Extensions that start with the letter O, run on ExpressionEngine 1, are compatible with Multi-Site Manager, are Free and are sorted by Edit Date.

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ExpressionEngine 1.x, ExpressionEngine 2

The onSubmit extension lets you add an onsubmit Javascript handler to any EE form. This lets you validate forms through Javascript prior to submission thus improving site usability and reducing server load.

Updated February 14, 2014, 6:02 pm.

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