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jquery lets textarea support ctrl+z "undo" functionality

Source: Internet
Author: User
Tags setinterval
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The core code is just this little bit.

The code is as follows Copy Code
var log = [];
$ (function () {
var txt = window.setinterval (function () {
if (Log[log.length-1]!= $ ("#t"). Val ()) {
Log[log.length] = $ ("#t"). Val ();
}
}, 1500);
var Isctrl = false;
$ (document). KeyDown (function (e) {
if (E.which = = 17)
Isctrl = true;
if (E.which = = && Isctrl = = True) {
Log.pop ();
$ ("#t"). Val (Log[log.length-1]). blur ();
}
}). KeyUp (function (e) {
if (E.which = = 17)
Isctrl = false;
});
});

Complete instance

The code is as follows Copy Code

<! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">
<title></title>
<script src= "Http://z3f.me/js/jquery-1.6.2.min.js" type= "Text/javascript" ></script>
<script type= "Text/javascript" >
var log = [];
$ (function () {
var txt = window.setinterval (function () {
if (Log[log.length-1]!= $ ("#t"). Val ()) {
Log[log.length] = $ ("#t"). Val ();
}
}, 1500);
var Isctrl = false;
$ (document). KeyDown (function (e) {
if (E.which = = 17)
Isctrl = true;
if (E.which = = && Isctrl = = True) {
Log.pop ();
$ ("#t"). Val (Log[log.length-1]). blur ();
$ ("#s"). Val (Log[log.length-1]). blur ();
}
}). KeyUp (function (e) {
if (E.which = = 17)
Isctrl = false;
});
});
Function Show () {
$ ("#s"). Val ("");
for (var i = 0; i < log.length; i++) {
$ ("#s"). Val (log[i]+ "rn[" + i + "]rn-----------------------rn" +$ ("#s"). Val ());
}
}
</script>

<body>

<textarea id= "T" style= "width:400px; height:300px; " >
</textarea>

<button onclick= "Show ()" > Display history </button>
<textarea id= "s" style= "width:400px; height:300px; " >
</textarea>
Press Ctrl+z to undo one step at a
Exchange please add QQ 10590916
</body>

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Related Keywords:
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