This handler prevents the default event (submitting the form) from being fired, sets the value of the extra ajax argument to 1, and makes an ajax Request using the original form for the URL and data.

这个处理程序阻止默认事件(提交表单)触发，将额外的ajax参数的值设置为1，使用原始表单发出一个ajax请求以获取URL和数据。

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text_line sets the font, using the supplied height value as the scale value for the font.

text_line 将使用提供的高度值作为字体的刻度值来设置字体。

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The method then sets the parameter named "location" (marked by :location in the namedQuery) on the query, using the user-supplied value passed into this method.

然后方法设置名为“location”的参数（由 namedQuery 中的 :location 标示），它使用传递给方法的用户提供的值。

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