jquery Determines if checkbox is selected

Parameter description:

1.checkName: Indicates the name value of the check box

2.updateFile: Indicates that the database needs to manipulate the field, the project needs to update a field, so this place is the need to update the field, can be changed depending on the situation

3.formName: Represents the name value of the page form, if the program is written in the page, you can directly write the name value of the form, such as Form NAME=FORM2, you can form2.action= xxx; Form2.submit ();

But if you put the program in an external JS file, you need to get the form DOM element in the page

Note: The 1.jquery version is Jquery-1.7.2.js

2. Some programs are checked for. attr ("checked") ==true judgment, but may be a jquery version problem, not available, can be alert ((Get checkbox) when used. attr ("checked"); see what value

3. Remember that you cannot get the value in input if you set enctype= "Multipart/form-data" in the form

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function deletestring (checkname,updatefile,formname)

{

var deletestring= "";

var checklength=$ (": Checkbox[name=" +checkname+ "]"). Lengh;

for (Var i=0;i<checklength;i++)

{

if ($ (": Checkbox[name=" +checkname+ "]:eq (" +i+ ")"). attr ("checked") = = "Checked")

{

deletestring+=$ (": Checkbox[name=" +checkname+ "]:eq (" +i+ ")"). Val () + ",";

}

}

if (deletestring== "")

{

Alert ("No check Value");

return false;

}

Else

{

Deletestring=deletestring.substring (0,deletestring.length-1);

if (window.confirm ("OK delete") ==true)

{

$ ("form[name=" +formname+ "]") [0].action= "xxxxxxx?deletestring=" +deletestring+ "&updatefile=" +updateFile;

$ ("form[name=" +formname+ "]") [0].submit ();

}

}

}

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