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Editorial Team
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Asked: 2026-06-13T10:50:25+00:00

This knockout 2.1 binding expression works fine under Firefox and IE9, but crashes in

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This knockout 2.1 binding expression works fine under Firefox and IE9, but crashes in IE9 compatibility mode with error “Expected identifier, string or number”:

<div data-bind="template: {
    if: myDataModel, 
    data: myDataModel, 
    afterRender: setup(myDataModel) }">

I found actual place under debugger, it’s this line of code (knockout-2.1.0.debug.js):

return new Function("sc", functionBody)

functionBody is a string equal to the expression above. I tried to play with spaces and carriage return characters – nothing helps, same results: it works as expected with any browser other than IE9 compatibility mode

Any suggestions?

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1 Answer

  1. Editorial Team

    I think the issue is that older versions of IE don’t like “if” or similar reserved words to appear as property names. Try putting single quotes around the property names.

    <div data-bind="template: {
'if': myDataModel, 
data: myDataModel, 
afterRender: setup(myDataModel) }">

    Another common time that you’ll have this happen when you have a “class” binding. Same fix:

    <tr data-bind="attr: { 'class': packageSelected() ? 'success' : '' }">

    List of reserved words in JS: https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Reserved_Words

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