ExtJs 组合框:加载后不填充自定义值(forceSelection 为 false)
在 ExtJs4 中,我有一个带有组合框的表单,其中数据以 json 格式从数据库加载,
this.getForm().load({url: '/ext/get-patient', ...
用户可以输入除预定义值之外的自定义值,通过 forceSelection
属性进行配置设置为假。
我遇到的问题是:
当用户从组合框中的存储中选择任何预定义值、保存并再次重新加载条目时,一切正常。 但是当用户在组合框字段中输入自定义值(即“abcde”)时,保存(并且我可以看到输入的自定义值已正确存储在数据库中),然后再次加载表单数据(正确的自定义值位于 json 响应中),则在加载过程后组合框将不会填充此自定义值。
为什么 - 或者如何解决?
这是组合框使用的存储定义:
// The data store for the diagnoses combobox
var diagnosisStore = Ext.create('Ext.data.Store', {
fields: ['label', 'value'],
data: (function() {
var data = [
{label: '结膜炎', value: '结膜炎'},
{label: '角膜炎', value: '角膜炎'},
{label: '青光眼', value: '青光眼'},
{label: '白内障', value: '白内障'},
{label: '葡萄膜炎', value: '葡萄膜炎'},
{label: '屈光不正', value: '屈光不正'},
{label: '眼部异物', value: '眼部异物'},
{label: '翼状胬肉', value: '翼状胬肉'},
{label: '泪囊炎', value: '泪囊炎'},
{label: '倒睫', value: '倒睫'},
{label: '角膜溃疡', value: '角膜溃疡'},
{label: '角膜白斑', value: '角膜白斑'},
{label: '眼内炎', value: '眼内炎'}
];
return data;
})()
});
... 和组合框,请注意 forceSelection
设置为 false。
{
xtype: 'combobox',
name: 'diagnosis',
fieldLabel: lang["patient.diagnosis"],
labelWidth: 60,
flex:1,
store: diagnosisStore,
valueField: 'value',
displayField: 'label',
typeAhead: true,
queryMode: 'local',
forceSelection: false
}
我还尝试在成功检索 json 响应后在侦听器中运行这行代码:
formPanel.getForm().findField('diagnosis').setValue(rec.data.diagnosis);
但除非我设置的值是商店的一部分,否则它不会填充。那么,为什么用户可以在组合框中输入任何内容,但我不能在代码中使用 setValue 执行相同的操作?对我来说没有意义。
编辑/更新:
有趣的是:即使自定义值未填充/未向用户显示,组合框似乎仍保留自定义值。因为当我调用这一行时:
alert( formPanel.getForm().findField('diagnosis').getValue() );
它实际上会在警报对话框中显示我刚刚尝试通过 setValue() 设置的值。 看来这个组合框组件有点问题。
我刚刚在 ExtJs 中发现这个组合框的另一个问题:还注意到,只有当我输入一个空格(“”)时,组合框中的空白值才会以表单(请求中的 json 参数)的形式提交,然后该字段实际上包含在提交的json参数中。
In ExtJs4, I have a form with a combo box, where the data gets loaded from the database in json via
this.getForm().load({url: '/ext/get-patient', ...
where the user is allowed to enter a custom value besides the predefined ones, configured via the forceSelection
attribute set to false.
The problem I experience is:
when the user selects any of the predefined values from the store in the combo box, saves and reloads the entry again, everything works fine.
But when the user enters a custom value (i.e. "abcde") into the combo box field, saves (and I can see that the entered custom value is stored correctly in the database), and then loads the form data again (correct custom value is in json response), the combo box would then not be populated with this custom value after the loading process.
Why - or how to solve it?
This is the store definition used by the combo box:
// The data store for the diagnoses combobox
var diagnosisStore = Ext.create('Ext.data.Store', {
fields: ['label', 'value'],
data: (function() {
var data = [
{label: '结膜炎', value: '结膜炎'},
{label: '角膜炎', value: '角膜炎'},
{label: '青光眼', value: '青光眼'},
{label: '白内障', value: '白内障'},
{label: '葡萄膜炎', value: '葡萄膜炎'},
{label: '屈光不正', value: '屈光不正'},
{label: '眼部异物', value: '眼部异物'},
{label: '翼状胬肉', value: '翼状胬肉'},
{label: '泪囊炎', value: '泪囊炎'},
{label: '倒睫', value: '倒睫'},
{label: '角膜溃疡', value: '角膜溃疡'},
{label: '角膜白斑', value: '角膜白斑'},
{label: '眼内炎', value: '眼内炎'}
];
return data;
})()
});
... and the combo box, note that forceSelection
is set to false.
{
xtype: 'combobox',
name: 'diagnosis',
fieldLabel: lang["patient.diagnosis"],
labelWidth: 60,
flex:1,
store: diagnosisStore,
valueField: 'value',
displayField: 'label',
typeAhead: true,
queryMode: 'local',
forceSelection: false
}
I also tried to run this line of code, in the listener after the json response has been successfully retrieved:
formPanel.getForm().findField('diagnosis').setValue(rec.data.diagnosis);
but it wouldn't populate unless the value I am settings is part of the store. So, why is it that a user can type anything into the combo box, but I can't do the same with setValue in code? Doesn't make sense to me.
Edit/Update:
The funny thing is: even though the custom value doesn't populate/isn't displayed to the user, it seems that the combo box nevertheless holds the custom value. Because when I call this line:
alert( formPanel.getForm().findField('diagnosis').getValue() );
it would actually show the value, which I've just tried to set via setValue(), in the alert dialog.
Seems that this combo box component is a bit buggy.
Another issue I just found with this combo box in ExtJs: Also noted that blank values in the combo box don't get submitted in the form (json parameter in the request), only if I enter one empty space (" "), then the field is actually included in the submitted json parameters.
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我找到了一个解决方法,尽管我仍然不明白为什么这是必要的:
在成功侦听器中,加载 json 响应后,我将自定义值添加到存储中,然后将组合框设置为这个新添加的值:
不知道为什么在这种情况下当我想使用 setValue 时我需要将自定义值添加到商店,而用户可以通过键盘手动输入任何内容。
I found a workaround, even though I still don't see why this should be necessary:
In the success listener, after the json response is loaded, I add the custom value to the store, then set the combo box to this newly added value:
No idea why I would need to add the custom value to the store in this case when I want to use setValue, while the user can enter anything manually via keyboard.