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1. Remove space before and after string
2. Option can only define value values? What other values can be added.
3. Dom and jquery object conversions
1.
Remove spaces before and after string
AskYou can add custom property values casually! Such as:
<option value= "AAAA" tvalue= "bbbbb" ttaction= "CCCCCCCC" >aaaaa</option>
Chase AnswerWhat about the acquisition? How to get its individual values:
AskUse JS to take the value, and take the same as value!
Chase Answer<select id= "Getval" ><option value= "0" id= "1" title= "Heading 1" ></option></select>
function GetSel ()
{document.getElementById (' getval '). Value;
document.getElementById (' Getval '). ID;
document.getElementById (' Getval '). Title;}
That's what it looks like.
Ask<select id= "Getval" >
<option value= "0" id= "1" title= "Title 1" tv= "Test 1" > Test title </option>
</select>
<input type= "button" value= "value See" onclick= "GetSel ()" >
<script>
function GetSel () {
var Obj=document.getelementbyid ("Getval");
alert (obj.options[obj.selectedindex].id);
alert (obj.options[obj.selectedindex].title);
Alert (Obj.options[obj.selectedindex). TV);
alert (Obj.options[obj.selectedindex].value);
}
</script>
Oh.. Yes, thanks a few. Hard for you.
(ext: https://zhidao.baidu.com/question/312091783.html)
2. Option can only define value values? What other values can be added.
The trim () method of the string is to remove spaces before and after the string, such as:
String str = "a bcdef";
str = Str.trim ();
System.out.println (str);
The result of the output is: a bcdef
But I want to get rid of a bcdef behind the space, the front of the space is not removed, how to do?
Workaround:
String str = "a bcdef";
String temp = ("A" + str). Trim (). substring (1);
SYSTEM.OUT.PRINTLN (temp);
The output is: [][][][]a bcdef
After this solution, I can also remove the space in front of a bcdef, the following space is not removed :
String str = "a bcdef";
String temp = (str+ "A"). Trim ();
String Temp2 = temp.substring (0,temp.length ()-1);
System.out.println (TEMP2);
The result of the output is: a bcdef[][][][] Note: [] represents a space
Ext.: http://blog.csdn.net/derpvailzhangfan/article/details/1782628
3. Dom and jquery object conversions
<! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" "HTTP://WWW.W3.ORG/TR/HTML4/LOOSE.DTD" >
<meta http-equiv= "Content-type" content= "text/html; Charset=utf-8 ">
<title>insert title here</title>
<script src= ". /js/jquery-1.11.0.min.js "></script>
<body>
<input type= "text" id= "username" value= "Jack"/>
</body>
<script>
Dom >>>>jquery $ (DOM object)
1. Get DOM objects
var Obj=document.getelementbyid ("username");
2. Conversions
var $user =$ (obj);
Alert ($user. Val ());
Alert ($user. Value);
Jquery>>>>dom
1. Get jquery Exclusive
var $u =$ ("#username");
2. Conversion
2.1 Way 1
var obj= $u. Get (0);
2.2 Way 2
var obj = $u [0];
alert (Obj.value);
</script>
Do you want to define value only if you remove the space and the option string? What other values can be added. Dom and jquery object conversions.
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