JavaScript Classic function __ function

JavaScript Classic functions

The client develops the classic JavaScript method,1. String substitution method. function String_replace (srcstring,findstring,replacestring) { Return String_replaceb (srcstring, findstring, replacestring, 0); } function string_replaceb (expression, find, ReplaceWith, start) { var index = Expression.indexof (find, start); if (index = = 1) return expression; var findlen = find.length; var newexp = ""; Newexp = expression.substring (0, index) + (replacewith) + (expression.substring (Index+findlen)); Return String_replaceb (Newexp, Find, ReplaceWith, Index+1+findlen); }2. Fetch string Length method function String_getlength (str) { var i,rt=0; for (i=0;i<str.length;i++) { rt++; if (Str.charcodeat (i) >256) rt++; } return RT; } 3. Method of finding floating points function getfloat (num) { var num = parsefloat (num); if (isNaN (num)) num = 0; return num; } 4. To find an integer method (using floating-point numbers) function getInt (num) { Return parseint (GetFloat (num)); } 5. To determine whether a text field object is empty function At_checkblank (obj,caption) { if (String_replace (Obj.value, "", "") = = "") { Obj.select (); Alert (caption+ "cannot be empty?"); Obj.focus (); return false; } return true; } 6. Two Select objects (llist,rlist) manipulate each other var llist = fmobj.assigneduser;//Left selected item var rlist = Item not selected on the right side of fmobj.waiteduser;// Double-click an item in the right select function Assignuser () { if (Rlist.selectedindex < 0 | | | rlist.selectedindex > Rlist.options.length) return; var i; llist.options.length++; Llist.options[llist.options.length-1].value = Rlist.options[rlist.selectedindex].value; Llist.options[llist.options.length-1].text = Rlist.options[rlist.selectedindex].text; for (i = Rlist.selectedindex I < rlist.options.length-1 i + +) { Rlist.options[i].value = Rlist.options[i+1].value; Rlist.options[i].text = Rlist.options[i+1].text; } Rlist.length--; } Add the right side to the left. function assignright_assignselected () { for (var i = rlist.length-1 i >= 0; I-) { if (rlist.options[i].selected) { llist.options.length++; Llist.options[llist.options.length-1].value = Rlist.options[i].value; Llist.options[llist.options.length-1].text = Rlist.options[i].text; for (var j = i; J < Rlist.options.length-1; J + +) { Rlist.options[j].value = Rlist.options[j+1].value; Rlist.options[j].text = Rlist.options[j+1].text; } Rlist.length--; } } } All right, add to the left. function Assignright_assignall () { for (var i = rlist.length-1 i >= 0; I-) { llist.options.length++; Llist.options[llist.options.length-1].value = Rlist.options[i].value; Llist.options[llist.options.length-1].text = Rlist.options[i].text; for (var j = i; J < Rlist.options.length-1; J + +) { Rlist.options[j].value = Rlist.options[j+1].value; Rlist.options[j].text = Rlist.options[j+1].text; } Rlist.length--; } } Left Select item Double click function Denyuser () { if (Llist.selectedindex < 0 | | | llist.selectedindex > Llist.options.length) return; var i; rlist.options.length++; Rlist.options[rlist.options.length-1].value = Llist.options[llist.selectedindex].value; Rlist.options[rlist.options.length-1].text = Llist.options[llist.selectedindex].text; for (i = Llist.selectedindex I < llist.options.length-1 i + +) { Llist.options[i].value = Llist.options[i+1].value; Llist.options[i].text = Llist.options[i+1].text; } Llist.length--; } Add the item selected on the left to the right function assignright_denyselected () { for (var i = llist.length-1 i >= 0; I-) { if (llist.options[i].selected) { rlist.options.length++; Rlist.options[rlist.options.length-1].value = Llist.options[i].value; Rlist.options[rlist.options.length-1].text = Llist.options[i].text; for (j = Llist.selectedindex J < llist.options.length-1 J + +) { Llist.options[j].value = Llist.options[j+1].value; Llist.options[j].text = Llist.options[j+1].text; } Llist.length--; } } } All items on the left add to the right function Assignright_denyall () { for (var i = llist.length-1 i >= 0; I-) { rlist.options.length++; Rlist.options[rlist.options.length-1].value = Llist.options[i].value; Rlist.options[rlist.options.length-1].text = Llist.options[i].text; for (j = i; J < Llist.options.length-1; J + +) { Llist.options[j].value = Llist.options[j+1].value; Llist.options[j].text = Llist.options[j+1].text; } Llist.length--; } }