fcf5bcad3dfdad3c41bd81ad3e5 ]

Get the values ​​of different ids

The code is as follows:

<script src="js/jquery.js"></script>
<script type="text/javascript">
<!--
$(document).ready(function(){
var len = $("#group span").size();//获取span标签的个数
var arr = [];
for(var index = 0; index < len-1; index++){//创建一个数字
数组
arr[index] = index;
}
$.each(arr, function(i){//
循环
得到不同的id的值
var idValue = $("#group span").eq(i).attr("id");
if(idValue != &#39;&#39;){
alert(idValue);
}
});
});
//-->
</script>
<span id="group">
<span id="0_1">aaa,
<span group_id="0_1" class="icon_close"> </span>
</span>
<span id="0_2">bbb,
<span group_id="0_2" class="icon_close"> </span>
</span>
<span id="0_3">ccc,
<span group_id="0_3" class="icon_close"> </span>
</span>
<span id="0_4">ddd,
<span group_id="0_4" class="icon_close"> </span>
</span>
<span id="0_5">eee,
<span group_id="0_5" class="icon_close"> </span>
</span>
</span>

This will get all the ids you want:
0_1
0_2
0_3
0_4
0_5

Text box, text area:

The code is as follows:

$("#txt").attr("value",'');//清空内容
$("#txt").attr("value",'11');//填充内容

Multiple selection box checkbox:

The code is as follows:

$("#chk1").attr("checked",'');//不打勾
$("#chk2").attr("checked",true);//打勾
if($("#chk1").attr('checked')==undefined) //判断是否已经打勾

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