问题
I have this problem where I need to add a red asterisk beside a fieldLabel when a field is marked as "required" (or allowBlank: false)
In ExtJS3, we can have this hack easily by overriding Ext.layout.FormLayout as follow:
Ext.override(Ext.layout.FormLayout, {
getTemplateArgs: function(field) {
var noLabelSep = !field.fieldLabel || field.hideLabel;
var labelSep = (typeof field.labelSeparator == 'undefined' ? this.labelSeparator : field.labelSeparator);
if (!field.allowBlank) labelSep += '<span style="color: rgb(255, 0, 0); padding-left: 2px;">*</span>';
return {
id: field.id,
label: field.fieldLabel,
labelStyle: field.labelStyle||this.labelStyle||'',
elementStyle: this.elementStyle||'',
labelSeparator: noLabelSep ? '' : labelSep,
itemCls: (field.itemCls||this.container.itemCls||'') + (field.hideLabel ? ' x-hide-label' : ''),
clearCls: field.clearCls || 'x-form-clear-left'
};
}
});
But this is impossible in ExtJS4. FormLayout is no longer applicable, and labels are in fact rendered by Ext.form.field.Base by using a mixins called Ext.form.Labelable.
Sadly, neither extending the Ext.form.Labelable or overriding Ext.form.Labelable is workable for me. The extended components from Ext.form.field.Base does not receive any effect from it. Even if I swapped the mixins, the templates still would not work.
So here come my solution, where I did a very harsh override over Ext.form.field.Base, and it works as follow (Check out my example)
This is for ExtJS 4.0.7 only. To use it on ExtJS 4.0.2a you need to modify the labelableRenderTpl according to the one found in 4.0.2a /src/form/Labelable.js
(function() {
var overrides = {
labelableRenderTpl: [
'<tpl if="!hideLabel && !(!fieldLabel && hideEmptyLabel)">',
'<label id="{id}-labelEl"<tpl if="inputId"> for="{inputId}"</tpl> class="{labelCls}"',
'<tpl if="labelStyle"> style="{labelStyle}"</tpl>>',
'<tpl if="fieldLabel">{fieldLabel}{labelSeparator}</tpl>',
'<tpl if="!allowBlank"><span style="color:red">*</span></tpl>',
'</label>',
'</tpl>',
'<div class="{baseBodyCls} {fieldBodyCls}" id="{id}-bodyEl" role="presentation">{subTplMarkup}</div>',
'<div id="{id}-errorEl" class="{errorMsgCls}" style="display:none"></div>',
'<div class="{clearCls}" role="presentation"><!-- --></div>',
{
compiled: true,
disableFormats: true
}
],
/**
* @protected
* Generates the arguments for the field decorations {@link #labelableRenderTpl rendering template}.
* @return {Object} The template arguments
*/
getLabelableRenderData: function() {
var me = this,
labelAlign = me.labelAlign,
labelCls = me.labelCls,
labelClsExtra = me.labelClsExtra,
labelPad = me.labelPad,
labelStyle;
// Calculate label styles up front rather than in the Field layout for speed; this
// is safe because label alignment/width/pad are not expected to change.
if (labelAlign === 'top') {
labelStyle = 'margin-bottom:' + labelPad + 'px;';
} else {
labelStyle = 'margin-right:' + labelPad + 'px;';
// Add the width for border-box browsers; will be set by the Field layout for content-box
if (Ext.isBorderBox) {
labelStyle += 'width:' + me.labelWidth + 'px;';
}
}
return Ext.copyTo(
{
inputId: me.getInputId(),
fieldLabel: me.getFieldLabel(),
labelCls: labelClsExtra ? labelCls + ' ' + labelClsExtra : labelCls,
labelStyle: labelStyle + (me.labelStyle || ''),
subTplMarkup: me.getSubTplMarkup(),
allowBlank: me.allowBlank
},
me,
'hideLabel,hideEmptyLabel,fieldBodyCls,baseBodyCls,errorMsgCls,clearCls,labelSeparator',
true
);
}
};
//Both field.Base and FieldContainer are affected, so need to cater for.
Ext.override(Ext.form.field.Base, overrides);
Ext.override(Ext.form.FieldContainer, overrides);
})();
And so I have the nice asterisk added to all the required fields.
Question is, is there any easier way to achieve something like this? Overriding is pretty harsh, best if we can use mixins, but mixins cannot override the behavior
Note
The reason behind this is because I have customized fields that needed to be extended from the base Text, Combo, FieldContainer. Mixins in the extended field doesn't even mess with the template. They are just too stubborn. Perhaps the best way for now is by overriding the Base class... Check out the working example
回答1:
I have a little bit shorter solution. I suggest to use form's 'beforeadd' event like this:
Ext.define('Ext.ux.form', {
extend: 'Ext.form.Panel',
initComponent: function() {
this.on('beforeadd', function(me, field){
if (!field.allowBlank)
field.labelSeparator += '<span style="color: rgb(255, 0, 0); padding-left: 2px;">*</span>';
});
this.callParent(arguments);
}
});
Here is demo
回答2:
You can still override the layout component similar to extjs3 bun given that there is no fieldLayout, I've overriden Ext.layout.Layout. It's quite similar to molecule man's solution but it's more general. Working for fields used in other containers than forms.
Ext.override(Ext.layout.Layout, {
renderItem: function(item, target, position) {
if (item && !item.rendered && item.isFieldLabelable && item.fieldLabel && item.allowBlank == false) {
item.fieldLabel += ' <span class="req" style="color:red">*</span>';
}
this.callOverridden(arguments);
}
});
This is simpler than your solution but not necesarely better, se example also used in fieldsets here
回答3:
You can also override and extend nothing and just create a controller action like so:
Ext.define('MyApp.controller.MyForm', {
extend: 'Ext.app.Controller',
markMandatoryFields: function(field, options) {
if (field && field.isFieldLabelable && field.fieldLabel && field.allowBlank == false) {
field.fieldLabel += ' <span class="req" style="color:red">*</span>';
}
},
init: function() {
this.control({
"field": {
beforerender: this.markMandatoryFields
}
});
}
});
回答4:
For Ext JS 4.1.1 this works:
Ext.define('com.ideas.widgets.Base', {
override : 'Ext.form.field.Base',
initComponent : function()
{
if(this.allowBlank!==undefined && !this.allowBlank)
{
if(!this.labelSeparator)
{
this.labelSeparator = "";
}
this.labelSeparator += '<span style="color:red">*</span>';
}
this.callParent(arguments);
}
});
回答5:
Extjs 4.1
When the field has a fieldLabel use:
fieldLabel: 'Name',
allowBlank: false,
afterLabelTextTpl: "<span style="color:red;font-weight:bold" data-qtip="Required">*</span>"
If the field don't have a fieldLabel use a combination of config options, the hideLabel config must be false:
//hideLabel: false
name: 'lastName',
emptyText: "Last Name",
allowBlank: false,
labelWidth: 0,
fieldLabel: '',
hideEmptyLabel: false,
afterLabelTextTpl: '<span style="color:red;font-weight:bold" data-qtip="Required">*</span>'
Also, you can mix this solution with Drasill plugin an have a easy way to customise all fields at once.
回答6:
An approach that you might find more elegant is adding a css class to any field label that is marked with allowBlank=false and style your mandatory indicator in CSS.
Ext.define('Ext.ux.form', {
extend: 'Ext.form.Panel',
listeners: {
'beforeadd': function(){
if (!field.allowBlank) {
field.labelClsExtra = 'x-required';
}
}
}
});
You can then style your field label in CSS with an :after pseudo utility:
.x-required:after {
content: ' *';
color: red;
font-weight: bold;
}
回答7:
I've made a plugin for this.
Works this ExtJS 4.1 (at least).
Use if like this :
Ext.create('Ext.form.Panel', {
...
plugins : "formlabelrequired"
...
});
Or, to customize the "asterisk":
Ext.create('Ext.form.Panel', {
...
plugins : [{ptype:"formlabelrequired", asterisk:" (mandatory)"}]
...
});
Here is the code for the plugin :
/**
* Plugin (ptype = 'formlabelrequired') that adds "asterisk" to labels
* for Fields with "allowBlank: false".
*/
Ext.define('Ext.ux.plugin.form.LabelRequired', {
extend: 'Ext.AbstractPlugin',
alias: 'plugin.formlabelrequired',
asterisk: ' <span class="required"> *</span>',
constructor: function() {
this.callParent(arguments);
},
init: function(formPanel) {
formPanel.on('beforerender', this.onBeforeRender, this);
},
/**
* @private
* Adds asterisk to labels.
*/
onBeforeRender: function(formPanel) {
var i, len, items;
items = formPanel.query('[allowBlank=false]');
for (i = 0, len = items.length; i < len; i++) {
item = items[i];
item.afterLabelTextTpl = (item.afterLabelTextTpl || "") + this.asterisk;
}
return true;
}
});
回答8:
Actually I think using fieldSubTpl and/or labelableRenderTpl to add the * is a cleaner approach than using the event listener. Events can be stopped, listeners can be detached.
I think OP(Lionel Chan)'s concern was that using Ext.override is kinda hacky and he's 100% right. But if we pass the custom tpl in at the form configuration level it's not that bad:
Ext.create('Ext.form.Panel',{
defaults:{
fieldSubTpl:['<input id="{id}" type="{type}" ',
'<tpl if="name">name="{name}" </tpl>',
'<tpl if="size">size="{size}" </tpl>',
'<tpl if="tabIdx">tabIndex="{tabIdx}" </tpl>',
'class="{fieldCls} {typeCls}" autocomplete="off" />',
'<span>',
'<tpl if="allowBlank==false">*</tpl>',
'</span>',
{
compiled: true,
disableFormats: true
}]},
items : [{
xtype : 'textfield',.....
There could be something wrong with the tpl, i haven't tried.
回答9:
If you don't want to override anything, put the asterisk in the labelSeparator:
{
xtype: 'textfield',
fieldLabel: 'Name',
name: 'requestor_name',
allowBlank: false,
labelSeparator : ': <span style="color:red">*</span>'
}
回答10:
If you want red * to be displayed for a field label we can use fieldlabel which does this.
For example the below code creates new text field with label name "Name" and red asterisk is displayed
var name = new Ext.form.TextField({
fieldLabel : 'Label<span style=\"color:red;\" ext:qtip=\"This field is required\"> *</span>',
name : 'name',
id: 'Name',
maxLength : 40,
width : 205,
allowBlank : false
});
回答11:
Their are so many ways to do this and few of which you can find above, what I am suggesting is:
{
xtype : 'label',
html:'<span>First Name</span><span style="color: rgb(255, 0, 0); padding-left: 2px;">*</span>',
width:50,
}
Simply you can put both asterisk and Label text in single html property.
来源：https://stackoverflow.com/questions/7950375/extjs-4-mark-a-red-asterisk-on-an-required-field