jquery Action Radio box, check box, Drop-down list Implementation code _jquery

1, check box selection operation: In fact, is the use of jquery selector, dot I view the jquery selector
HTML code:

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<form>
The sports you love are:
<input type= "checkbox" Name= "Item" value= "Football"/> Football
<input type= "checkbox" Name= "Item" value= "basketball"/> Basketball
<input type= "checkbox" Name= "Item" value= "Badminton"/> Badminton
<input type= "checkbox" Name= "Item" value= "Pingpong"/> pingpong
<input type= "button" id= "Checkall" value= "Select All"/>
<input type= "button" id= "Checkfootball" value= "Selected football"/>
</form>

Jquey JS Script:

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$ (' #checkAll '). Click (Checkall); Select All
$ (' #checkFootball '). Click (Checkfootball); Single-Choice Football
});
function Checkall ()
{
$ (' Input [type= ' checkbox '][name= ' item '] '). attr ("Checked", true);
$ (' [name= ' item ']:checkbox '). attr ("Checked", true);
}

Note: The full counter only needs to replace true here with false.
Select Soccer Action
Jquey JS Script:

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function Checkfootball ()
{
$ ("[name= ' Item ']:checkbox"). each (function () {
if (this.value = = ' Football ')
{
This.checked = true;
}
})
}

Note: Specific purpose in order to solve from the background to remove data, display. The attr () and Val () methods of jquery are not used to set the value of the current checkbox by using the JavaScript native Dom method, which is more efficient than creating the jquery object
2. Radio button operation
HTML code:

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A B C D you choose which one:
<input type= "Radio" name= "Item" value= "A"/>a
<input type= "Radio" name= "Item" value= "B"/>b
<input type= "Radio" name= "Item" value= "C"/>c
<input type= "Radio" name= "Item" value= "D"/>d
<input type= "button" id= "Getletter" value= "Get the letter"/>

Initialize selected letter B
Jquey JS Script:

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$ (document). Ready (function () {
Data initialization selection B.
$ (' [name= ' item ']:radio '). each (function () {
if (this.value = = ' B ')
{
This.checked = true;
}
});
Binding events that get letters
$ (' #getLetter '). Click (Getletter);
});

Get the selected letter
Jquey JS Script:

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function Getletter ()
{
Alert (' The letter obtained is: ' + $ (' [name= ' item '][checked=true]:radio '). Val ());
}

3. Dropdown box (list) operation

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<select multiple id= "choose" style= "width=100px;heigth=160px" ></select>
<input id= "addoptions" type= "button" value= "Add Data"/>
<input id= "getselectedoption" type= "button" value= "Get selected value"/>
<input id= "clearoptions" type= "button" value= "Empty list"/>

Jquey JS Script:

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$ (document). Ready (function () {
$ (' #addOptions '). Click (addoptions); Add an element to a list
$ (' #getSelectedOption '). Click (getselectedoption); Get the selected element
$ (' #clearOptions '). Click (clearoptions); Clear the elements in the list
$ (' #addOptions '). Click (); Trigger adds an element event to the list
});

Append element
Jquey JS Script:

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function AddOptions ()
{
var Selectcontainer = $ (' #choose ');
for (var i = 0; i < 5; i++)
{
var option = $ (' <option></option> '). Text (' Choose ' + i). val (i);
Selectcontainer.append (option);
}
}

Get the selected element

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function Getselectedoption ()
{
* * Eject each element individually
var options = $ (' #choose > option:selected ');
$.each (options, function () {
Alert (' option: ' + this.value);
});
/* Eject each element one by one, the first type of shorthand * *
$ (' #choose > option:selected '). each (function () {
Alert (' Option2: ' + this.value);
});
Pop-up data directly, if the Drop-down box, then directly pop-up data, if it is a list and select a number of
According to, the data is separated by ', ' to show
Alert (' val: ' + $ (' #choose '). Val ());
}

Empty list

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function Clearoptions ()
{
$ (' #choose '). empty ();
}

Commonly used in:

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var DDL = $ ("#ddlDiaryType option:selected"). Text ()//Drop-down table
var reb = $ ("#RbIfprivate [Checked=true]:radio"). Val ();//Radio Box