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POChaining Knockout Custom Bindings
 

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    <p>I have a Knockout custom binding handler that I want to call the foreach bindings functionality on within it and then call a callback function afterwards. I keep getting a "Uncaught Error: You cannot apply bindings multiple times to the same element. " error now as I try to do this.</p> <p>My custom binding is pretty simple (typescript):</p> <pre><code>/// &lt;reference path="knockout.d.ts" /&gt; ko.bindingHandlers["postForeach"] = { init: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) { if (!allBindingsAccessor().postForeachCallback) throw "Callback not defined for postForeach binding!"; //call foreach init functionality ko.bindingHandlers['foreach'].init(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext); }, update: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) { //call foreach update functionality ko.bindingHandlers['foreach'].update(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext); //call callback allBindingsAccessor().postForeachCallback(); } }; </code></pre> <p>Is there something I am missing in constructing this?</p> <p>Thanks!</p> <p>EDIT:</p> <p>Callback Function</p> <pre><code>self.populateMainContentWindow = function () { var dataTable = $(this.tableId).dataTable(); dataTable.fnDestroy(); // create the datatable var actualTable = this.jQuery(this.tableId); if (actualTable.length == 0) { return false; } // create the data table with options var newDataTable = actualTable.dataTable(this.options); // always set the width afterwards actualTable.css("width", "100%"); }; </code></pre> <p>Data Bind Signature (which is within a 'with' binding):</p> <pre><code>postForeach: array, postForeachCallback: $parent.viewModel().populateMainContentWindow </code></pre>
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    1. COI haven't used TypeScript, which you appear to be using, but it looks like your binding is calling it's own init again. Have you tried putting a console.log in there to see if it is calling it's own init?
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    2. COPlease create a JSFiddle which repros your issue! Your code with Michael answer works fine: http://jsfiddle.net/94epu/
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    3. COWhat is `this` in `populateMainContentWindow`? Based on the code, it would be the binding object returned from `allBindingsAccessor`, which won't have `tableId`, `jQuery`, or `options`. So that function shouldn't be working.
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      1. USMichael Best
 

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