使用jquery获取keyup位置 [英] Get keyup position using jquery
问题描述
可能存在重复:
如何在textarea中获取插入符号位置?
如果我在html textarea控件的任何地方输入*,我需要获取keyup事件的当前位置,如Welcome * to jQuery
。所以我有*后欢迎意味着在第8位。让我知道是否有人可以帮助我。
这会起作用。 (注意:引号是7时的8位)
$(#tf)。on('keyup', function(){
console.log($(this).val()。indexOf('*'));
});
http://jsfiddle.net/Vandeplas/ hc6ZH /
更新:多个解决方案*
<$ p $ ('keyup',function(){
var pos = [],
lastOc = 0,
p = $($#$) (this).val()。indexOf('*',lastOc);
while(p!== -1){
pos.push(p);
lastOc = p +1;
p = $(this).val()。indexOf('*',lastOc);
}
console.log(pos);
} );
http://jsfiddle.net/Vandeplas/hc6ZH/1/
更新: 仅给出您刚输入的* char的位置
(function($,undefined){
$ .fn.getCursorPosition = function(){
var el = $(this).get(0) ;
var pos = 0;
if('elStart'in el){
pos = el.selectionStart;
} else if('document'in document){
el.focus();
var Sel = document.selection.createRange();
var SelLength = document.selection.createRange()。text.length;
Sel.moveStart('character',-el.value.length);
pos = Sel.text.length - SelLength;
}
返回pos;
}
})(jQuery); ('keypress',function(e){
var key = String.fromCharCode(e.which);
if(key)
$(#tf)。 ==='*'){
var position = $(this).getCursorPosition();
console.log(position);
} else {
return false;
}
});
Possible Duplicate:
How to get caret position in textarea?
If i type * in anywhere in the html textarea control i need to get the current position on keyup event like "Welcome* to jQuery"
. So i have * after Welcome means at 8th position. Let me know if anybody can help me on this.
This will work. (note: with quotes it's at 8 else at 7)
$("#tf").on('keyup', function(){
console.log($(this).val().indexOf('*'));
});
http://jsfiddle.net/Vandeplas/hc6ZH/
UPDATE: solution with multiple *
$("#tf").on('keyup', function(){
var pos = [],
lastOc = 0,
p = $(this).val().indexOf('*',lastOc);
while( p !== -1){
pos.push(p);
lastOc = p +1;
p = $(this).val().indexOf('*',lastOc);
}
console.log(pos);
});
http://jsfiddle.net/Vandeplas/hc6ZH/1/
UPDATE: giving only the position of the * char you just typed
(function ($, undefined) {
$.fn.getCursorPosition = function() {
var el = $(this).get(0);
var pos = 0;
if('selectionStart' in el) {
pos = el.selectionStart;
} else if('selection' in document) {
el.focus();
var Sel = document.selection.createRange();
var SelLength = document.selection.createRange().text.length;
Sel.moveStart('character', -el.value.length);
pos = Sel.text.length - SelLength;
}
return pos;
}
})(jQuery);
$("#tf").on('keypress', function(e){
var key = String.fromCharCode(e.which);
if(key === '*') {
var position = $(this).getCursorPosition();
console.log(position);
} else {
return false;
}
});
http://jsfiddle.net/Vandeplas/esDTj/1/
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