Summary of common control methods for jQuery operation forms_jquery

The examples in this article summarize the common control methods of jQuery operating forms. Share it with everyone for your reference. The details are as follows:

The following JS code lists common methods for jQuery to operate common controls on forms (including select, radiobox, checkbox). I believe there must be what you need

HTML code for radio operation

Radion
<input type="radio" name="rd" id="rd1" checked="checked" value="rd1" />
<input type="radio" name="rd" id="rd2" value="rd2" />
<input type="radio" name="rd" id="rd3" value="rd3" />

1. Get the selected value, three methods are available:

$('input:radio:checked').val();
$("input[type='radio']:checked").val();
$("input[name='rd']:checked").val();

2. Set the first Radio as the selected value:

$('input:radio:first').attr('checked', 'checked');

or

$('input:radio:first').attr('checked', 'true');

Note:

attr("checked",'checked')= attr("checked", 'true')= attr("checked",true)

3. Set the last Radio as the selected value:

$('input:radio:last').attr('checked', 'checked');

or

$('input:radio:last').attr('checked', 'true');

4. Set any radio as the selected value according to the index value:

$('input:radio').eq(索引值).attr('checked', 'true');

Index value=0,1,2....
or

$('input:radio').slice(1,2).attr('checked', 'true');

5. Set Radio as the selected value according to the Value value

$("input:radio[value='rd2']").attr('checked','true');

or

$("input[value='rd2']").attr('checked','true');

6. Delete the Radio whose Value is rd2

$("input:radio[value='rd2']").remove();

7. Which Radio to delete

$("input:radio").eq(索引值).remove();

Index value=0,1,2....
If you want to delete the 3rd Radio:

$("input:radio").eq(2).remove();

8. Traverse Radio

$('input:radio').each(function(index,domEle){
//写入代码
});

The following code demonstrates the common operation methods of DropDownList

DropDownList
<select id="sel">
<option value="1" selected="selected">a</option>
<option value="2">b</option>
<option value="3">c</option>
<option value="4">d</option>
<option value="5">e</option>
</select>

1. Get the Value of the selected item:

$('select#sel option:selected').val();

or

$('select#sel').find('option:selected').val();

Get the Text value of the selected item:

$('select#seloption:selected').text();

or

$('select#sel').find('option:selected').text();

2. Get the index value of the currently selected item:

$('select#sel').get(0).selectedIndex;

3. Get the maximum index value of the current option:

$('select#sel option:last').attr("index")

4. Get the length of DropdownList:

$('select#sel')[0].options.length;

or

$('select#sel').get(0).options.length;

5. Set the first option as the selected value:

$('select#sel option:first').attr('selected','true')

or

$('select#sel')[0].selectedIndex = 0;

6. Set the last option as the selected value:

$('select#sel option:last).attr('selected','true')

7. Set any option as the selected value based on the index value:

$('select#sel')[0].selectedIndex =索引值;

Index value=0,1,2....
8. Set the option with Value=4 as the selected value:

$('select#sel').attr('value','4');

or

$("select#sel option[value='4']").attr('selected', 'true');

9. Delete the option with Value=3:

$("select#sel option[value='3']").remove();

10. Which option should be deleted:

$(" select#sel option ").eq(索引值).remove();

Index value=0,1,2....
If you want to delete the 3rd Radio:

$(" select#sel option ").eq(2).remove();

11. Delete the first option:

$(" select#sel option ").eq(0).remove();

or

$("select#sel option:first").remove();

12. Delete the last option:

$("select#sel option:last").remove();

13. Delete dropdownlist:

$("select#sel").remove();

14. Add an option after select:

$("select#sel").append("<option value='6'>f</option>");

15. Add an option in front of select:

$("select#sel").prepend("<option value='0'>0</option>");

16. Traverse options:

$(' select#sel option ').each(function (index, domEle) {
//写入代码
});

The following code demonstrates jQuery’s common methods of operating checkboxes

CheckBox
<input type="checkbox" id="ck1" name="ck" vlaue="1" checked="checked" />
<input type="checkbox" id="ck2" name="ck" vlaue="2" />
<input type="checkbox" id="ck3" name="ck" vlaue="3" />
<input type="checkbox" id="ck4" name="ck" vlaue="4" />

1. Get a single checkbox selected item (three writing methods):

$("input:checkbox:checked").val()

or

$("input:[type='checkbox']:checked").val();

or

$("input:[name='ck']:checked").val();

2. Get multiple checkbox selected items:

$('input:checkbox').each(function() {
if ($(this).attr('checked') ==true) {
alert($(this).val());
}
});

3. Set the first checkbox as the selected value:

$('input:checkbox:first').attr("checked",'checked');

or

$('input:checkbox').eq(0).attr("checked",'true');

4. Set the last checkbox as the selected value:

$('input:radio:last').attr('checked', 'checked');

or

$('input:radio:last').attr('checked', 'true');

5. Set any checkbox as the selected value based on the index value:

$('input:checkbox).eq(索引值).attr('checked', 'true');

Index value=0,1,2....
or

$('input:radio').slice(1,2).attr('checked', 'true');

6. Select multiple checkboxes:
Select the 1st and 2nd checkboxes at the same time:

$('input:radio').slice(0,2).attr('checked','true');

7. Set the checkbox to the selected value based on the Value value:

$("input:checkbox[value='1']").attr('checked','true');

8. Delete the checkbox with Value=1:

$("input:checkbox[value='1']").remove();

9. Which checkbox to delete:

$("input:checkbox").eq(索引值).remove();

Index value=0,1,2....
To delete the third checkbox:

$("input:checkbox").eq(2).remove();

10.遍历checkbox：

$('input:checkbox').each(function (index, domEle) {
//写入代码
});

11.全部选中

$('input:checkbox').each(function() {
$(this).attr('checked', true);
});

12.全部取消选择：

$('input:checkbox').each(function () {
$(this).attr('checked',false);
});

希望本文所述对大家的jQuery程序设计有所帮助。