I believe it uses something like the index of the item as the default when you do not provide a key. This can be validated by using {#each things as thing, index (index)} <Thing current={thing.color}/> {/each} which gives the same behavior as not using a key in the first place. Let’s call the <Thing> that … Read more
Add a flag that has to be false to continue. function validate() { var invalid = false; $(‘.var_txt’).each(function() { if ($.trim($(this).val()) == ”) { $(this).focus(); invalid = true; return false; } }); if (invalid) { return false; } if (!$(“.answer:checked”).val()) { alert(“boom”); return false; } return true; } $(document).ready(function() { $(“#add_question”).submit(function(e) { if (validate()) { … Read more
Ruby reads your mind. You want cons ecutive elements? [1, 2, 3, 4, 5, 6, 7, 8, 9].each_cons(2).to_a # => [[1, 2], [2, 3], [3, 4], [4, 5], [5, 6], [6, 7], [7, 8], [8, 9]]
This article (#3) ran some performance tests and found that the jQuery .each function was about 10x as slow as the native javascript for loop. From 10 Ways to Instantly Increase Your jQuery Performance – 3. Use For Instead of Each Using Firebug, it’s possible to measure the time each of the two functions takes … Read more
Since you have an object, not a jQuery wrapper, you need to use a different variant of $.each() $.each(json, function (key, data) { console.log(key) $.each(data, function (index, data) { console.log(‘index’, data) }) }) Demo: Fiddle
Actually, it’s as simple as running the .each inside setTimout. setTimeout(function(){ $(“.inputs”).each(function(){$(this).val(“new-value”)}); }, 5000);
Your test is too heavy to really determine the actual difference between the three looping options. If you want to test looping, then you need to do your best to remove as much non-related work from the test as possible. As it stands, your test includes: DOM selection DOM traversal element mutation All of those … Read more
1) Paste: var script = document.createElement(‘script’); script.src = “https://ajax.googleapis.com/ajax/libs/jquery/1.6.3/jquery.min.js”; document.getElementsByTagName(‘head’)[0].appendChild(script); on your console (includes jQuery) 2) Wait 1 sec and paste: var h2Arr = []; $(‘h2’).each( function() { h2Arr.push($(this).html()); }); Now, all contents of h2 tags of that page should be stored into h2Arr
In Lodash, on the other hand, returning false tells _.forEach() that this iteration will be the last. Is there a way to make the “continue” behavior also functional in Lodash? You could return true, or just a single return (which returns undefined), this value is different from needed false for “exit iteration early by explicitly … Read more
You are jumping out, but from the inner loop, I would instead use a selector for your specific “no value” check, like this: function validate(){ if($(‘input[type=text][value=””]’).length) return false; } Or, set the result as you go inside the loop, and return that result from the outer loop: function validate() { var valid = true; $(‘input[type=text]’).each(function(){ … Read more