jQuery Validate plugin, one out of two fields is required

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Using the optional additional-methods.js file, there is a method called require_from_group that does exactly what you request. (You must use at least version 1.11.1 of the plugin in order to avoid a past bug.)

rules: {
    mobile:{
        require_from_group: [1, '.mygroup']
    },
    telephone:{
        require_from_group: [1, '.mygroup']
    }
},
....

The 1 parameter is how many from the group are required. In the HTML markup, the fields in your group must contain a class matching the class specified in your second parameter.

<input type="text" class="mygroup" name="mobile" />
<input type="text" class="mygroup" name="telephone" />

Working DEMO: http://jsfiddle.net/NfcxX/

My demo also shows the groups option which combines the multiple error messages into one.

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