Select value on load and change

I have a select that appears on certain value (500) I need to be able to let it load on 500 and after it loads just change it to 50. I already managed to do this doing:

$select = $('select[name="content-table-redesign_length"]');
    $select.val('50');

however, even th开发者_运维技巧ough the select value changes it doesn't reload the table as it would normally if the user were the one to change the value of the select. How can I make it emulate that change. Basically, how can I get it to do automatically what it does normally when a user changes the value.

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$select.val('50').change();

This will trigger the change javascript.

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then applies the change to the select element :

$(select).change();

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you can use jQuery trigger to trigger the onChange event

$select.trigger('change');