dhtmlx下拉框选项过长，导致显示不全，所以在下拉框里加了title

具体方法如下：

dhtmlXCombo.prototype.modes.checkbox.render=function(c, e) {
if(this.image_css_regexp == null) {
this.image_css_regexp = new RegExp(this.image_css.replace("#state#", "\\d*"))
}
c._conf = {
value: e.value,
css: "",
checked: window.dhx4.s2b(e.checked)
};
c.className = "dhxcombo_option";
var a = {};
if(e.multicol == true) {
e.text.checkbox = "<div class=‘" + String(this.image_css).replace("#state#", (c._conf.checked ? "1" : "0")) + "‘></div>&nbsp;";
a.checkbox = true;
c.innerHTML = "<div class=‘" + dhtmlXCombo.prototype.modes.option.option_css + "‘ title=‘"+ e.text + "‘></div>"
} else {
c.innerHTML = "<div class=‘" + String(this.image_css).replace("#state#", (c._conf.checked ? "1" : "0")) + "‘></div><div class=‘" + this.option_css + "‘ title=‘"+ e.text + "‘>&nbsp;</div>"
}
if(e.css != null) {
c.lastChild.style.cssText += e.css;
c._conf.css = e.css
}
this.setText(c, e.text, a);
return this
};

dhtmlXCombo.prototype.modes.option.render=function(a, c) {
a._conf = {
value: c.value,
css: ""
};
a.className = "dhxcombo_option";
a.innerHTML = "<div class=‘" + this.option_css + "‘ title=‘"+ c.text + "‘ >&nbsp;</div>";
if(c.css != null) {
a.lastChild.style.cssText = c.css;
a._conf.css = c.css
}
this.setText(a, c.text);
return this
}

编译出来的HTML代码加入的div里加入title属性

a.innerHTML = "<div class=‘" + this.option_css + "‘ title=‘"+ c.text + "‘ >&nbsp;</div>";

DHTMLX 修改方法加参数