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What's the difference between $(this) and this in jQuery, and why do they sometimes give the same result and other times behave differently? $(this) wraps this with the jQuery functionality. For example, this code would fail: $('.someDiv').onClick(function(){ // this refers to the DOM element so the following line would fail this.fadeOut(100); }); So we wrap this in jQuery: $('.someDiv').onClick(function(){ // wrap this in jQuery so we can use jQuery fadeOut $(this).fadeOut(100); }); $(this) decorates whatever object this points to with the jQuery functions. The typical use case is for this to

Possible Duplicate: jQuery $(this) vs this In jquery sometimes I find that within a function I have to use $(this) because this won't work: var listItems = $('li'); listItems.each(function(index) { $(this).css({ }) }) Any ideas as to the reason why? jAndy $() is the jQuery constructor function this is a reference to the DOM element of invocation So basically, you're turning a DOM reference into a jQuery object In your example, you could also use listItems.each(function(index, element){ $(element).css({ }); }); ..since .each() will pass both, index + element in its callback. this is the native

As per local testing, 'this' seems to be null inside the row render function. As a result this prevents me from binding a local function on the onPress prop. I have this render block: render() { return ( <ListView dataSource={this.state.dataSource} renderRow={this._renderRow} renderHeader={this._renderHeader} style={styles.listView} /> ); } and a local function _visitEntryDetail() { console.log('test'); } then row render _renderRow(something) { return ( <TouchableHighlight style={[styles.textContainer, filestyle.container]} onPress={this._visitEntryDetail.bind(this)} > <View> <Text style=

Within a member function of a class in C++, does it make a difference, if I use this->dataMember or just dataMember ? What is considered better style? Is there any performance difference? (I am not talking about the case where a local variable has the same name as the data member, in which case you must, to my knowledge, use this-> to distinguish between them.) As a general rule, it's a question of local conventions. Most of the places I've seen do not use this-> except when necessary, and that's the convention I prefer as well, but I've heard of people who prefer to use it systematically.