extjs listeners用法

银月城主2022-10-04 11:39:541条回答

extjs listeners用法
例如有这么一段代码,其中的listeners在这里是什么意思,如何使用
items:[
app.loginForm=new Ext.form.FormPanel({
labelAlign:'left',
buttonAlign:'center',
bodyStyle:'padding:5px',
frame:true,
labelWidth:80,
items:[
{
xtype:'textfield',
name:'txt1',
fieldLabel:'用户名称',
allowBlank :false,
anchor:'90%',
enableKeyEvents:true,
listeners:{
keypress:function(field,e){
if(e.getKey()==13){
var obj=app.loginForm.form.findField("txt2");
if(obj) {
obj.focus();
}
}
}
}},

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水之小溪 共回答了20个问题 | 采纳率85%
就是当你键盘按下去的时候 执行这段代码
keypress事件:输入字段键盘按下时的事件.该事件只会在enableKeyEvents为true时有效.
e.getKey()==13 就是当你按下 回车的时候
后面执行的就是你选中其中一个组件,并聚焦这个组件(选中组件的text).
1年前

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e seated,被动式表示一种状态,做好了.
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B

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英语选择题

When the speaker entered the hall,all the listeners_____.

A.had seated B.were seated C.seated D.were seating

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C.took good care of D.have been taken good care of

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A.took care of B.take care of C.take caren D. took care

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答案是BDBDB,要详细的原因

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B D taken care of won't shut B
be seated =be sitting entered过去时,所以这个也得用过去时were seated
since ...用现在完成时 此句子还得用被动形式,因为孩子们被照顾地很好,所以用have been taken good care of take good care of 是短语,照顾地很好
The patient is well taken care of.病人被照顾地很好.也得用被动 take care of 是短语 照顾
the door won't shut.门就是关不上.(与人的意愿相反)
类似句子:
The machine just won't start.(与人的意愿相反)
open,close,shut,lock,move等一类动词,它们既可以用作及物动词,也可以用作不及物动词;当它们用作不及物动词且表示主语的某种属性时,通常用主动形式表示被动意义,此时通常与can’t,won’t 等连用.用的是主动形式表示被动意义,它强调的是主语的属性,即门本身有问题,没法关上.
photos taken in...在.地方拍的照片 照片被拍,所以得用被动.过去分词taken修饰photos
after they come out 一般现在时表示将来
类似:I'll give you a hug when you come out.
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表示监听,写一个例子你就知道了:
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B
意思是 因为许多活动环节的推出,越来越多的人将会加入到电话会谈节目中来
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46.A
依据:It's our own hospital radio wishing you a quick recovery (康复).
这个you当然是指Patients 病人.
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依据:The hospital can sleep 800 patients.There are 8 beds in each ward (病房) .
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依据:The visiting hours are in the afternoon from 2:30 to 3 :30 and in the evening from 7 :00 to 8 :00.
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依据:Before our music programme at four,I'm going to repeat (重复) some of our hospital rules.
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比如在这句话中,Good listeners or door openers typically have the following elements.怎么理解door opener?
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开门者,开门的人.
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1. Who do you think the listeners might be?
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1-3CBA
( ) of the boring speech ,the listeners began to sleep A.tir
( ) of the boring speech ,the listeners began to sleep A.tired of B.Tired fromC.tring ofDtring from
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A 应该是Tired of
主语是the listeners ,形容人应该使用过去分词.
tired of厌倦, 厌烦,例如:
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我厌倦了他不断的抱怨.
单句改错∶When he came in,the speaker found the listeners seating
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seating---->had been seated
进来时,演讲者发现听众已经坐好了.
be seated是做好的意思,而“听众坐好”是在过去某时已完成,故用过去完成时.
when the speaker entered the hall,all the listeners__.这个空为什么
when the speaker entered the hall,all the listeners__.这个空为什么填were seated.为什么老师说如果原句去掉when就填steaed
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句首的单词when表示当…的时候,接下来的句子肯定要是进行时态,were seated表示听众正在坐着是过去进行时态,如果没有when的话就是一般过去时态,用seat的过去式seated,望采纳,谢谢