How to implement specified assignment method using js and jQuery

Now I will share with you an article about js, jQuery and easyui to implement the designated value assignment method for the drop-down box. It has a good reference value and I hope it will be helpful to everyone.

js implementation:

#1. Select the i-th option by letting it be selected. The code is as follows: ( id is the drop-down box id)

(1) document.getElementById("id").options[i].selected=true;

(2) document.getElementById(" messagetoid").selectedIndex = 1; (Select the first option)

2. This is achieved by judging the value of the option. The code is as follows:

document.getElementById ("messagetoid").value=""; (Select the option whose value is empty)

jQuery implementation:

1. By selecting the i-th option, similar to 1 implemented in js, the code is as follows:

$("#id").get(0).selectedIndex =

1; (Select the first option)

2. By judging the value of the option, there are two methods. The code is as follows:

(1)$(" #id").val("123"); (Select the option with value "123")

(2)$("#messagetoid").attr("value", ""); (Select the option whose value is empty)

EasyUI implementation:

$('#id').combobox('setValue', 'A'); (Select the option whose value is A,)

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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