jquery Select-related operations

Cases:

<class= "selector"  ID= "selector"></  Select>

1. Set value to Pxx item selected

$ ("#selector"). Val ("Pxx");

2. Set text to Pxx to select

Set the selection according to text
$ ("#selector"). Find ("option[text= ' Pxx ')"). attr ("selected",true);

Based on value to set the selected
$ ("#selector"). Find ("option[value= ' Pxx ')"). attr ("selected",true);

Here is the use of a bracket, preceded by the attribute name in parentheses, without quotation marks. In many cases, the use of brackets can make logic very simple.

3. Gets the value of the currently selected item

Notice that you want to use the IE8

$ (". Selector"). Find ("option:selected"). Val ();

$ ("#selector"). Val ();

4. Gets the text of the currently selected item

Notice that you want to use the IE8

$ (". Selector"). Find ("option:selected"). Text ();

$ ("#selector"). Find ("option:selected"). Text ();

Using a colon here, mastering its usage and extrapolate will also make the code concise.

There are many times when a select cascade is used, that is, the value of the second select changes with the value selected in the first select. This is very simple in jquery.

Such as:

$ (". Selector1"). Change (function() {     ///  first empty the second       $ (". Selector2 "). empty ();      // in real-world applications, the option here is typically generated by looping multiple      var option = $ ("<option>"). Val (1). Text ("Pxx");      $ (". Selector2"). Append (option);});

jquery Select-related operations