attr | 易学教程

How does one add an attribute to a model?

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问题 In rails I generate a model with two strings and would like to add more. How would I go about doing this? 回答1: Active Record maps your tables columns to attributes in your model, so you don't need to tell rails that you need more, what you have to do is create more columns and rails is going to detect them, the attributes will be added automatically. You can add more columns to your table through migrations: rails generate migration AddNewColumnToMyTable column_name:column_type(string by

Jquery - animate height toggle

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问题 I have a 10px bar along the top of the screen that, when clicked, I want it to animate to a height of 40px and then if clicked again, animate back down to 10px. I tried changing the id of the div, but it isn't working. How could I get this to work, or is there a better way to do it? body html: <div id="topbar-show"></div> css: #topbar-show { width: 100%; height: 10px; background-color: #000; } #topbar-hide { width: 100%; height: 40px; background-color: #000; } javascript: $(document).ready

jQuery - How to select value by attribute name starts with

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I want to select attribute value by giving attribute name (only starts with) For instance if we have html tag <div class = "slide" data-confirmID = "46" confirmID = "54"/> I want to select the value from the attribute starts with data- Thanks in advance for the help. If you want all data-* attributes, you can iterate through jq data object: $('.slide').each(function(){ for(data in $(this).data()) console.log(data); // returns confirmID so element as an attribute `data-confirmID` }); But this data object can contains other keys which aren't attribute, setted for example by some plugins. EDIT To

How to replace element's attr href with each ? // strip url

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问题 im trying to change href with each method, here is demo, inspect a, you'll see there is no change html: <a href="#/news">News</a> <a href="#/news/detail">Detail</a> <a href="#/sport">Sport</a> <a href="#/sport/football">Football</a> jQuery: $('a').each(function() { $(this).attr('href').replace('#/',''); //tried to erase #/ from all hrefs }); 回答1: The code you posted will get the value as a string then properly replace the values but it immediately discards the result. You need to

jQuery .attr(“disabled”, “disabled”) not working in Chrome

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Not sure why this isn't working. When people click the 'edit' button of my application, the disabled textfields become editable: $("#bewerken").click(function(e) { $("input[disabled='disabled']").removeAttr('disabled'); }); I then want to disable the textfields again when the user saves; I have this code bound to my save button: $("#save_school_changes").click(function(e) { //stuff $.ajax({ type: "POST", url: "/school/save_changes", data: { //stuff }, success: function(data) { $("#feedback_top").html("<p>" + data['message'] + "</p>").slideDown('slow').delay(2000).slideUp(); $("input[type='text

Why jQuery 1.9+ attr() method not deprecated?

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问题 Can I, a jQuery1.9+ software developer, "deprecate" the use of the attr() method in my day-by-day work? As showed in many questions, .prop() vs .attr() (main) jQuery attr vs. prop, there are a list of props? jQuery attr vs prop? Migrating jQuery 1.8.3 to 1.9.0 - Replacing deprecated .attr() ... etc. ... there are a lot of confusion about "use attr or use prop?" , and, by my (developer's) view point, for all uses of attr() method, we can use prop instead: backward-compatibility : coding new

Error:(9, 5) error: resource android:attr/dialogCornerRadius not found

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问题 So I installed android studio 3.0.1 and as soon as it opened the gradle built and showed the following errors. I tried adding dependencies such as design and support but in vain. Could someone help me? Thank you in advance. It shows that some attributes such as dialogCornerRadius and fontVariation Settings not found. 回答1: This error occurs because of mismatched compileSdkVersion and library version. for example: compileSdkVersion 27 implementation 'com.android.support:appcompat-v7:26.1.0'

Toggle input disabled attribute using jQuery

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Here is my code: $("#product1 :checkbox").click(function(){ $(this) .closest('tr') // Find the parent row. .find(":input[type='text']") // Find text elements in that row. .attr('disabled',false).toggleClass('disabled') // Enable them. .end() // Go back to the row. .siblings() // Get its siblings .find(":input[type='text']") // Find text elements in those rows. .attr('disabled',true).removeClass('disabled'); // Disable them. }); How do I toggle .attr('disabled',false); ? I can't seem to find it on Google. $('#el').prop('disabled', function(i, v) { return !v; }); The .prop() method accepts two

Setting new value for an attribute using jQuery

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问题 I am trying to set a new vale of a custom attribute of a div using attr(). I found out it can be done using .attr( attributeName, value ) , but when I try it it's not working. Here is the part of my code I am interested in: $('#amount').attr( 'datamin','1000') and the div that has the custom attribute is <div id="amount" datamin=""></div> Here is the whole example: $(function() { $( "#slider-range" ).slider({ range: true, min: <?php echo $min_val;?>, max: <?php echo $max_val;?>, values: [ <

jQuery attr vs prop?

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Now this isn't just another What's the difference question , I have done some tests(http://jsfiddle.net/ZC3Lf/) modifying the prop and attr of <form action="/test/"></form> with the output being: 1) prop Modification test Prop: http://fiddle.jshell.net/test/1 Attr: http://fiddle.jshell.net/test/1 2) Attr Modification test Prop: http://fiddle.jshell.net/test/1 Attr: /test/1 3) Attr then Prop Modification test Prop: http://fiddle.jshell.net/test/11 Attr: http://fiddle.jshell.net/test/11 4) Prop then Attr Modification test Prop: http://fiddle.jshell.net/test/11 Attr: http://fiddle.jshell.net