Some details of document.getElementById_javascript skills

① document.getElementById sometimes grabs the name but misses the id. It is said to be a BUG of IE;
http://community.csdn.net/Expert/topic/4223/4223888.xml?temp=.1947443

The page contains

program code




One is name="category_id" and the other is id="category_id"
Use document.getElementById to get the second one, but , but what is obtained is the first name=category_id
In IE, getElementById does not grab the id first but first finds the object with the same name...

Two forms, each form has two A textbox. The textboxes in the two forms have the same name, but different ids...
This is no problem in Firefox... but in IE, only the first name data that appears is captured

The following code can verify this result

<title> getElementById </title> <form method="POST" action="" name="frm1"> <input type="text" name="tbxuid" id="tbxuid1"> <input type="text" name="tbxpwd" id="tbxpwd1"> </form> <form method="POST" action="" name="frm2"> <input type="text" name="tbxuid" id="tbxuid"> <input type="text" name="tbxpwd" id="tbxpwd"> <input type="button" value="檢查" name="btnchk" onclick="chkacc();"> </form>

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② in javascript The use of getElementbyId
The elements in the web page must have an id attribute before they can be obtained through this method, such as


③ There are two main ways to obtain html tags, one is through the ID value, and the other is through the name attribute
The name attribute is mainly used for the input tag in the form