Ext Textfield框必填项 *号

方法1:在items中加*号

var shortName = new Ext.form.TextField({
			fieldLabel : '客户简称',
			name : 'shortName',
			allowBlank : false,
			blankText : '客户简称不能为空',
			width : 100
		});
var formPanel = new Ext.form.FormPanel({
	layout : 'table',
	layoutConfig : {
		columns : 3
	},
	items : [{
		layout : 'form',
		items : [{
			layout : 'table',
			items : [{
						layout : 'form',
						items : [shortName]
					}, {
						html : '<font id="noFont" class="x-form-item" style="padding-left:1px" color="red">*</font>'
					}]
		}]
	}]
})

方法2:覆写onRender方法并添加个sideText属性，并定义样式x-form-sideText

/**
 * 适用于TextField、NumberField(转自互联网)
 */
Ext.override(Ext.form.TextField, {
			sideText : '',
			onRender : function(ct, position) {
				Ext.form.TextField.superclass.onRender.call(this, ct, position);
				if (this.sideText != '' && !this.triggerAction) {
					this.sideEl = ct.createChild({
								tag : 'div',
								html : this.sideText
							});
					this.sideEl.addClass('x-form-sideText');
				}
			}
		});
/**
 * 适用于ComboBox
 */
Ext.override(Ext.form.ComboBox, {
			sideText : '',
			onRender : function(ct, position) {
				Ext.form.ComboBox.superclass.onRender.call(this, ct, position);
				if (this.sideText != '') {
					this.sideEl = ct.first('div').createChild({
								tag : 'div',
								style : 'padding-left: 19px; ',
								html : this.sideText
							});
					this.sideEl.addClass('x-form-sideText');
				}
				if (this.hiddenName) {
					this.hiddenField = this.el.insertSibling({
								tag : 'input',
								type : 'hidden',
								name : this.hiddenName,
								id : (this.hiddenId || this.hiddenName)
							}, 'before', true);

					// prevent input submission
					this.el.dom.removeAttribute('name');
				}
				if (Ext.isGecko) {
					this.el.dom.setAttribute('autocomplete', 'off');
				}

				if (!this.lazyInit) {
					this.initList();
				} else {
					this.on('focus', this.initList, this, {
								single : true
							});
				}
			}
		});

定义style:

<style>
        .x-form-sideText {   
            padding-left: 2px;   
            display: inline-block;   
            display: inline;
        }  
</style>

示例:

var shortName = new Ext.form.TextField({
			fieldLabel : '客户简称',
			name : 'shortName',
			allowBlank : false,
			blankText : '客户简称不能为空',
			sideText : '<font color=red>*</font>',
			width : 100
		});

方法3：

{
          fieldLabel: '用户名',
          xtype: 'textfield',
          name: 'userName',
          width:200,
          id: 'userName',
          listeners : {   
			 render:function(config){  
			 $("#"+config.id).after("<font id='font_"+config.id+"' color='red' > *</font>");
			 $("#font_"+config.id).after("<span id='span_"+config.id+"' style='color:red;'></span>");
			 }
		 }
      }

,

{
          fieldLabel: '用户名',
          xtype: 'textfield',
          name: 'u2',
          xtype:'trigger',
          triggerClass:'x-form-search-trigger',
          cls:'ux-readOnly',
          width:200,
          id: 'u2',
           listeners : {   
			 render:function(config){  
			    $("#"+config.id+" + img").after("<font id='font_"+config.id+"' color='red' style='padding-left:16px;'> *</font>");
			    $("#font_"+config.id).after("<span id='span_"+config.id+"' style='color:red;'></span>");
    
			 }
		 }
}