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What is the difference between the states selected, checked and activated in Android?

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问题 I'd like to know what differs those states. I didn't find any webpage clarifying this. 回答1: The difference between Checked and Activated is actually quite interesting. Even the Google documentation is apologetic (emphasis below added): ... For example, in a list view with single or multiple selection enabled, the views in the current selection set are activated. (Um, yeah, we are deeply sorry about the terminology here.) The activated state is propagated down to children of the view it is set

how do I get all checkbox variables even if not checked from HTML to PHP?

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问题 I noticed that PHP seems to return only values of checked checkboxes. I would like to see a list of checkboxes, not just values of checked checkboxes. Is there a way to detect variables of unchecked boxes? I asked because I want to be able to update settings. For example, I have a few options that are already checked but if an user decides to uncheck an option, I need to know that unchecked value so I can update the option to be disabled. 回答1: I just ran into this problem myself. I solved it

jquery attr('checked','checked') works only once

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I have a problem finding reason for the following jquery/checkbox behaviour. $( this.obj + ' table.sgrid-content > thead > tr > th > input.select_all' ).on( 'click' , {grid:this} , function(event){ var grid = event.data.grid; if( $(this).is(':checked') ){ $( grid.obj + ' table.sgrid-content > tbody > tr > td > input.select ' ).attr('checked','checked'); $( grid.obj + ' .sgrid-content > tbody > tr > td > input.select ' ).parents('tr').addClass('ui-state-highlight'); } else { $( grid.obj + ' table.sgrid-content > tbody > tr > td > input.select ' ).removeAttr('checked'); $( grid.obj + ' table

Why doesn't C# use arithmetic overflow checking by default? [duplicate]

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问题 Possible Duplicate: Why don’t languages raise errors on integer overflow by default? Why doesn\'t C# use arithmetic overflow checking by default? I figure that it would generally be better to have exceptions occur when this occurs so that errors aren\'t obscured. I know that it\'s occasionally useful to take advantage of the \'wrapping\' behaviour that occurs, but the unchecked keyword could be used in these circumstances to make the intentions explicit. I expect that this decision was made

jquery attr('checked','checked') works only once

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问题 I have a problem finding reason for the following jquery/checkbox behaviour. $( this.obj + \' table.sgrid-content > thead > tr > th > input.select_all\' ).on( \'click\' , {grid:this} , function(event){ var grid = event.data.grid; if( $(this).is(\':checked\') ){ $( grid.obj + \' table.sgrid-content > tbody > tr > td > input.select \' ).attr(\'checked\',\'checked\'); $( grid.obj + \' .sgrid-content > tbody > tr > td > input.select \' ).parents(\'tr\').addClass(\'ui-state-highlight\'); } else {

Find out if radio button is checked with JQuery?

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I can set a radio button to checked fine, but what I want to do is setup a sort of 'listener' that activates when a certain radio button is checked. Take, for example the following code: $("#element").click(function() { $('#radio_button').attr("checked", "checked"); }); it adds a checked attribute and all is well, but how would I go about adding an alert. For example, that pops up when the radio button is checked without the help of the click function? $('#element').click(function() { if($('#radio_button').is(':checked')) { alert("it's checked"); } }); Parag If you have a group of radio

Find out whether radio button is checked with JQuery?

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问题 I can set a radio button to checked fine, but what I want to do is setup a sort of \'listener\' that activates when a certain radio button is checked. Take, for example the following code: $(\"#element\").click(function() { $(\'#radio_button\').attr(\"checked\", \"checked\"); }); it adds a checked attribute and all is well, but how would I go about adding an alert. For example, that pops up when the radio button is checked without the help of the click function? 回答1: $('#element').click

Setting “checked” for a checkbox with jQuery?

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问题 I\'d like to do something like this to tick a checkbox using jQuery : $(\".myCheckBox\").checked(true); or $(\".myCheckBox\").selected(true); Does such a thing exist? 回答1: Modern jQuery Use .prop(): $('.myCheckbox').prop('checked', true); $('.myCheckbox').prop('checked', false); DOM API If you're working with just one element, you can always just access the underlying HTMLInputElement and modify its .checked property: $('.myCheckbox')[0].checked = true; $('.myCheckbox')[0].checked = false;