javascript-events

问题 I have 2 dropdown menus that read their data from a MySQL database. I use php for connecting to database. The second dropdowns should get populated based on the selection on the first dropdown. The process seems as below to me (correct me if I'm wrong): php section connects to MySQL database and populates dropdown1. user selects a value on dropdown1 and onchange event is called. within the onchange function (which is javascript), a query is sent to MySQL database to fetch values of dropdown2

问题 Ctrl+W and Alt+F4 command close the IE browser. I want to disable this default action. I can handle with Ctrl+W command. But I can't with Alt+F4 event. I found that Alt+Keys event(eg; Alt+Enter, Alt+Right Arrow, Alt+Left Arrow) can't to disable their default action. Is it possible to disable Alt+Key event in IE browser? 回答1: You absolutely cannot do this with Javascript, for obvious security reasons. If you are making a kiosk application that uses shdocvw.dll to render pages, then you have

问题 Ctrl+W and Alt+F4 command close the IE browser. I want to disable this default action. I can handle with Ctrl+W command. But I can't with Alt+F4 event. I found that Alt+Keys event(eg; Alt+Enter, Alt+Right Arrow, Alt+Left Arrow) can't to disable their default action. Is it possible to disable Alt+Key event in IE browser? 回答1: You absolutely cannot do this with Javascript, for obvious security reasons. If you are making a kiosk application that uses shdocvw.dll to render pages, then you have

问题 Ctrl+W and Alt+F4 command close the IE browser. I want to disable this default action. I can handle with Ctrl+W command. But I can't with Alt+F4 event. I found that Alt+Keys event(eg; Alt+Enter, Alt+Right Arrow, Alt+Left Arrow) can't to disable their default action. Is it possible to disable Alt+Key event in IE browser? 回答1: You absolutely cannot do this with Javascript, for obvious security reasons. If you are making a kiosk application that uses shdocvw.dll to render pages, then you have

问题 Is is possible to get the ABSOLUTE path to a file using javascript or jquery? These are my trials so far but the closest I can get is just the filename. var filepath = $('input[type=file]').val(); var test = this.files; var test2 = test[0]; var test3 = test2.fileName; var test4 = test2.filePath; var test5 = test2.Name; var h = imageInput.value; var b = document.getElementById("AcademicPhotoId"); var l = b.value; var binary = b.getAsBinary(); $('.image-display img').attr('src', filepath); 回答1:

问题 I have js functionality where a html tag is generated in js and a click function is associated with it. Right now i am trying to attach my js functionality to my generated html, but I don't know how to implement it. I have provided my code below. When i click the select button the animation effect should take place, but I don't know how to associate the function UversePlanSelector.prototype.click with the select button. Not working code Working code <div class="plan"> <div class="plan_head">

问题 According to the jQuery API The change event is sent to an element when its value changes. This event is limited to <input> elements, <textarea> boxes and <select> elements. For select boxes, checkboxes, and radio buttons, the event is fired immediately when the user makes a selection with the mouse, but for the other element types the event is deferred until the element loses focus. Is there a way to make the text fields and text areas fire an event when the input text is changed and not

问题 I have a script where I can add text fields with "Add Button" but the rest of fields get default value of first field. You can check the demo here. Just type Apple in item field in demo and you will get the price 69 for that. Then when you click "Add Item" button, it gives you default value of 69 for all generated price fields. I want to show the empty price field for new items. My Script : Add Dynamic Row function addRow(tableID) { var table = document.getElementById(tableID); var rowCount =

问题 I have a script where I can add text fields with "Add Button" but the rest of fields get default value of first field. You can check the demo here. Just type Apple in item field in demo and you will get the price 69 for that. Then when you click "Add Item" button, it gives you default value of 69 for all generated price fields. I want to show the empty price field for new items. My Script : Add Dynamic Row function addRow(tableID) { var table = document.getElementById(tableID); var rowCount =

问题 Why in the following code the focusin event handler isn't called ? HTML: <div id='wrapper'></div> <div id='button'>Click Here</div> <div id='output'></div> JS: $(function() { $('input').live('focusin', function() { $('#output').html('focusin'); // Why this not happens ? }); $('#button').click(function() { $('#button').hide(); build_inputs(); }); }); function build_inputs() { var html = "<input type='text' /> \ <br /> \ <input type='text' />"; $('#wrapper').append(html); $('#wrapper').fadeIn