jQuery validation trigger error message

问题

I have a kinda wierd problem. I want to trigger a jquery-valdation errormessage on an element even thou it's valid.

Scenario: I have a large form. One of the inputs is for PersonalId. It's optional to enter that PersonalId. Beside that input i have a normal button (not the submit-button). If you click on that (fetching information from ajax) and the PersonalId field is empty i want to trigger that Error-message.

Is that possible with jQuery Validate or do i need to create my own function?

回答1:

Is that possible with jQuery Validate or do i need to create my own function?

Both, sort of. You can use the showErrors function to display errors on the form manually, but since you don't want this to be a rule that is enabled when you submit the form, you'll have to do your own checking for the value in the input.

Something like:

var $validator = $("#myform").validate();
$("#checkid").click(function() {
    var errors;

    if (!$("#personalid").val()) {
        /* Build up errors object, name of input and error message: */
        errors = { personalid: "Please enter an ID to check" };
        /* Show errors on the form */
        $validator.showErrors(errors);            
    }        
});

Example: http://jsfiddle.net/andrewwhitaker/XjZer/

Note that the form will still submit if there is nothing in the personalid field.

来源：https://stackoverflow.com/questions/10350154/jquery-validation-trigger-error-message