In the past, we used js to read your current cursor. Next we will introduce how to use the text domain cursor in jquery to select, add, delete, and obtain the cursor, for more information, see.
Functions and usage of the extension for text fields:
1. Obtain the cursor position: $ (elem). iGetFieldPos ();
2. Set the cursor position: $ (elem). iSelectField (start );
3. Select the characters in the specified position: $ (elem). iSelectField (start, end );
4. Select the specified character: $ (elem). iSelectStr (str );
5. Insert a string after the cursor: $ (elem). iAdd (str );
6. Delete n characters before (-n) or after (n): $ (elem). iDel (n );
| The Code is as follows: |
Copy code |
; (Function ($ ){
/*
* Cursor operations in text fields (selection, addition, deletion, and retrieval)
*/
$. Fn. extend ({
/*
* Obtain the cursor position
*/
IGetFieldPos: function (){
Var field = this. get (0 );
If (document. selection ){
// IE
$ (This). focus ();
Var sel = document. selection;
Var range = sel. createRange ();
Var dupRange = range. duplicate ();
DupRange. moveToElementText (field );
DupRange. setEndPoint ('endtoend', range );
Field. selectionStart = dupRange. text. length-range.text.length;
Field. selectionEnd = field. selectionStart + range. text. length;
}
Return field. selectionStart;
},
/*
* Select characters in the specified position | set the cursor position
* --- Select from start (including start) to end (excluding end)
* --- If the end value is not entered, the cursor position is set (after the start character)
*/
ISelectField: function (start, end ){
Var field = this. get (0 );
// If the end is not defined, the cursor position is set.
If (arguments [1] = undefined ){
End = start;
}
If (document. selection ){
// IE
Var range = field. createTextRange ();
Range. moveEnd ('character ',-$ (this). val (). length );
Range. moveEnd ('character ', end );
Range. moveStart ('character ', start );
Range. select ();
} Else {
// Non-IE
Field. setSelectionRange (start, end );
$ (This). focus ();
}
},
/*
* Select the specified string
*/
ISelectStr: function (str ){
Var field = this. get (0 );
Var I = $ (this). val (). indexOf (str );
I! =-1? $ (This). iSelectField (I, I + str. length): false;
},
/*
* Insert a string after the cursor
*/
IAddField: function (str ){
Var field = this. get (0 );
Var v = $ (this). val ();
Var len = $ (this). val (). length;
If (document. selection ){
// IE
$ (This). focus ()
Document. selection. createRange (). text = str;
} Else {
// Non-IE
Var selPos = field. selectionStart;
$ (This ). val ($ (this ). val (). slice (0, field. selectionStart) + str + $ (this ). val (). slice (field. selectionStart, len ));
This. iSelectField (selPos + str. length );
};
},
/*
* Delete n characters before (-) or after (+) the cursor.
*/
IDelField: function (n ){
Var field = this. get (0 );
Var pos = $ (this). iGetFieldPos ();
Var v = $ (this). val ();
// If the value is greater than 0, the backend is deleted. If the value is smaller than 0, the front is deleted.
$ (This). val (n> 0? V. slice (0, pos-n) + v. slice (pos): v. slice (0, pos) + v. slice (pos-n ));
$ (This). iSelectField (pos-(n <0? 0: n ));
}
});
}) (JQuery ); |
