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Want to find records with no associated records in Rails
... get everyone with no friends in the first case:
Person.where('id NOT IN (SELECT DISTINCT(person_id) FROM friends)')
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Change Placeholder Text using jQuery
... Note for OP: Also note that the change event is hooked to the select box, not the text input. $('#serMemdd').change(function () {
– Benjam
Feb 10 '12 at 18:51
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Explain ExtJS 4 event handling
...js4.1)
Lets say we have a controller Station (Sencha MVC examples) with a select box:
Ext.define('Pandora.controller.Station', {
extend: 'Ext.app.Controller',
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init: function() {
this.control({
'stationslist': {
selectionchange: this.onStationSel...
Get selected value of a dropdown's item using jQuery
How can I get the selected value of a dropdown box using jQuery?
I tried using
30 Answers
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Set selected option of select box
I want to set a option that was selected previously to be displayed on page load. I tried it with the following code:
16 An...
What does it mean that Javascript is a prototype based language?
...asked... continually up the chain until the property is found or until the root object is reached.
Each function in JavaScript (which are objects themselves) actually has a member called "prototype", which is responsible for providing values when an object is asked for them. Having this member allo...
jQuery Validate Required Select
I am trying to validate html select element using jQuery Validate plugin. I set "required" rule to true but it always passes validation because zero index is chosed by default. Is there any way to define empty value that is used by required rule?
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How to pull specific directory with git
...file
Where "path/..." in (3) starts at the directory just below the repo root containing your ".../file"
NOTE that instead of "HEAD", the hash code of a specific commit may be used, and then you will get the revision (file) or revisions (dir) specific to that commit.
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Why are primes important in cryptography?
... You actually only have to test the prime numbers up to the square root of the number you are trying to factor.
– Matthew Brubaker
Jan 13 '09 at 19:27
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On select change, get data attribute value
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You need to find the selected option:
$(this).find(':selected').data('id')
or
$(this).find(':selected').attr('data-id')
although the first method is preferred.
shar...