Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>Probably some different approaches that you could take here. Here is one thought (feel free to use a better name than <code>optionsPlus</code>):</p> <pre><code>ko.bindingHandlers.optionsPlus = { preprocess: function(value, name, addBindingCallback) { //add optionsCaption to the bindings against a "caption" sub-observable addBindingCallback("optionsCaption", value + ".caption"); //just return the original value to allow this binding to remain as-is return value; }, init: function(element, valueAccessor) { var options = valueAccessor(); //create an observable to track the caption if (options &amp;&amp; !ko.isObservable(options.caption)) { options.caption = ko.observable(); } //call the real options binding, return to control descendant bindings return ko.bindingHandlers.options.init.apply(this, arguments); }, update: function(element, valueAccessor, allBindings) { var options = valueAccessor(), value = ko.unwrap(options); //set the caption observable based on the length of data options.caption(value.length === 1 ? null : allBindings.get("defaultCaption")); //call the original options update ko.bindingHandlers.options.update.apply(this, arguments); } }; </code></pre> <p>You would use it like:</p> <pre><code>&lt;select data-bind="optionsPlus: choices, defaultCaption: 'choose one...'"&gt;&lt;/select&gt; </code></pre> <p>It creates a <code>caption</code> observable off of your observableArray/array and updates the caption initially and whenever the options are updated (if using an observableArray).</p> <p>Sample here: <a href="http://jsfiddle.net/rniemeyer/jZ2FC/">http://jsfiddle.net/rniemeyer/jZ2FC/</a></p>
    singulars
    1. This table or related slice is empty.
    1. POKnockout: how to update another binding from custom binding?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USRP Niemeyer
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POKnockout: how to update another binding from custom binding?
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    1. COhave tried the same technique for enable, visible and all other top level bindings (for example to disable drop down when only one option available). as far as I could see addBindingCallback doesn't wire top level binding with sub-observable of another. init of options is called after enable update its state. any ideas?
      singulars
      1. PO
      1. USYauhen.F
    2. COcan you put something in jsFiddle? not sure I understand.
      singulars
      1. PO
      1. USRP Niemeyer
    3. COsomething like this one: http://jsfiddle.net/Y2SUn/ I see some "after" property inside bindinghandlers but not sure it is documented. Generally it could be even custom binding (if it is not possible to patch original binding) that "and" original enable value and some options value calculated boolean.
      singulars
      1. PO
      1. USYauhen.F
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload