JS原生数据双向绑定实现代码
程序员文章站
2022-05-14 19:32:34
代码如下：
&l...
代码如下：
<span style="font-family:times new roman;font-size:14px;" deep="7"><!doctype html>
<html lang="en"> <head>
<meta charset="utf-8">
<title>demo</title>
<script>
function databinder( object_id ) {
// create a simple pubsub object
var pubsub = {
callbacks: {},
on: function( msg, callback ) {
this.callbacks[ msg ] = this.callbacks[ msg ] || [];
this.callbacks[ msg ].push( callback );
},
publish: function( msg ) {
this.callbacks[ msg ] = this.callbacks[ msg ] || [];
for ( var i = 0, len = this.callbacks[ msg ].length; i < len; i++ ) {
this.callbacks[ msg ][ i ].apply( this, arguments );
}
}
},
data_attr = "bind-" + object_id,
message = object_id + ":input",
timein;
changehandler = function( evt ) {
var target = evt.target || evt.srcelement, // ie8 compatibility
prop_name = target.getattribute( data_attr );
if ( prop_name && prop_name !== "" ) {
cleartimeout(timein);
timein = settimeout(function(){
pubsub.publish( message, prop_name, target.value );
},50);
}
};
// listen to change events and proxy to pubsub
if ( document.addeventlistener ) {
document.addeventlistener( "input", changehandler, false );
} else {
// ie8 uses attachevent instead of addeventlistener
document.attachevent( "oninput", changehandler );
}
// pubsub propagates changes to all bound elements
pubsub.on( message, function( evt, prop_name, new_val ) {
var elements = document.queryselectorall("[" + data_attr + "=" + prop_name + "]"),
tag_name;
for ( var i = 0, len = elements.length; i < len; i++ ) {
tag_name = elements[ i ].tagname.tolowercase();
if ( tag_name === "input" || tag_name === "textarea" || tag_name === "select" ) {
elements[ i ].value = new_val;
} else {
elements[ i ].innerhtml = new_val;
}
}
});
return pubsub;
}
function dbind( uid ) {
var binder = new databinder( uid ),
user = {
// ...
attributes: {},
set: function( attr_name, val ) {
this.attributes[ attr_name ] = val;
// use the `publish` method
binder.publish( uid + ":input", attr_name, val, this );
},
get: function( attr_name ) {
return this.attributes[ attr_name ];
},
_binder: binder
};
// subscribe to the pubsub
binder.on( uid + ":input", function( evt, attr_name, new_val, initiator ) {
if ( initiator !== user ) {
user.set( attr_name, new_val );
}
});
return user;
}
</script>
</head>
<body>
<input type="text" bind-1="name" />
<span bind-1="name"></span>
<script>
var dbind = new dbind( 1 );
dbind.set( "name", "" );
</script>
</body>
</html>
</span>
效果示例：
总结
以上所述是小编给大家介绍的js原生数据双向绑定实现代码，希望对大家有所帮助